Propeller Datasheet Version 1.2 Propellerdatasheet V12

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Propeller™ P8X32A Datasheet
8-Cog Multiprocessor Microcontroller
1.0

PRODUCT OVERVIEW

1.1.

Introduction

The Propeller chip is designed to provide high-speed processing for embedded systems while maintaining low current
consumption and a small physical footprint. In addition to being fast, the Propeller chip provides flexibility and power
through its eight processors, called cogs, that can perform simultaneous tasks independently or cooperatively, all while
maintaining a relatively simple architecture that is easy to learn and utilize. Two programming languages are available: Spin
(a high-level object-based language) and Propeller Assembly. Both include custom commands to easily manage the
Propeller chip’s unique features.
Figure 1: Propeller P8X32A Block Diagram

1.2.

Stock Codes
Table 1: Propeller Chip Stock Codes

Device
Stock #
P8X32A-D40

Package Type

I/O
Pins

Power
Requirements

External
Clock
Speed

Internal RC
Oscillator

Internal
Execution
Speed

Global
ROM/RAM

Cog RAM

3.3 volts DC

DC to 80
MHz

12 MHz or
20 kHz*

0 to 160 MIPS
(20 MIPS/cog)

64 K bytes;
32768 bytes
ROM / 32768
bytes RAM

512 x 32 bits
per cog

40-pin DIP

P8X32A-Q44

44-pin LQFP

P8X32A-M44

44-pin QFN

32
CMOS

*Approximate; may range from 8 MHz – 20 MHz, or 13 kHz – 33 kHz, respectively.
Parallax, Propeller, Spin, and the Parallax and Propeller logos are trademarks of Parallax, Inc. All other trademarks are the property of their respective holders.
Copyright © Parallax Inc.
Page 1 of 37
Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

www.parallax.com

Table of Contents
1.0

Product Overview......................................................... 1

1.1.
1.2.
1.3.
1.4.
1.5.
1.6.
1.7.

Introduction ................................................................................1
Stock Codes...............................................................................1
Key Features..............................................................................3
Programming Advantages..........................................................3
Applications................................................................................3
Programming Platform Support..................................................3
Corporate and Community Support............................................3

2.0

Connection Diagrams .................................................. 4

2.1.
2.2.
2.3.

Pin Assignments ........................................................................4
Pin Descriptions .........................................................................4
Typical Connection Diagrams ....................................................5

2.3.1.
2.3.2.

Propeller Clip or Propeller Plug Connection - Recommended...............5
Alternative Serial Port Connection.........................................................5

3.0

Operating Procedures ................................................. 6

3.1.
3.2.
3.3.

Boot-Up Procedure ....................................................................6
Run-Time Procedure..................................................................6
Shutdown Procedure..................................................................6

4.0

System Organization ................................................... 6

4.1.
4.2.
4.3.
4.4.
4.5.
4.6.
4.7.
4.8.
4.9.

Shared Resources .....................................................................6
System Clock .............................................................................6
Cogs (processors)......................................................................7
Hub ............................................................................................7
I/O Pins ......................................................................................8
System Counter .........................................................................8
Locks .........................................................................................8
Assembly Instruction Execution Stages .....................................9
Cog Counters...........................................................................10

4.9.1.
4.9.2.
4.9.3.

4.10.
4.10.1.
4.10.2.
4.10.3.

CTRA / CTRB – Control register .........................................................10
FRQA / FRQB – Frequency register....................................................10
PHSA / PHSB – Phase register...........................................................10

Video Generator.......................................................................11
VCFG – Video Configuration Register.................................................11
VSCL – Video Scale Register..............................................................12
WAITVID Command/Instruction ..........................................................12

5.2.

Cog RAM................................................................................. 16

6.0

Programming Languages ..........................................17

6.1.

Reserved Word List ................................................................. 17

6.1.1.

6.2.
6.3.
6.3.1.

6.4.
6.4.1.
6.4.2.
6.4.3.
6.4.4.

Words Reserved for Future Use ......................................................... 17

Math and Logic Operators ....................................................... 18
Spin Language Summary Table .............................................. 19
Constants ........................................................................................... 21

Propeller Assembly Instruction Table....................................... 22
Assembly Conditions .......................................................................... 24
Assembly Directives ........................................................................... 24
Assembly Effects ................................................................................ 24
Assembly Operators ........................................................................... 24

7.0

Propeller Demo Board Schematic.............................25

8.0

Electrical Characteristics...........................................26

8.1.
8.2.
8.3.

Absolute Maximum Ratings ..................................................... 26
DC Characteristics................................................................... 26
AC Characteristics ................................................................... 26

9.0

Current Consumption Characteristics .....................27

9.1.
9.2.
9.3.
9.4.
9.5.
9.6.

Typical Current Consumption of 8 Cogs .................................. 27
Typical Current of a Cog vs. Operating Frequency .................. 28
Typical PLL Current vs. VCO Frequency ................................. 28
Typical Crystal Drive Current ................................................... 29
Cog and I/O Pin Relationship................................................... 29
Current Profile at Various Startup Conditions .......................... 30

10.0

Temperature Characteristics.....................................31

10.1.
10.2.
10.3.

Internal Oscillator Frequency as a Function of Temperature.... 31
Fastest Operating Frequency as a Function of Temperature ... 32
Current Consumption as a Function of Temperature ............... 33

11.0

Package Dimensions..................................................34

11.1.
11.2.
11.3.

P8X32A-D40 (40-pin DIP)........................................................ 34
P8X32A-Q44 (44-pin LQFP) .................................................... 35
P8X32A-M44 (44-pin QFN)...................................................... 36

4.11.

CLK Register............................................................................14

12.0

Manufacturing Info .....................................................37

5.0

Memory Organization ................................................ 15

5.1.

Main Memory ...........................................................................15

12.1.
12.2.

Reflow Peak Temperature ....................................................... 37
Green/RoHS Compliance ........................................................ 37

13.0

Revision History .........................................................37

5.1.1.
5.1.2.
5.1.3.
5.1.4.

Main RAM............................................................................................15
Main ROM ...........................................................................................15
Character Definitions...........................................................................15
Math Function Tables..........................................................................16

Page 2 of 37

13.1.1.
13.1.2.

Changes for Version 1.1: .................................................................... 37
Changes for Version 1.2: .................................................................... 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

1.3.

www.parallax.com

Programming Platform Support

Key Features

The design of the Propeller chip frees application
developers from common complexities of embedded
systems programming. For example:

Parallax Inc. supports the Propeller chip with a variety of
hardware tools and boards:
• Propeller Clip (#32200) and Propeller Plug
(#32201). These boards provide convenient
programming port connections, see the Typical
Connection Diagrams on Page 5.
• The Propeller Demo Board (#32100) provides a
convenient means to test-drive the Propeller chip's
varied capabilities through a host of device
interfaces on one compact board. The schematic is
provided on page 25. Main features:
o P8X32A-Q44 Propeller Chip
o 24LC256-I/ST EEPROM for program storage
o Replaceable 5.000 MHz crystal
o 3.3 V and 5 V regulators with on/off switch
o USB-to-serial interface for programming and
communication
o VGA and TV output
o Stereo output with 16 Ω headphone amplifier
o Electret microphone input
o Two PS/2 mouse and keyboard I/O connectors
o 8 LEDs (share VGA pins)
o Pushbutton for reset
o Big ground post for scope hookup
o I/O pins P0-P7 are free and brought out to header
o Breadboard for custom circuits
• The Propeller Proto Board (#32212) features a
surface-mount Propeller chip with the necessary
components to achieve a programming interface,
with pads ready for a variety of I/O connectors and
DIP/SIP chips, and a generous through-hole
prototyping area.
• The PropStick USB (#32210) features a Propeller
chip, EEPROM, 3.3 VDC and 5 VDC regulators,
reset button, crystal and USB connection on a 0.6”
wide DIP package for easy prototyping on perfboard
and breadboard.

• Eight processors (cogs) perform simultaneous
processes independently or cooperatively, sharing
common resources through a central hub. The
Propeller application designer has full control over
how and when each cog is employed; there is no
compiler-driven or operating system-driven splitting
of tasks among multiple cogs.
This method
empowers the developer to deliver absolutely
deterministic timing, power consumption, and
response to the embedded application.
• Asynchronous events are easier to handle than with
devices that use interrupts. The Propeller has no
need for interrupts; just assign some cogs to
individual, high-bandwidth tasks and keep other
cogs free and unencumbered. The result is a more
responsive application that is easier to maintain.
• A shared System Clock allows each cog to maintain
the same time reference, allowing true synchronous
execution.

1.4.

Programming Advantages

• The object-based high-level Spin language is easy to
learn, with special commands that allow developers
to quickly exploit the Propeller chip’s unique and
powerful features.
• Propeller Assembly instructions provide conditional
execution and optional flag and result writing for
each individual instruction. This makes critical,
multi-decision blocks of code more consistently
timed; event handlers are less prone to jitter and
developers spend less time padding, or squeezing,
cycles.

1.5.

Applications

The Propeller chip is particularly useful in projects that
can be vastly simplified with simultaneous processing,
including:

1.7.

• Industrial control systems
• Sensor integration, signal processing, and data
acquisition
• Handheld portable human-interface terminals
• Motor and actuator control
• User interfaces requiring NTSC, PAL, or VGA
output, with PS/2 keyboard and mouse input
• Low-cost video game systems
• Industrial, educational or personal-use robotics
• Wireless video transmission (NTSC or PAL)

Corporate and Community Support

• Parallax provides technical support free of charge.
In the Continental US, call toll free (888) 512-1024;
from outside please call (916) 624-8333. Or, email:
support@parallax.com.
• Parallax hosts a moderated public user’s forum just
for the Propeller: http://forums.parallax.com/forums.
• Browse through community-created Propeller
objects and share yours with others via Parallaxhosted Propeller Object Exchange Library:
http://obex.parallax.com.

1.6.

Page 3 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

www.parallax.com

2.0

CONNECTION DIAGRAMS

2.1.

Pin Assignments

LQFP and QFN Packages
DIP Package

2.2.

Pin Descriptions
Table 2: Pin Descriptions

Pin Name

Direction

Description
General purpose I/O Port A. Can source/sink 40 mA each at 3.3 VDC. CMOS level logic with threshold
of ≈ ½ VDD or 1.6 VDC @ 3.3 VDC.
The pins shown below have a special purpose upon power-up/reset but are general purpose I/O
afterwards.
P28 - I2C SCL connection to optional, external EEPROM.
P29 - I2C SDA connection to optional, external EEPROM.
P30 - Serial Tx to host.
P31 - Serial Rx from host.

P0 – P31

I/O

VDD

---

3.3 volt power (2.7 – 3.6 VDC)

VSS

---

Ground

BOEn

Brown Out Enable (active low). Must be connected to either VDD or VSS. If low, RESn becomes a
weak output (delivering VDD through 5 kΩ) for monitoring purposes but can still be driven low to cause
reset. If high, RESn is CMOS input with Schmitt Trigger.

RESn

I/O

Reset (active low). When low, resets the Propeller chip: all cogs disabled and I/O pins floating.
Propeller restarts 50 ms after RESn transitions from low to high.

Crystal Input. Can be connected to output of crystal/oscillator pack (with XO left disconnected), or to
one leg of crystal (with XO connected to other leg of crystal or resonator) depending on CLK Register
settings. No external resistors or capacitors are required.

Crystal Output. Provides feedback for an external crystal, or may be left disconnected depending on
CLK Register settings. No external resistors or capacitors are required.

Page 4 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

2.3.

www.parallax.com

Typical Connection Diagrams

2.3.1. Propeller Clip or Propeller Plug Connection - Recommended
Note that the connections to the external oscillator and EEPROM, which are enclosed in dashed lines, are optional.
Propeller Clip, Stock #32200; Propeller Plug, Stock #32201. The Propeller Clip/Plug schematic is available for download
from www.parallax.com.

2.3.2.

Alternative Serial Port Connection

Page 5 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

3.0

OPERATING PROCEDURES

3.1.

Boot-Up Procedure

www.parallax.com

Upon power-up, or reset:
1. The Propeller chip’s internal RC oscillator begins
running at 20 kHz, then after a 50 ms reset delay,
switches to 12 MHz. Then the first processor (Cog 0)
loads and runs the built-in Boot Loader program.
2. The Boot Loader performs one or more of the
following tasks, in order:
a. Detects communication from a host, such as a
PC, on pins P30 and P31. If communication
from a host is detected, the Boot Loader
converses with the host to identify the Propeller
chip and possibly download a program into
global RAM and optionally into an external 32
KB EEPROM.
b. If no host communication was detected, the Boot
Loader looks for an external 32 KB EEPROM on
pins P28 and P29. If an EEPROM is detected,
the entire 32 KB data image is loaded into the
Propeller chip’s global RAM.
c. If no EEPROM was detected, the boot loader
stops, Cog 0 is terminated, the Propeller chip
goes into shutdown mode, and all I/O pins are set
to inputs.
3. If either step 2a or 2b was successful in loading a
program into the global RAM, and a suspend
command was not given by the host, then Cog 0 is
reloaded with the built-in Spin Interpreter and the
user code is run from global RAM.

3.2.

Run-Time Procedure

A Propeller Application is a user program compiled into
its binary form and downloaded to the Propeller chip’s
RAM or external EEPROM. The application consists of
code written in the Propeller chip’s Spin language (highlevel code) with optional Propeller Assembly language
components (low-level code). Code written in the Spin
language is interpreted during run time by a cog running
the Spin Interpreter while code written in Propeller
Assembly is run in its pure form directly by a cog. Every
Propeller Application consists of at least a little Spin code
and may actually be written entirely in Spin or with
various amounts of Spin and assembly. The Propeller
chip’s Spin Interpreter is started in Step 3 of the Boot Up
Procedure, above, to get the application running.
Once the boot-up procedure is complete and an
application is running in Cog 0, all further activity is
defined by the application itself. The application has
complete control over things like the internal clock speed,

I/O pin usage, configuration registers, and when, what
and how many cogs are running at any given time. All of
this is variable at run time, as controlled by the
application.

3.3.

Shutdown Procedure

When the Propeller goes into shutdown mode, the internal
clock is stopped causing all cogs to halt and all I/O pins
are set to input direction (high impedance). Shutdown
mode is triggered by one of the three following events:
1. VDD falling below the brown-out threshold (~2.7
VDC), when the brown out circuit is enabled,
2. the RESn pin going low, or
3. the application requests a reboot (see the REBOOT
command in the Propeller Manual).
Shutdown mode is discontinued when the voltage level
rises above the brown-out threshold and the RESn pin is
high.

4.0

SYSTEM ORGANIZATION

4.1.

Shared Resources

There are two types of shared resources in the Propeller:
1) common, and 2) mutually-exclusive.
Common
resources can be accessed at any time by any number of
cogs. Mutually-exclusive resources can also be accessed
by any number of cogs, but only by one cog at a time.
The common resources are the I/O pins and the System
Counter. All other shared resources are mutuallyexclusive by nature and access to them is controlled by
the Hub. See Section 4.4 on page 7.

4.2.

System Clock

The System Clock (shown as “CLOCK” in Figure 1, page
1) is the central clock source for nearly every component
of the Propeller chip. The System Clock’s signal comes
from one of three possible sources:
• The internal RC oscillator (~12 MHz or ~20 kHz)
• The XI input pin (either functioning as a highimpedance input or a crystal oscillator in
conjunction with the XO pin)
• The Clock PLL (phase-locked loop) fed by the XI
input
The source is determined by the CLK register’s settings,
which is selectable at compile time and reselectable at run
time. The Hub and internal Bus operate at half the
System Clock speed.

Page 6 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

4.3.

www.parallax.com

Cogs (processors)

The Propeller contains eight (8) identical, independent
processors, called cogs, numbered 0 to 7. Each cog
contains a Processor block, local 2 KB RAM configured
as 512 longs (512 x 32 bits), two advanced counter
modules with PLLs, a Video Generator, I/O Output
Register, I/O Direction Register, and other registers not
shown in the Block Diagram.
All eight cogs are driven from the System Clock; they
each maintain the same time reference and all active cogs
execute instructions simultaneously. They also all have
access to the same shared resources.
Cogs can be started and stopped at run time and can be
programmed to perform tasks simultaneously, either
independently or with coordination from other cogs
through Main RAM. Each cog has its own RAM, called
Cog RAM, which contains 512 registers of 32 bits each.
The Cog RAM is all general purpose RAM except for the
last 16 registers, which are special purpose registers, as
described in Table 15 on page 16.

4.4.

Hub

To maintain system integrity, mutually-exclusive
resources must not be accessed by more than one cog at a
time. The Hub controls access to mutually-exclusive
resources by giving each cog a turn in a “round robin”
fashion from Cog 0 through Cog 7 and back to Cog 0
again. The Hub and its bus run at half the System Clock
rate, giving a cog access to mutually-exclusive resources
once every 16 System Clock cycles. Hub instructions, the
Propeller Assembly instructions that access mutuallyexclusive resources, require 7 cycles to execute but they
first need to be synchronized to the start of the Hub
Access Window.

It takes up to 15 cycles (16 minus 1, if we just missed it)
to synchronize to the Hub Access Window plus 7 cycles
to execute the hub instruction, so hub instructions take
from 7 to 22 cycles to complete.
Figure 2 and Figure 3 show examples where Cog 0 has a
hub instruction to execute. Figure 2 shows the best-case
scenario; the hub instruction was ready right at the start of
that cog’s access window. The hub instruction executes
immediately (7 cycles) leaving an additional 9 cycles for
other instructions before the next Hub Access Window
arrives.
Figure 3 shows the worst-case scenario; the hub
instruction was ready on the cycle right after the start of
Cog 0’s access window; it just barely missed it. The cog
waits until the next Hub Access Window (15 cycles later)
then the hub instruction executes (7 cycles) for a total of
22 cycles for that hub instruction. Again, there are 9
additional cycles after the hub instruction for other
instructions to execute before the next Hub Access
Window arrives. To get the most efficiency out of
Propeller Assembly routines that have to frequently
access mutually-exclusive resources, it can be beneficial
to interleave non-hub instructions with hub instructions to
lessen the number of cycles waiting for the next Hub
Access Window.
Since most Propeller Assembly
instructions take 4 clock cycles, two such instructions can
be executed in between otherwise contiguous hub
instructions.
Keep in mind that a particular cog’s hub instructions do
not, in any way, interfere with other cogs’ instructions
because of the Hub mechanism. Cog 1, for example, may
start a hub instruction during System Clock cycle 2, in
both of these examples, possibly overlapping its execution
with that of Cog 0 without any ill effects. Meanwhile, all
other cogs can continue executing non-hub instructions,
or awaiting their individual hub access windows
regardless of what the others are doing.

Figure 2: Cog-Hub
Interaction – Best Case
Scenario

Figure 3: Cog-Hub
Interaction – Worst Case
Scenario

Page 7 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

4.5.

www.parallax.com

I/O Pins

The Propeller has 32 I/O pins, 28 of which are general
purpose. I/O Pins 28 - 31 have a special purpose at boot
up and are available for general purpose use afterwards;
see section 2.2, page 4. After boot up, any I/O pins can
be used by any cogs at any time. It is up to the
application developer to ensure that no two cogs try to use
the same I/O pin for different purposes during run time.
Refer to Figure 1, page 1. Each cog has its own 32-bit I/O
Direction Register and 32-bit I/O Output Register to
influence the states of the Propeller chip’s corresponding
32 I/O pins. A cog's desired I/O directions and output
states is communicated through the entire cog collective
to become "Pin Directions" and "Pin Outputs."
Pin Directions are the result of OR'ing the Direction
Registers of the cogs together. Pin Outputs are the result
of OR'ing the output states of the cogs together. A cog's
output state consists of the bits of its I/O modules (the
Counters, the Video Generator, and the I/O Output
Register) OR'd together then AND'd with the bits of its
Direction Register.
All cogs can still access and influence the I/O pins

simultaneously, without electrical contention, as
described by these rules:
A. A pin is an input only if no active cog sets it to
an output.
B. A pin outputs low only if all active cogs that set
it to output also set it to low.
C. A pin outputs high if any active cog sets it to an
output and also sets it high.
Table 3 demonstrates a few possible combinations of the
collective cogs’ influence on a particular I/O pin, P12 in
this example. For simplification, these examples assume
that bit 12 of each cog’s I/O hardware, other than its I/O
Output Register, is cleared to zero (0).
Any cog that is shut down has its Direction Register and
output states cleared to zero, effectively removing it from
influencing the final state of the I/O pins that the
remaining active cogs are controlling.
Each cog also has its own 32-bit Input Register. This
input register is really a pseudo-register; every time it is
read, the actual states of the I/O pins are read, regardless
of their input or output direction.

Table 3: I/O Sharing Examples
Bit 12 of Cogs’ I/O Direction Register

Bit 12 of Cogs’ I/O Output Register

Cog ID

State of
I/O Pin P12

Example 1

0 0

Input

Example 2

0 0

Output Low

Example 3

0 0

Output High

Example 4

0 0

Output Low

Example 5

0 0

Output High

Example 6

1 1

0 0

Output High

Example 7

1 1

0 0

Output High

Output Low

Example 8

1 1

0 0

Rule
Followed

Note: For the I/O Direction Register, a 1 in a bit location sets the corresponding I/O pin to the output direction; a 0 sets it to an input direction.

4.6.

System Counter

4.7.

The System Counter is a global, read-only, 32-bit counter
that increments once every System Clock cycle. Cogs can
read the System Counter (via their CNT registers, see
Table 15 on page 16) to perform timing calculations and
can use the WAITCNT command (see section 6.3 on page
19 and section 6.4 on page 22) to create effective delays
within their processes. The System Counter is a common
resource which every cog can read simultaneously. The
System Counter is not cleared upon startup since its
practical use is for differential timing. If a cog needs to
keep track of time from a specific, fixed moment in time,
it simply needs to read and save the initial counter value
at that moment in time, and compare subsequent counter
values against that initial value.

Locks

There are eight lock bits (semaphores) available to
facilitate exclusive access to user-defined resources
among multiple cogs. If a block of memory is to be used
by two or more cogs at once and that block consists of
more than one long (four bytes), the cogs will each have
to perform multiple reads and writes to retrieve or update
that memory block. This leads to the likely possibility of
read/write contention on that memory block where one
cog may be writing while another is reading, resulting in
misreads and/or miswrites.
The locks are global bits accessed through the Hub via
LOCKNEW, LOCKRET, LOCKSET, and LOCKCLR. Because
locks are accessed only through the Hub, only one cog at
a time can affect them, making this an effective control
mechanism. The Hub maintains an inventory of which
locks are in use and their current states; cogs can check
out, return, set, and clear locks as needed during run time.

Page 8 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

4.8.

www.parallax.com

Assembly Instruction Execution Stages

Figure 4: Assembly Instruction Execution Stages
Stage

(Execute N- 1)
Fetch
Instruction
N

Write
Result
N-1

Fetch
Source
N

Fetch
Destination
N

(Execute N)
Fetch
Instruction
N+1

Write
Result
N

M+1

M+2

M+3

M+4

M+5

clock cycle

The Propeller executes assembly instructions in five
stages. While an entire instruction takes six cycles to
execute, two of those clock cycles are dedicated to the
two adjacent instructions. This results in an overall
throughput of four clock cycles per instruction.

Figure 5
Cog Memory

Instruction N-1
Instruction N

Program
counter

Instruction N+1

In Stage 1, instruction N, pointed to by the Program
Counter, is fetched from cog memory during clock cycle
M. During cycle M+1 the result from the previous
instruction is written to memory. The reason the previous
instruction result is written after the current instruction is
fetched will be explained shortly.
During Stage 2, if the immediate flag of Instruction N is
set, the 9 bit source field is saved as the source value. If
the value is not immediate, the location specified by the
source field is fetched from cog memory during clock
cycle M+2. During clock cycle M+3 the location
specified in the destination field is fetched from cog
memory (Stage 3).
At this point in time (Stage 4) the Arithmetic Logic Unit
(ALU) has all the information needed to execute the
instruction. Executing the instruction takes some amount
of time before the result is available. The amount of time
required for execution is dictated by the slowest operation
the ALU performs. To provide enough time for the ALU
to execute the instruction, a full clock cycle (M+4) is
provided to the ALU for the result to settle into its final
state. During this execution, the cog memory is not

accessed by instruction N. To speed up the throughput of
program execution, the next instruction to be executed is
fetched from cog memory while the current instruction is
executed in the ALU.
Finally at clock cycle M+5 the result of the current
instruction N is written back to cog memory, completing
Stage 5.
The partial interleaving of instructions has a couple
implications to program flow. First, when code
modification occurs through MOVI, MOVS, MOVD or any
operations which modifies an assembly instruction, there
must be at least one instruction executed before the
modified instruction is executed. If the modification is
done on the immediately following instruction (N+1), the
unmodified version of instruction N+1 will be loaded a
clock cycle before the modified version of instruction
N+1 is written to cog memory.
Second, conditional jumps do not know for certain if they
will jump until the end of clock cycle M+4. Since the next
instruction has already been fetched, only one of the two
possible branches can be predicted. In the Propeller,
conditional branches are always predicted to take the
jump. For loops using DJNZ where the jump is taken every
time except the final loop, a tighter execution time of the
loop is achieved.
In the event the jump is not taken, the cog takes no action
until the next instruction is fetched. This is equivalent to a
NOP being inserted before the next instruction is executed.
Unconditional jumps always take four clock cycles to
execute since the Propeller can always accurately predict
what address needs to be loaded into the Program Counter
for the next instruction to execute. Examples of
unconditional jumps include JMP, JMPRET, CALL and RET.
If an instruction needs to access any Hub resource, Stage
4 is extended until the Hub becomes available, increasing
execution time to at least 7 and potentially up to 22 clock
cycles. See Section 4.4: Hub on page 7.

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4.9.

www.parallax.com

Cog Counters

Each cog has two counter modules: CTRA and CTRB. Each
counter module can control or monitor up to two I/O pins
and perform conditional 32-bit accumulation of its FRQ
register into its PHS register on every clock cycle.
Each counter module also has its own phase-locked loop
(PLL) which can be used to synthesize frequencies up to
128 MHz.
With a little setup or oversight from the cog, a counter can
be used for:
•
•
•
•
•
•
•
•
•

frequency synthesis
frequency measurement
pulse counting
pulse measurement
multi-pin state measurement
pulse-width modulation
duty-cycle measurement
digital-to-analog conversion
analog-to-digital conversion

For some of these operations, the cog can be set up and
left in a free-running mode. For others, it may use
WAITCNT to time-align counter reads and writes within a
loop, creating the effect of a more complex state machine.
Note that for a cog clock frequency of 80 MHz, the
counter update period is a mere 12.5 ns. This high speed,
combined with 32-bit precision, allows for very dynamic
signal generation and measurement.
The design goal for the counter was to create a simple and
flexible subsystem which could perform some repetitive
task on every clock cycle, thereby freeing the cog to
perform some computationally richer super-task. While
the counters have only 32 basic operating modes, there is
no limit to how they might be used dynamically through
software. Integral to this concept is the use of the
WAITPEQ, WAITPNE, and WAITCNT instructions, which can
event-align or time-align a cog with its counters.
Each counter has three registers:
4.9.1. CTRA / CTRB – Control register
The CTR (CTRA and CTRB) register selects the counter's
operating mode. As soon as this register is written, the
new operating mode goes into effect. Writing a zero to
CTR will immediately disable the counter, stopping all
pin output and PHS accumulation.
Table 4: CTRA and CTRB Registers
31
-

30..26

25..23

CTRMODE PLLDIV

22..15

14..9

8..6

5..0

BPIN

APIN

The CTRMODE field selects one of 32 operating modes
for the counter, conveniently written (along with
PLLDIV) using the MOVI instruction. These modes of
operation are listed in Table 6 on page 11.
Table 5: PLLDIV Field
PLLDIV %000 %001 %010 %011 %100 %101 %110 %111
Output

VCO
128

VCO VCO VCO VCO VCO VCO VCO
32
16
8
64
4
2
1

PLLDIV selects a PLL output tap and may be ignored if
not used.
The PLL modes (%00001 to %00011) cause FRQ-to-PHS
accumulation to occur every clock cycle. This creates a
numerically-controlled oscillator (NCO) in PHS[31],
which feeds the counter PLL's reference input. The PLL
will multiply this frequency by 16 using its voltagecontrolled oscillator (VCO). For stable operation, it is
recommended that the VCO frequency be kept within 64
MHz to 128 MHz. This translates to an NCO frequency of
4 MHz to 8 MHz.
The PLLDIV field of the CTR register selects which
power-of-two division of the VCO frequency will be used
as the final PLL output. This affords a PLL range of 500
kHz to 128 MHz.
BPIN selects a pin to be the secondary I/O. It may be
ignored if not used and may be written using the MOVD
instruction.
APIN selects a pin to be the primary I/O. It may be
ignored if not used and may be written using the MOVS
instruction.
4.9.2. FRQA / FRQB – Frequency register
FRQ (FRQA and FRQB) holds the value that will be
accumulated into the PHS register. For some applications,
FRQ may be written once, and then ignored. For others, it
may be rapidly modulated.
4.9.3. PHSA / PHSB – Phase register
The PHS (PHSA and PHSB) register can be written and
read via cog instructions, but it also functions as a freerunning accumulator, summing the FRQ register into
itself on potentially every clock cycle. Any instruction
writing to PHS will override any accumulation for that
clock cycle. PHS can only be read through the source
operand (same as PAR, CNT, INA, and INB). Beware
that doing a read-modify-write instruction on PHS, like
"ADD PHSA, #1", will cause the last-written value to be
used as the destination operand input, rather than the
current accumulation.

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Table 6: Counter Modes (CTRMODE Field Values)
CTRMODE

Accumulate
FRQx to PHSx

Description

APIN
Output*

BPIN
Output*

%00000

Counter disabled (off)

0 (never)

0 (none)

%00001
%00010
%00011

PLL internal (video mode)
PLL single-ended
PLL differential

1 (always)
1
1

0
PLLx
PLLx

0
0
!PLLx

%00100
%00101

NCO single-ended
NCO differential

1
1

PHSx[31]
PHSx[31]

0
!PHSx[31]

%00110
%00111

DUTY single-ended
DUTY differential

1
1

PHSx-Carry
PHSx-Carry

0
!PHSx-Carry

%01000
%01001
%01010
%01011

POS detector
POS detector with feedback
POSEDGE detector
POSEDGE detector w/ feedback

A
1
A
1
2
A & !A
1
2
A & !A

0
0
0
0

0
!A1
0
!A1

%01100
%01101
%01110
%01111

NEG detector
NEG detector with feedback
NEGEDGE detector
NEGEDGE detector w/ feedback

!A
1
!A
1
2
!A & A
1
2
!A & A

0
0
0
0

0
!A1
0
!A1

0
LOGIC never
0
%10000
0
!A1 & !B1
LOGIC !A & !B
0
%10001
0
1
1
LOGIC A & !B
0
%10010
0
A & !B
1
LOGIC !B
0
%10011
!B
0
1
1
LOGIC !A & B
0
%10100
0
!A & B
1
LOGIC !A
0
%10101
0
!A
1
1
LOGIC A <> B
0
%10110
0
A <> B
1
1
LOGIC !A | !B
0
%10111
0
!A | !B
1
1
LOGIC A & B
0
%11000
0
A &B
1
1
LOGIC A == B
0
%11001
0
A == B
1
LOGIC A
0
%11010
0
A
1
1
LOGIC A | !B
0
%11011
0
A | !B
1
LOGIC B
0
%11100
0
B
1
1
LOGIC !A | B
0
%11101
0
!A | B
1
1
LOGIC A | B
0
%11110
0
A |B
LOGIC always
0
%11111
0
1
*Must set corresponding DIR bit to affect pin. A1 = APIN input delayed by 1 clock. A2 = APIN input delayed by 2 clocks. B1 = BPIN input delayed by 1 clock.

4.10.

Video Generator

Each cog has a video generator module that facilitates
transmitting video image data at a constant rate. There are
two registers and one instruction which provide control
and access to the video generator. Counter A of the cog
must be running in a PLL mode and is used to generate
the timing signal for the Video Generator. The Video
Scale Register specifies the number of Counter A PLL
(PLLA) clock cycles for each pixel and number of clock
cycles before fetching another frame of data provided by
the WAITVID instruction which is executed within the cog.
The Video Configuration Register establishes the mode
the Video Generator should operate, and can generate
VGA or composite video (NTSC or PAL).
The Video Generator should be initialized by first starting
Counter A, setting the Video Scale Register, setting the

Video Configuration Register, then finally providing data
via the WAITVID instruction. Failure to properly initialize
the Video Generator by first starting PLLA will cause the
cog to indefinitely hang when the WAITVID instruction is
executed.
4.10.1. VCFG – Video Configuration Register
The Video Configuration Register contains the
configuration settings of the video generator and is shown
in Table 7.
In Propeller Assembly, the VMode through AuralSub
fields can conveniently be written using the MOVI
instruction, the VGroup field can be written with the MOVD
instruction, and the VPins field can be written with the
MOVS instruction.

Table 7: VCFG Register
31

30..29

25..23

22..12

11..9

7..0

VMode

CMode

Chroma1

Chroma0

AuralSub

VGroup

VPins

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The 2-bit VMode (video mode) field selects the type and
orientation of video output, if any, according to Table 8.

The VPins (video output pins) field is a mask applied to
the pins of VGroup that indicates which pins to output
video signals on.

Table 8: The Video Mode Field

Table 11: The VPins Field

VMode Video Mode
00

Disabled, no video generated.

VGA mode; 8-bit parallel output on VPins 7:0

Composite Mode 1; broadcast on VPins 7:4, baseband
on VPins 3:0

Composite Mode 2; baseband on VPins 7:4, broadcast
on VPins 3:0

The CMode (color mode) field selects two or four color
mode. 0 = two-color mode; pixel data is 32 bits by 1 bit
and only colors 0 or 1 are used. 1 = four-color mode;
pixel data is 16 bits by 2 bits, and colors 0 through 3 are
used.
The Chroma1 (broadcast chroma) bit enables or disables
chroma (color) on the broadcast signal. 0 = disabled, 1 =
enabled.
The Chroma0 (baseband chroma) bit enables or disables
chroma (color) on the baseband signal. 0 = disabled, 1 =
enabled.
The AuralSub (aural sub-carrier) field selects the source
of the FM aural (audio) sub-carrier frequency to be
modulated on. The source is the PLLA of one of the
cogs, identified by AuralSub’s value. This audio must
already be modulated onto the 4.5 MHz sub-carrier by the
source PLLA.
Table 9: The AuralSub Field
AuralSub

Sub-Carrier Frequency Source

000

Cog 0’s PLLA

001

Cog 1’s PLLA

010

Cog 2’s PLLA

011

Cog 3’s PLLA

100

Cog 4’s PLLA

101

Cog 5’s PLLA

110

Cog 6’s PLLA

111

Cog 7’s PLLA

The VGroup (video output pin group) field selects which
group of 8 I/O pins to output video on.
Table 10: The VGroup Field
VGroup

Pin Group

000

Group 0: P7..P0

001

Group 1: P15..P8

010

Group 2: P23..P16

011

Group 3: P31..P24

100-111

VPins
00001111
11110000
11111111
XXXXXXXX

Effect
Drive Video on lower 4 pins only; composite
Drive Video on upper 4 pins only; composite
Drive video on all 8 pins; VGA
Any value is valid for this field; the above
values are the most common.

4.10.2. VSCL – Video Scale Register
The Video Scale Register sets the rate at which video data
is generated, and is shown in Table 12.
Table 12: VSCL Register
VSCL Bits
31..20

19..12

11..0

−

PixelClocks

FrameClocks

The 8-bit PixelClocks field indicates the number of clocks
per pixel; the number of clocks that should elapse before
each pixel is shifted out by the video generator module.
These clocks are the PLLA clocks, not the System Clock.
A value of 0 for this field is interpreted as 256.
The 12-bit FrameClocks field indicates the number of
clocks per frame; the number of clocks that will elapse
before each frame is shifted out by the video generator
module. These clocks are the PLLA clocks, not the
System Clock. A frame is one long of pixel data
(delivered via the WAITVID command). Since the pixel
data is either 16 bits by 2 bits, or 32 bits by 1 bit (meaning
16 pixels wide with 4 colors, or 32 pixels wide with 2
colors, respectively), the FrameClocks is typically 16 or
32 times that of the PixelClocks value. A value of 0 for
this field is interpreted as 4096.
4.10.3. WAITVID Command/Instruction
The WAITVID instruction is the delivery mechanism for
data to the cog’s Video Generator hardware. Since the
Video Generator works independently from the cog itself,
the two must synchronize each time data is needed for the
display device. The frequency at which this occurs is
dictated by the frequency of PLLA and the Video Scale
Register. The cog must have new data available before the
moment the Video Generator needs it. The cog uses
WAITVID to wait for the right time and then “hand off”
this data to the Video Generator.
Two longs of data are passed to the Video Generator by
with the syntax WAITVID Colors, Pixels.
The Colors parameter is a 32-bit value containing either
four 8-bit color values (for 4 color mode) or two 8-bit
color values in the lower 16 bits (for 2 color mode). For

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VGA mode, each 8-bit color value is written to the pins
specified by the VGroup and VPins field. For VGA
typically the 8 bits are grouped into 2 bits per primary
color and Horizontal and Vertical Sync control lines, but
this is up to the software and application of how these bits
are used. For composite video each 8-bit color value is
composed of 3 fields. Bits 0-2 are the luminance value of
the generated signal. Bit 3 is the modulation bit which
dictates whether the chroma information will be generated
and bits 4-7 indicate the phase angle of the chroma value.
When the modulation bit is set to 0, the chroma
information is ignored and only the luminance value is
output to pins. When the modulation bit is set to 1 the
luminance value is modulated ± 1 with a phase angle set
by bits 4-7. In order to achieve the full resolution of the
chroma value, PLLA should be set to 16 times the
modulation frequency (in composite video this is called
the color-burst frequency). The PLLB of the cog is used
to generate the broadcast frequency; whether this is
generated depends on if PLLB is running and the values
of VMode and VPins.
The Pixels parameter describes the pixel pattern to
display, either 16 pixels or 32 pixels depending on the
color depth configuration of the Video Generator. When
four-color mode is specified, Pixels is a 16x2 bit pattern
where each 2-bit pixel is an index into Colors on which
data pattern should be presented to the pins. When twocolor mode is specified, Pixels is a 32x1 bit pattern where
each bit specifies which of the two color patterns in the
lower 16 bits of Colors should be output to the pins. The
Pixel data is shifted out least significant bits (LSB) first.

When the FrameClocks value is greater than 16 times the
PixelClocks value and 4-color mode is specified, the two
most significant bits are repeated until FrameClocks
PLLA cycles have occurred. When FrameClocks value is
greater than 32 times PixelClocks value and 2-color mode
is specified, the most significant bit is repeated until
FrameClocks PLLA cycles have occurred. When
FrameClocks cycles occur and the cog is not in a WAITVID
instruction, whatever data is on the source and destination
busses at the time will be fetched and used. So it is
important to be in a WAITVID instruction before this
occurs.
While the Video Generator was created to display video
signals, its potential applications are much more diverse.
The Composite Video mode can be used to generate
phase-shift keying communications of a granularity of 16
or less and the VGA mode can be used to generate any bit
pattern with a fully settable and predictable rate.
Figure 6 is a block diagram of how the VGA mode is
organized. The two inverted triangles are the load
mechanism for Pixels and Colors; n is 1 or 2 bits
depending on the value of CMode. The inverted trapezoid
is a 4-way 8-bit multiplexer that chooses which byte of
Colors to output. When in composite video mode the
Modulator transforms the byte into the luminance and
chroma signal and outputs the broadcast signal. VGroup
steers the 8 bits to a block of output pins and outputs to
those pins which are set to 1 in VPins; this combined
functionality is represented by the hexagon.

Figure 6: Video Generator

Source

Destination
PLLA/FrameClocks

Colors
Pixels

Shift by n
PLLA/PixelClocks

Modulator
VPins

VGroup

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Propeller™ P8X32A Datasheet

4.11.

www.parallax.com

Use Spin's CLKSET command when possible (see sections
6.3 and 6.4) since it automatically updates all the abovementioned locations with the proper information.

CLK Register

The CLK register is the System Clock configuration
control; it determines the source and characteristics of the
System Clock. It configures the RC Oscillator, Clock
PLL, Crystal Oscillator, and Clock Selector circuits (See
the Block Diagram, page 1). It is configured at compile
time by the _CLKMODE declaration and is writable at run
time through the CLKSET command. Whenever the CLK
register is written, a global delay of ~75 µs occurs as the
clock source transitions.
Whenever this register is changed, a copy of the value
written should be placed in the Clock Mode value
location (which is BYTE[4] in Main RAM) and the
resulting master clock frequency should be written to the
Clock Frequency value location (which is LONG[0] in
Main RAM) so that objects which reference this data will
have current information for their timing calculations.

Table 13: Valid Clock Modes
Valid Expression

CLK Reg. Value Valid Expression CLK Reg. Value

RCFAST

0_0_0_00_000 XTAL1 + PLL1X
XTAL1 + PLL2X
0_0_0_00_001 XTAL1 + PLL4X
XTAL1 + PLL8X
0_0_1_00_010 XTAL1 + PLL16X

0_1_1_01_011
0_1_1_01_100
0_1_1_01_101
0_1_1_01_110
0_1_1_01_111

XTAL1
XTAL2
XTAL3

XTAL2 + PLL1X
0_0_1_01_010 XTAL2 + PLL2X
0_0_1_10_010 XTAL2 + PLL4X
0_0_1_11_010 XTAL2 + PLL8X
XTAL2 + PLL16X

0_1_1_10_011
0_1_1_10_100
0_1_1_10_101
0_1_1_10_110
0_1_1_10_111

XINPUT + PLL1X
XINPUT + PLL2X
XINPUT + PLL4X
XINPUT + PLL8X
XINPUT + PLL16X

0_1_1_00_011
0_1_1_00_100
0_1_1_00_101
0_1_1_00_110
0_1_1_00_111

0_1_1_11_011
0_1_1_11_100
0_1_1_11_101
0_1_1_11_110
0_1_1_11_111

RCSLOW
XINPUT

XTAL3 + PLL1X
XTAL3 + PLL2X
XTAL3 + PLL4X
XTAL3 + PLL8X
XTAL3 + PLL16X

Table 14: CLK Register Fields
Bit

Name

RESET

PLLENA

OSCENA

OSCM1

OSCM2

CLKSEL2

CLKSEL1

CLKSEL0

RESET

Effect

Always write ‘0’ here unless you intend to reset the chip.

Same as a hardware reset – reboots the chip.

PLLENA

Effect

Disables the PLL circuit.

Enables the PLL circuit. The PLL internally multiplies the XIN pin frequency by 16. OSCENA must be ‘1’ to propagate the
XIN signal to the PLL. The PLL’s internal frequency must be kept within 64 MHz to 128 MHz – this translates to an XIN
frequency range of 4 MHz to 8 MHz. Allow 100 µs for the PLL to stabilize before switching to one of its outputs via the
CLKSEL bits. Once the OSC and PLL circuits are enabled and stabilized, you can switch freely among all clock sources by
changing the CLKSEL bits.

OSCENA

Effect

Disables the OSC circuit

Enables the OSC circuit so that a clock signal can be input to XIN, or so that XIN and XOUT can function together as a
feedback oscillator. The OSCM bits select the operating mode of the OSC circuit. Note that no external resistors or
capacitors are required for crystals and resonators. Allow a crystal or resonator 10 ms to stabilize before switching to an
OSC or PLL output via the CLKSEL bits. When enabling the OSC circuit, the PLL may be enabled at the same time so that
they can share the stabilization period.

OSCM1

OSCM2

XOUT Resistance

Infinite

2000 Ω

36 pF

4 MHz to 16 MHz Crystal/Resonator

1000 Ω

26 pF

8 MHz to 32 MHz Crystal/Resonator

500 Ω

16 pF

20 MHz to 60 MHz Crystal/Resonator

CLKSEL2

CLKSEL1

CLKSEL0

Master Clock

Source

~12 MHz

Internal

No external parts (8 to 20 MHz)

~20 kHz

Internal

No external parts, very low power (13-33 kHz)

XIN

OSC

XIN × 1

OSC+PLL

OSCENA and PLLENA must be ‘1’

XIN × 2

OSC+PLL

OSCENA and PLLENA must be ‘1’

XIN × 4

OSC+PLL

OSCENA and PLLENA must be ‘1’

XIN × 8

OSC+PLL

OSCENA and PLLENA must be ‘1’

XIN × 16

OSC+PLL

OSCENA and PLLENA must be ‘1’

XIN and XOUT Capacitance
6 pF (pad only)

Page 14 of 37

Frequency Range
DC to 80 MHz Input

Notes

OSCENA must be ‘1’

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

www.parallax.com

5.0

MEMORY ORGANIZATION

5.1.

Main Memory

The Main Memory is a block of 64 K bytes (16 K longs)
that is accessible by all cogs as a mutually-exclusive
resource through the Hub. It consists of 32 KB of RAM
and 32 KB of ROM. Main memory is byte, word and long
addressable. Words and longs are stored in little endian
format; least-significant byte first.

5.1.1. Main RAM
The 32 KB of Main RAM is general purpose and is the
destination of a Propeller Application either downloaded
from a host or from the external 32 KB EEPROM.

5.1.2. Main ROM
The 32 KB of Main ROM contains all the code and data
resources vital to the Propeller chip’s function: character
definitions, log, anti-log and sine tables, and the Boot
Loader and Spin Interpreter.
5.1.3. Character Definitions
The first half of ROM is dedicated to a set of 256
character definitions. Each character definition is 16
pixels wide by 32 pixels tall. These character definitions
can be used for video generation, graphical LCD's,
printing, etc.
The character set is based on a North American / Western
European layout, with many specialized characters added
and inserted. There are connecting waveform and
schematic building-block characters, Greek characters
commonly used in electronics, and several arrows and
bullets. (A corresponding Parallax True-Type Font is
installed with and used by the Propeller Tool software,
and is available to other Windows applications.)
The character definitions are numbered 0 to 255 from leftto-right, then top-to-bottom, per Figure 7 below. They are
arranged as follows: Each pair of adjacent even-odd
characters is merged together to form 32 longs. The first
character pair is located in $8000-$807F. The second pair
occupies $8080-$80FF, and so on, until the last pair fills
$BF80-$BFFF.

Figure 7: Propeller Font Character Set

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Figure 8
Propeller Character
Interleaving

As shown in Figure 8, The character pairs are merged
row-by-row such that each character's 16 horizontal pixels
are spaced apart and interleaved with their neighbors' so
that the even character takes bits 0, 2, 4, ...30, and the odd
character takes bits 1, 3, 5, ...31. The leftmost pixels are in
the lowest bits, while the rightmost pixels are in the
highest bits. This forms a long for each row of pixels in
the character pair. 32 such longs, building from top row
down to bottom, make up the complete merged-pair
definition. The definitions are encoded in this manner so
that a cog’s video hardware can handle the merged longs
directly, using color selection to display either the even or
the odd character.
Some character codes have inescapable meanings, such as
9 for Tab, 10 for Line Feed, and 13 for Carriage Return.
These character codes invoke actions and do not equate to
static character definitions. For this reason, their character
definitions have been used for special four-color
characters. These four-color characters are used for
drawing 3-D box edges at run-time and are implemented
as 16 x 16 pixel cells, as opposed to the normal 16 x 32
pixel cells. They occupy even-odd character pairs 0-1, 89, 10-11, and 12-13.

5.1.4. Math Function Tables
Base-2 Log and Anti-Log tables, each with 2048 unsigned
words, facilitate converting values to and from exponent
form to facilitate some operations; see the Propeller
Manual for access instructions. Also, a sine table
provides 2049 unsigned 16-bit sine samples spanning 0°
to 90° inclusively (0.0439° resolution).

5.2.

Cog RAM

As stated in Section 4.3, the Cog RAM is used for
executable code, data, and variables, and the last 16
locations serve as interfaces to the System Counter, I/O
pins, and local cog peripherals (see Table 15). Cog RAM
is long-addressable only.
When a cog is booted up, locations 0 ($000) through 495
($1EF) are loaded sequentially from Main RAM / ROM
and its special purpose locations, 496 ($1F0) through 511
($1FF), are cleared to zero. Each Special Purpose register
may be accessed via its physical address, its predefined
name, or indirectly in Spin via a register array variable
SPR with an index of 0 to 15, the last four bits of the
register's address.

Table 15: Cog RAM Special Purpose Registers
Cog RAM Map

Address

Name

Type

$1F0

PAR

Read-Only

Description
1

Boot Parameter

System Counter

Input States for P31 - P0

$1F1

CNT

Read-Only

$1F2

INA

Read-Only

$1F3

INB

Read-Only

Input States for P63- P32

$1F4

OUTA

Read/Write

Output States for P31 - P0

$1F5

OUTB

Read/Write

Output States for P63 – P32

$1F6

DIRA

Read/Write

Direction States for P31 - P0

$1F7

DIRB

Read/Write

Direction States for P63 - P32

$1F8

CTRA

Read/Write

Counter A Control

$1F9

CTRB

Read/Write

Counter B Control

$1FA

FRQA

Read/Write

Counter A Frequency

$1FB

FRQB

Read/Write

Counter B Frequency

$1FC

PHSA

Read/Write

$1FD

PHSB

Read/Write

$1FE

VCFG

Read/Write

Video Configuration

$1FF

VSCL

Read/Write

Video Scale

Counter A Phase:
Counter B Phase

Note 1: Only accessible as a source register (i.e. MOV Dest, Source).
Note 2: Only readable as a Source Register (i.e. MOV Dest, Source); read-modify-write not possible as a Destination Register.
Note 3: Reserved for future use.
Copyright © Parallax Inc.

Page 16 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

6.0

www.parallax.com

PROGRAMMING LANGUAGES

The Propeller chip is programmed using two languages designed specifically for it: 1) Spin, a high-level object-based
language, and 2) Propeller Assembly, a low-level, highly-optimized assembly language. There are many hardware-based
commands in Propeller Assembly that have direct equivalents in the Spin language.
The Spin language is compiled by the Propeller Tool software into tokens that are interpreted at run time by the Propeller
chip’s built-in Spin Interpreter. The Propeller Assembly language is assembled into pure machine code by the Propeller Tool
and is executed in its pure form at run time.
Propeller Objects can be written entirely in Spin or can use various combinations of Spin and Propeller Assembly. It is often
advantageous to write objects almost entirely in Propeller Assembly, but at least two lines of Spin code are required to launch
the final application.

6.1.

Reserved Word List

All words listed are always reserved, whether programming in Spin or in Propeller Assembly. As of Propeller Tool v1.05:
Table 16: Reserved Word List
s
d
a
d
a
s
_CLKFREQ
COGINIT
IF_C_AND_NZ
LOCKNEW
NOP
REPEAT
s
s
a
d
s
a
_CLKMODE
COGNEW
IF_C_AND_Z
LOCKRET
NOT
RES
s
d
a
d
a
s
_FREE
COGSTOP
IF_C_EQ_Z
LOCKSET
NR
RESULT
s
s
a
s
s
a
_STACK
IF_C_NE_Z
LONG
OBJ
RET
CON
s
s
a
s
a
s
_XINFREQ
CONSTANT
IF_C_OR_NZ
LONGFILL
ONES #
RETURN
s
d
a
s
d
a
ABORT
CTRA
IF_C_OR_Z
LONGMOVE
OR
REV
a
d
a
s
a
a
ABS
CTRB
IF_E
LOOKDOWN
ORG
ROL
a
s
a
s
s
a
ABSNEG
DAT
IF_NC
LOOKDOWNZ
OTHER
ROR
a
d
a
s
d
s
ADD
DIRA
IF_NC_AND_NZ LOOKUP
OUTA
ROUND
a
d#
a
s
d#
a
ADDABS
LOOKUPZ
OUTB
SAR
DIRB
IF_NC_AND_Z
a
a
a
a
d
a
ADDS
DJNZ
IF_NC_OR_NZ
MAX
SHL
PAR
a
s
a
a
d
a
ADDSX
ELSE
IF_NC_OR_Z
MAXS
PHSA
SHR
a
s
a
a
d
s
ADDX
ELSEIF
IF_NE
MIN
PHSB
SPR
d
s
a
a
d
s
AND
ELSEIFNOT
IF_NEVER
PI
STEP
MINS
a
a#
a
a
s
s
ANDN
ENC
IF_NZ
MOV
PLL1X
STRCOMP
s
d
a
a
s
s
BYTE
FALSE
IF_NZ_AND_C
MOVD
STRING
PLL2X
s
s
a
a
s
s
BYTEFILL
FILE
IF_NZ_AND_NC MOVI
PLL4X
STRSIZE
s
a
a
a
s
a
BYTEMOVE
FIT
MOVS
PLL8X
SUB
IF_NZ_OR_C
a
s
a
a#
s
a
CALL
FLOAT
IF_NZ_OR_NC
MUL
PLL16X
SUBABS
s
s
a
a#
d
a
CASE
FROM
IF_Z
MULS
POSX
SUBS
s
d
a
a
s
a
CHIPVER
FRQA
IF_Z_AND_C
MUXC
PRI
SUBSX
s
d
a
a
s
a
CLKFREQ
FRQB
IF_Z_AND_NC
MUXNC
PUB
SUBX
s
a
a
a
s
a
CLKMODE
HUBOP
IF_Z_EQ_C
MUXNZ
QUIT
SUMC
d
s
a
a
s
a
CLKSET
IF
IF_Z_NE_C
MUXZ
RCFAST
SUMNC
a
s
a
a
a
a
CMP
IFNOT
IF_Z_OR_C
NEG
RCL
SUMNZ
a
a
a
a
a
a
CMPS
IF_A
IF_Z_OR_NC
NEGC
RCR
SUMZ
a
a
d
a
s
a
CMPSUB
IF_AE
INA
NEGNC
TEST
RCSLOW
a
a
d#
a
a
a
CMPSX
IF_ALWAYS
INB
RDBYTE
NEGNZ
TESTN
a
a
a
d
a
a
CMPX
IF_B
JMP
NEGX
RDLONG
TJNZ
d
a
a
a
a
a
CNT
JMPRET
NEGZ
RDWORD
TJZ
IF_BE
d
a
d
s
s
s
IF_C
LOCKCLR
NEXT
REBOOT
TO
COGID
a = Assembly element; s = Spin element; d = dual (available in both languages); # = reserved for future use
6.1.1.

TRUE
s
TRUNC
s
UNTIL
s
VAR
d
VCFG
d
VSCL
d
WAITCNT
d
WAITPEQ
d
WAITPNE
d
WAITVID
a
WC
s
WHILE
s
WORD
s
WORDFILL
s
WORDMOVE
a
WR
a
WRBYTE
a
WRLONG
a
WRWORD
a
WZ
s
XINPUT
a
XOR
s
XTAL1
s
XTAL2
s
XTAL3

Words Reserved for Future Use

• DIRB, INB, and OUTB: Reserved for future use with a possible 64 I/O pin model. When used with the P8X32A, these
labels can be used to access Cog RAM at those locations for general-purpose use.
• ENC, MUL, MULS, ONES: Use with the current P8X32A architecture yields indeterminate results.
Copyright © Parallax Inc.

Page 17 of 37

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Propeller™ P8X32A Datasheet

6.2.

www.parallax.com

Math and Logic Operators
Table 17: Math and Logic Operators
Operator

Level

Highest
(0)

3
4

6
7

Constant
3
Expressions

Is Unary

Description

Normal

Assign

always

Pre-decrement (--X) or post-decrement (X--).

always

Pre-increment (++X) or post-increment (X++).

always

Sign-extend bit 7 (~X) or post-clear to 0 (X~).

always

Sign-extend bit 15 (~~X) or post-set to -1 (X~~).

always

Random number forward (?X) or reverse (X?).

never

Symbol address.

never

Integer

Float

Object address plus symbol.

Positive (+X); unary form of Add.

if solo

Negate (-X); unary form of Subtract.

if solo

Square root.

if solo

Absolute value.

if solo

Bitwise: Decode 0 – 31 to long w/single-high-bit.

if solo

Bitwise: Encode long to 0 – 32; high-bit priority.

if solo

Bitwise: NOT.

<-=

Bitwise: Rotate left.

->=

Bitwise: Rotate right.

<<=

Bitwise: Shift left.

>>=

Bitwise: Shift right.

~>=

Shift arithmetic right.

><=

Bitwise: Reverse.

Bitwise: AND.

Bitwise: OR.

**=

Bitwise: XOR.
9

Multiply and return lower 32 bits (signed).
Multiply and return upper 32 bits (signed).

//=

Divide (signed).

Add.

Subtract.

#>=

Limit minimum (signed).

<#=

Limit maximum (signed).

Boolean: Is less than (signed).

Boolean: Is greater than (signed).

<>=

Boolean: Is not equal.

===

Boolean: Is equal.

=<=

Boolean: Is equal or less (signed).

Modulus (signed).

=>=

NOT

if solo

AND

AND=

OR=

Lowest
(12)

always

n/a

Boolean: Is equal or greater (signed).
9

Boolean: OR (promotes non-0 to -1).

9
3
3

n/a

Boolean: NOT (promotes non-0 to -1).
Boolean: AND (promotes non-0 to -1).

Constant assignment (CON blocks).

always
n/a
n/a
Variable assignment (PUB/PRI blocks).
:=
1 Precedence level: higher-level operators evaluate before lower-level operators. Operators in same level are commutable; evaluation order does not matter.
2 Assignment forms of binary (non-unary) operators are in the lowest precedence (level 12).
3 Assignment forms of operators are not allowed in constant expressions.

Page 18 of 37

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Propeller™ P8X32A Datasheet

6.3.

www.parallax.com

Spin Language Summary Table
Returns
Value

Spin Command
ABORT 〈Value〉

Description
Exit from PUB/PRI method using abort status with optional return value.

BYTE Symbol 〈[Count]〉

Declare byte-sized symbol in VAR block.

〈Symbol〉 BYTE

Declare byte-aligned and/or byte-sized data in DAT block.

Data 〈[Count]〉

BYTE [BaseAddress] 〈[Offset]〉

Read/write byte of main memory.

Symbol.BYTE 〈[Offset]〉

Read/write byte-sized component of word/long-sized variable.

BYTEFILL (StartAddress, Value, Count)

Fill bytes of main memory with a value.

BYTEMOVE (DestAddress, SrcAddress, Count)

Copy bytes from one region to another in main memory.

CASE CaseExpression
MatchExpression :
Statement(s)
〈 MatchExpression :
Statement(s)〉
〈 OTHER :
Statement(s)〉

Compare expression against matching expression(s), execute code block
if match found.
MatchExpression can contain a single expression or multiple commadelimited expressions. Expressions can be a single value (ex: 10) or a
range of values (ex: 10..15).

CHIPVER

Version number of the Propeller chip (Byte at $FFFF)

CLKFREQ

Current System Clock frequency, in Hz (Long at $0000)

CLKMODE

Current clock mode setting (Byte at $0004)

CNT

Current 32-bit System Counter value.

COGID

Current cog’s ID number; 0-7.

CLKSET (Mode, Frequency)

Set both clock mode and System Clock frequency at run time.

COGINIT (CogID, SpinMethod 〈(ParameterList)〉, StackPointer)

Start or restart cog by ID to run Spin code.

COGINIT (CogID, AsmAddress, Parameter)

Start or restart cog by ID to run Propeller Assembly code.

COGNEW (SpinMethod 〈(ParameterList)〉, StackPointer)

Start new cog for Spin code and get cog ID; 0-7 = succeeded, -1 = failed.

COGNEW (AsmAddress, Parameter)

Start new cog for Propeller Assembly code and get cog ID; 0-7 =
succeeded, -1 = failed.

COGSTOP (CogID)

Stop cog by its ID.

CON
Symbol = Expr 〈((,┆ )) Symbol = Expr〉…
CON
#Expr ((,┆ )) Symbol 〈[Offset]〉 〈((,┆ )) Symbol 〈[Offset]〉 …
CON
Symbol 〈[Offset]〉 〈((,┆ )) Symbol 〈[Offset]〉 〉…

Declare symbolic, global constants.
Declare global enumerations (incrementing symbolic constants).
Declare global enumerations (incrementing symbolic constants).

CONSTANT (ConstantExpression)

Declare in-line constant expression to be completely resolved at compile
time.

CTRA

Counter A Control register.

CTRB

Counter B Control register.

DAT

〈Symbol〉 Alignment 〈Size〉 〈Data〉 〈[Count]〉 〈,〈Size〉

DAT

〈Symbol〉 〈Condition〉
DIRA 〈[Pin(s)]〉

Declare table of data, aligned and sized as specified.

Data 〈[Count]〉〉…

Denote Propeller Assembly instruction.

Instruction 〈Effect(s)〉
9

Direction register for 32-bit port A. Default is 0 (input) upon cog startup.

FILE "FileName"

Import external file as data in DAT block.

FLOAT (IntegerConstant)

Convert integer constant expression to compile-time floating-point value in
any block.

FRQA

Counter A Frequency register.

FRQB

Counter B Frequency register.

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Returns
Value

Spin Command

((IF ┆ IFNOT))

Condition(s)
IfStatement(s)
〈ELSEIF Condition(s)
ElseIfStatement(s)〉…
〈ELSEIFNOT Condition(s)
ElseIfStatement(s)〉…
〈ELSE
ElseStatement(s)〉

Description
Test condition(s) and execute block of code if valid.
IF and ELSEIF each test for TRUE. IFNOT and ELSEIFNOT each test for
FALSE.

INA 〈[Pin(s)]〉

Input register for 32-bit ports A.

LOCKCLR (ID)

Clear semaphore to false and get its previous state; TRUE or FALSE.

LOCKNEW

Check out new semaphore and get its ID; 0-7, or -1 if none were available.
Return semaphore back to semaphore pool, releasing it for future
LOCKNEW requests.

LOCKRET (ID)
9

LOCKSET (ID)

Set semaphore to true and get its previous state; TRUE or FALSE.

LONG Symbol 〈[Count]〉

Declare long-sized symbol in VAR block.

〈Symbol〉

Declare long-aligned and/or long-sized data in DAT block.

LONG Data 〈[Count]〉

LONG [BaseAddress] 〈[Offset]〉

Read/write long of main memory.

LONGFILL (StartAddress, Value, Count)

Fill longs of main memory with a value.

LONGMOVE (DestAddress, SrcAddress, Count)

Copy longs from one region to another in main memory.

LOOKDOWN (Value:ExpressionList)

Get the one-based index of a value in a list.

LOOKDOWNZ (Value:ExpressionList)

Get the zero-based index of a value in a list.

LOOKUP (Index:ExpressionList)

Get value from a one-based index position of a list.

LOOKUPZ (Index:ExpressionList)

Get value from a zero-based index position of a list.
Skip remaining statements of REPEAT loop and continue with the next
loop iteration.

NEXT
OBJ
Symbol 〈[Count]〉:"Object"

〈

Declare symbol object references.

Symbol 〈[Count]〉: "Object"〉…

OUTA 〈[Pin(s)]〉

Output register for 32-bit port A. Default is 0 (ground) upon cog startup.

PAR

Cog Boot Parameter register.

PHSA

Counter A Phase Lock Loop (PLL) register.

PHSB

Counter B Phase Lock Loop (PLL) register.

PRI Name 〈(Par 〈,Par〉…)〉 〈:RVal〉 〈| LVar 〈[Cnt]〉〉 〈,LVar 〈[Cnt]〉〉…
SourceCodeStatements
PUB Name 〈(Par 〈,Par〉…)〉 〈:RVal〉 〈| LVar 〈[Cnt]〉〉 〈,LVar 〈[Cnt]〉〉…
SourceCodeStatements

Declare private method with optional parameters, return value and local
variables.
Declare public method with optional parameters, return value and local
variables.

QUIT

Exit from REPEAT loop immediately.

REBOOT

Reset the Propeller chip.

REPEAT 〈Count〉
Statement(s)
REPEAT Variable FROM Start TO Finish 〈STEP Delta〉
Statement(s)
REPEAT ((UNTIL┆ WHILE)) Condition(s)
Statement(s)
REPEAT
Statement(s)
((UNTIL┆ WHILE)) Condition(s)

Execute code block repetitively, either infinitely, or for a finite number of
iterations.
Execute code block repetitively, for finite, counted iterations.
Execute code block repetitively, zero-to-many conditional iterations.
Execute code block repetitively, one-to-many conditional iterations.

RESULT

Return value variable for PUB/PRI methods.

RETURN 〈Value〉

Exit from PUB/PRI method with optional return Value.

ROUND (FloatConstant)

Round floating-point constant to the nearest integer at compile-time, in any
block.

SPR [Index]

Special Purpose Register array.

STRCOMP (StringAddress1, StringAddress2)

Compare two strings for equality.

STRING (StringExpression)

Declare in-line string constant and get its address.

Page 20 of 37

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Returns
Value

Spin Command

Description

STRSIZE (StringAddress)

Get size, in bytes, of zero-terminate string.

TRUNC (FloatConstant)

Remove fractional portion from floating-point constant at compile-time, in
any block.

VAR
Size Symbol 〈[Count]〉

〈((,┆

Declare symbolic global variables.

Size )) Symbol 〈[Count]〉〉…

VCFG

Video Configuration register.

VSCL

Video Scale register.

WAITCNT (Value)

Pause cog’s execution temporarily.

WAITPEQ (State, Mask, Port)

Pause cog’s execution until I/O pin(s) match designated state(s).

WAITPNE (State, Mask, Port)

Pause cog’s execution until I/O pin(s) do not match designated state(s).

WAITVID (Colors, Pixels)

Pause cog’s execution until its Video Generator is available for pixel data.

WORD Symbol 〈[Count]〉

Declare word-sized symbol in VAR block.

〈Symbol〉

Declare word-aligned and/or word-sized data in DAT block.

WORD Data 〈[Count]〉

WORD [BaseAddress] 〈[Offset]〉

Read/write word of main memory.

Symbol.WORD 〈[Offset]〉

Read/write word-sized component of long-sized variable.

WORDFILL (StartAddress, Value, Count)

Fill words of main memory with a value.

WORDMOVE (DestAddress, SrcAddress, Count)

Copy words from one region to another in main memory.

6.3.1.

Constants
Constants (pre-defined)
1

Constant

Description

_CLKFREQ

Settable in Top Object File to specify System Clock frequency.

_CLKMODE

Settable in Top Object File to specify application’s clock mode.

_XINFREQ

Settable in Top Object File to specify external crystal frequency.

_FREE

Settable in Top Object File to specify application’s free space.

_STACK

Settable in Top Object File to specify application’s stack space.

TRUE

Logical true:

-1

($FFFFFFFF)

FALSE

Logical false:

($00000000)

POSX

Max. positive integer:

2,147,483,647

($7FFFFFFF)

NEGX

Max. negative integer:

-2,147,483,648

($80000000)

Floating-point PI:

≈ 3.141593

($40490FDB)

RCFAST

Internal fast oscillator:

$00000001

(%00000000001)

RCSLOW

Internal slow oscillator:

$00000002

(%00000000010)

XINPUT

External clock/oscillator:

$00000004

(%00000000100)

XTAL1

External low-speed crystal:

$00000008

(%00000001000)

XTAL2

External medium-speed crystal:

$00000010

(%00000010000)

XTAL3

External high-speed crystal:

$00000020

(%00000100000)

PLL1X

External frequency times 1:

$00000040

(%00001000000)

PLL2X

External frequency times 2:

$00000080

(%00010000000)

PLL4X

External frequency times 4:

$00000100

(%00100000000)

PLL8X

External frequency times 8:

$00000200

(%01000000000)

PLL16X

External frequency times 16:

$00000400

(%10000000000)

“Settable” constants are defined in Top Object File’s CON block. See Valid Clock Modes for _CLKMODE. Other settable constants use whole numbers.

Page 21 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

6.4.

www.parallax.com

Propeller Assembly Instruction Table

The Propeller Assembly Instruction Table lists the instruction’s 32-bit opcode, outputs and number of clock cycles. The
opcode consists of the instruction bits (iiiiii), the “effect” status for the Z flag, C flag, result and indirect/immediate status
(zcri), the conditional execution bits (cccc), and the destination and source bits (ddddddddd and sssssssss). The meaning of the
Z and C flags, if any, is shown in the Z Result and C Result fields; indicating the meaning of a 1 in those flags. The Result field
(R) shows the instruction’s default behavior for writing (1) or not writing (0) the instruction’s result value. The Clocks field
shows the number of clocks the instruction requires for execution.
0 1
Zeros (0) and ones (1) mean binary 0 and 1.
i
Lower case “i” denotes a bit that is affected by immediate status.
d s
Lower case “d” and “s” indicate destination and source bits.
?
Question marks denote bits that are dynamically set by the compiler.
--Hyphens indicate items that are not applicable or not important.
..
Double-periods represent a range of contiguous values.
Z Result

C Result

WRBYTE

D,S Write D[7..0] to main memory byte S[15..0]

7..22 *

000000 001i 1111 ddddddddd sssssssss

RDBYTE

Read main memory byte S[15..0] into D (0D,S
extended)

Result = 0

7..22 *

000001 000i 1111 ddddddddd sssssssss

WRWORD

D,S Write D[15..0] to main memory word S[15..1]

7..22 *

000001 001i 1111 ddddddddd sssssssss

RDWORD

D,S

Result = 0

7..22 *

000010 000i 1111 ddddddddd sssssssss

WRLONG

D,S Write D to main memory long S[15..2]

7..22 *

000010 001i 1111 ddddddddd sssssssss

RDLONG

D,S Read main memory long S[15..2] into D

Result = 0

7..22 *

000011 000i 1111 ddddddddd sssssssss

HUBOP

D,S Perform hub operation according to S

Result = 0

7..22 *

000011 0001 1111 ddddddddd ------000

CLKSET

Set the global CLK register to D[7..0]

7..22 *

000011 0011 1111 ddddddddd ------001

COGID

Get this cog number (0..7) into D

ID = 0

7..22 *

000011 0001 1111 ddddddddd ------010

COGINIT D

Initialize a cog according to D

ID = 0

No cog free

7..22 *

000011 0001 1111 ddddddddd ------011

COGSTOP D

Stop cog number D[2..0]

Stopped ID = 0

No Cog Free

7..22 *

000011 0011 1111 ddddddddd ------100

LOCKNEW D

Checkout a new LOCK number (0..7) into D

ID = 0

No lock free

7..22 *

000011 0001 1111 ddddddddd ------101

LOCKRET D

Return lock number D[2..0]

ID = 0

No lock free

7..22 *

000011 0001 1111 ddddddddd ------110

LOCKSET D

Set lock number D[2..0]

ID = 0

Prior lock state

7..22 *

000011 0001 1111 ddddddddd ------111

LOCKCLR D

Clear lock number D[2..0]

ID = 0

Prior lock state

7..22 *

000100 001i 1111 ddddddddd sssssssss

MUL

D,S Multiply unsigned D[15..0] by S[15..0]

Result = 0

future

000101 001i 1111 ddddddddd sssssssss

MULS

D,S Multiply signed D[15..0] by S[15..0]

Result = 0

future

000110 001i 1111 ddddddddd sssssssss

ENC

D,S Encode magnitude of S into D, result = 0..31

Result = 0

future

000111 001i 1111 ddddddddd sssssssss

ONES

D,S Get number of 1's in S into D, result = 0..31

Result = 0

future

001000 001i 1111 ddddddddd sssssssss

ROR

D,S Rotate D right by S[4..0] bits

Result = 0

D[0]

001001 001i 1111 ddddddddd sssssssss

ROL

D,S Rotate D left by S[4..0] bits

Result = 0

D[31]

001010 001i 1111 ddddddddd sssssssss

SHR

D,S Shift D right by S[4..0] bits, set new MSB to 0

Result = 0

D[0]

001011 001i 1111 ddddddddd sssssssss

SHL

D,S Shift D left by S[4..0] bits, set new LSB to 0

Result = 0

D[31]

001100 001i 1111 ddddddddd sssssssss

RCR

D,S Rotate carry right into D by S[4..0] bits

Result = 0

D[0]

001101 001i 1111 ddddddddd sssssssss

RCL

D,S Rotate carry left into D by S[4..0] bits

Result = 0

D[31]

001110 001i 1111 ddddddddd sssssssss

SAR

D,S Shift D arithmetically right by S[4..0] bits

Result = 0

D[0]

001111 001i 1111 ddddddddd sssssssss

REV

D,S

Result = 0

D[0]

010000 001i 1111 ddddddddd sssssssss

MINS

D,S Set D to S if signed (D < S)

S=0

Signed (D < S)

010001 001i 1111 ddddddddd sssssssss

MAXS

D,S Set D to S if signed (D => S)

S=0

Signed (D < S)

010010 001i 1111 ddddddddd sssssssss

MIN

D,S Set D to S if unsigned (D < S)

S=0

Unsigned (D < S)

010011 001i 1111 ddddddddd sssssssss

MAX

D,S Set D to S if unsigned (D => S)

S=0

Unsigned (D < S)

010100 001i 1111 ddddddddd sssssssss

MOVS

D,S Insert S[8..0] into D[8..0]

Result = 0

010101 001i 1111 ddddddddd sssssssss

MOVD

D,S Insert S[8..0] into D[17..9]

Result = 0

010110 001i 1111 ddddddddd sssssssss

MOVI

D,S Insert S[8..0] into D[31..23]

Result = 0

010111 001i 1111 ddddddddd sssssssss

JMPRET

D,S Insert PC+1 into D[8..0] and set PC to S[8..0]

Result = 0

010111 000i 1111 --------- sssssssss

JMP

Result = 0

iiiiii zcri cccc ddddddddd sssssssss
000000 000i 1111 ddddddddd sssssssss

Instruction

Description

Read main memory word S[15..1] into D (0extended)

Reverse 32–S[4..0] bottom bits in D and 0extend

Set PC to S[8..0]
Page 22 of 37

R Clocks

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet
iiiiii zcri cccc ddddddddd sssssssss
010111 0011 1111 ????????? sssssssss

www.parallax.com

Instruction
CALL

Z Result

C Result

Like JMPRET, but assembler handles details

Description

Result = 0

R Clocks
1

Like JMP, but assembler handles details

Result = 0

010111 0001 1111 --------- ---------

RET

011000 000i 1111 ddddddddd sssssssss

TEST

D,S AND S with D to affect flags only

D=0

Parity of Result

011001 000i 1111 ddddddddd sssssssss

TESTN

D,S AND !S into D to affect flags only

Result = 0

Parity of Result

011000 001i 1111 ddddddddd sssssssss

AND

D,S AND S into D

Result = 0

Parity of Result

011001 001i 1111 ddddddddd sssssssss

ANDN

D,S AND !S into D

Result = 0

Parity of Result

011010 001i 1111 ddddddddd sssssssss

D,S OR S into D

Result = 0

Parity of Result

011011 001i 1111 ddddddddd sssssssss

XOR

D,S XOR S into D

Result = 0

Parity of Result

011100 001i 1111 ddddddddd sssssssss

MUXC

D,S Copy C to bits in D using S as mask

Result = 0

Parity of Result

011101 001i 1111 ddddddddd sssssssss

MUXNC

D,S Copy !C to bits in D using S as mask

Result = 0

Parity of Result

011110 001i 1111 ddddddddd sssssssss

MUXZ

D,S Copy Z to bits in D using S as mask

Result = 0

Parity of Result

011111 001i 1111 ddddddddd sssssssss

MUXNZ

D,S Copy !Z to bits in D using S as mask

Result = 0

Parity of Result

100000 001i 1111 ddddddddd sssssssss

ADD

D,S Add S into D

D+S=0

Unsigned Carry

100001 001i 1111 ddddddddd sssssssss

SUB

D,S Subtract S from D

D-S=0

Unsigned Borrow

100001 000i 1111 ddddddddd sssssssss

CMP

D,S Compare D to S

D=S

Unsigned (D < S)

100010 001i 1111 ddddddddd sssssssss

ADDABS

D,S Add absolute S into D

D + |S| = 0

Unsigned Carry

100011 001i 1111 ddddddddd sssssssss

SUBABS

D,S Subtract absolute S from D

D - |S| = 0

Unsigned Borrow 2

100100 001i 1111 ddddddddd sssssssss

SUMC

D,S Sum either –S if C or S if !C into D

D±S=0

Signed Overflow

100101 001i 1111 ddddddddd sssssssss

SUMNC

D,S Sum either S if C or –S if !C into D

D±S=0

Signed Overflow

100110 001i 1111 ddddddddd sssssssss

SUMZ

D,S Sum either –S if Z or S if !Z into D

D±S=0

Signed Overflow

100111 001i 1111 ddddddddd sssssssss

SUMNZ

D,S Sum either S if Z or –S if !Z into D

D±S=0

Signed Overflow

101000 001i 1111 ddddddddd sssssssss

MOV

D,S Set D to S

Result = 0

S[31]

101001 001i 1111 ddddddddd sssssssss

NEG

D,S Set D to –S

Result = 0

S[31]

101010 001i 1111 ddddddddd sssssssss

ABS

D,S Set D to absolute S

Result = 0

S[31]

101011 001i 1111 ddddddddd sssssssss

ABSNEG

D,S Set D to –absolute S

Result = 0

S[31]

101100 001i 1111 ddddddddd sssssssss

NEGC

D,S Set D to either –S if C or S if !C

Result = 0

S[31]

101101 001i 1111 ddddddddd sssssssss

NEGNC

D,S Set D to either S if C or –S if !C

Result = 0

S[31]

101110 001i 1111 ddddddddd sssssssss

NEGZ

D,S Set D to either –S if Z or S if !Z

Result = 0

S[31]

101111 001i 1111 ddddddddd sssssssss

NEGNZ

D,S Set D to either S if Z or –S if !Z

Result = 0

S[31]

110000 000i 1111 ddddddddd sssssssss

CMPS

D,S Compare-signed D to S

110001 000i 1111 ddddddddd sssssssss

CMPSX

D,S Compare-signed-extended D to S+C

110010 001i 1111 ddddddddd sssssssss

ADDX

110011 001i 1111 ddddddddd sssssssss
110011 000i 1111 ddddddddd sssssssss

D=S

Signed (D < S)

Z & (D = S+C)

Signed (D < S+C)

D,S Add-extended S+C into D

Z & (D+S+C = 0)

Unsigned Carry

SUBX

D,S Subtract-extended S+C from D

Z & (D-(S+C)=0) Unsigned Borrow

CMPX

D,S Compare-extended D to S+C

110100 001i 1111 ddddddddd sssssssss

ADDS

110101 001i 1111 ddddddddd sssssssss

Z & (D = S+C)

Signed (D < S+C)

D,S Add-signed S into D

D+S=0

Signed Overflow

SUBS

D,S Subtract-signed S from D

D-S=0

Signed Overflow

110110 001i 1111 ddddddddd sssssssss

ADDSX

D,S Add-signed-extended S+C into D

Z & (D+S+C = 0) Signed Overflow

110111 001i 1111 ddddddddd sssssssss

SUBSX

D,S Subtract-signed-extended S+C from D

Z & (D-(S+C)=0) Signed Overflow

111000 001i 1111 ddddddddd sssssssss

CMPSUB

D,S Subtract S from D if D => S

111001 001i 1111 ddddddddd sssssssss

DJNZ

D,S

111010 000i 1111 ddddddddd sssssssss

TJNZ

D,S

111011 000i 1111 ddddddddd sssssssss

TJZ

D,S Test D, jump if zero to S (no jump = 8 clocks)

111100 000i 1111 ddddddddd sssssssss

WAITPEQ D,S Wait for pins equal - (INA & S) = D

111101 000i 1111 ddddddddd sssssssss

D=S

Unsigned (D => S)

Dec D, jump if not zero to S (no jump = 8
clocks)

Result = 0

Unsigned Borrow

4 or 8

Test D, jump if not zero to S (no jump = 8
clocks)

D=0

4 or 8

D=0

4 or 8

WAITPNE D,S Wait for pins not equal - (INA & S) != D

111110 001i 1111 ddddddddd sssssssss

WAITCNT D,S Wait for CNT = D, then add S into D

Unsigned Carry

111111 000i 1111 ddddddddd sssssssss

WAITVID D,S Wait for video peripheral to grab D and S

------ ---- 0000 --------- ---------

NOP

No operation, just elapses 4 clocks

* See Hub, section 4.4 on page 7.
1. ADDABS C out: If S is negative, C = the inverse of unsigned borrow (for D-S).
2. SUBABS C out: If S is negative, C = the inverse of unsigned carry (for D+S).

Page 23 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

6.4.1.

www.parallax.com

Assembly Conditions

Condition

Instruction Executes

IF_ALWAYS

always

IF_NEVER

never

6.4.4. Assembly Operators
Propeller Assembly code can contain
expressions, which may use any operators
allowed in constant expressions. The table (a
Table 17) lists the operators allowed in
Assembly.

IF_E

if equal (Z)

IF_NE

if not equal (!Z)

IF_A

if above (!C & !Z)

IF_B

if below (C)

IF_AE

if above/equal (!C)

IF_BE

if below/equal (C | Z)

IF_C

if C set

IF_NC

if C clear

IF_Z

if Z set

IF_NZ

if Z clear

IF_C_EQ_Z

if C equal to Z

IF_C_NE_Z

if C not equal to Z

IF_C_AND_Z

if C set and Z set

IF_C_AND_NZ

if C set and Z clear

IF_NC_AND_Z

if C clear and Z set

IF_NC_AND_NZ

if C clear and Z clear

IF_C_OR_Z

if C set or Z set

IF_C_OR_NZ

if C set or Z clear

IF_NC_OR_Z

if C clear or Z set

IF_NC_OR_NZ

if C clear or Z clear

IF_Z_EQ_C

if Z equal to C

IF_Z_NE_C

if Z not equal to C

IF_Z_AND_C

if Z set and C set

IF_Z_AND_NC

if Z set and C clear

IF_NZ_AND_C

if Z clear and C set

IF_NZ_AND_NC

if Z clear and C clear

IF_Z_OR_C

if Z set or C set

IF_Z_OR_NC

if Z set or C clear

IF_NZ_OR_C

if Z clear or C set

IF_NZ_OR_NC

if Z clear or C clear

6.4.2.

Operator

+
+
*
**
/
//
#>
<#
^^
||
~>

Assembly Directives

Directive

Description

FIT 〈Address〉

Validate previous instr/data fit below an
address.
Adjust compile-time cog address
pointer.

ORG 〈Address〉

〈Symbol〉 RES 〈Count〉
6.4.3.
Effect

WC
WZ
WR
NR

Reserve next long(s) for symbol.

<<
>>
<->
><
&
|
^
!
AND
OR
NOT
==
<>
<
>
=<
=>
@

constant
that are
subset of
Propeller

Description
Add
Positive (+X); unary form of Add
Subtract
Negate (-X); unary form of Subtract
Multiply and return lower 32 bits (signed)
Multiply and return upper 32 bits (signed)
Divide (signed)
Modulus (signed)
Limit minimum (signed)
Limit maximum (signed)
Square root; unary
Absolute value; unary
Shift arithmetic right
Bitwise: Decode value (0-31) into single-high-bit
long; unary
Bitwise: Encode long into value (0 - 32) as highbit priority; unary
Bitwise: Shift left
Bitwise: Shift right
Bitwise: Rotate left
Bitwise: Rotate right
Bitwise: Reverse
Bitwise: AND
Bitwise: OR
Bitwise: XOR
Bitwise: NOT; unary
Boolean: AND (promotes non-0 to -1)
Boolean: OR (promotes non-0 to -1)
Boolean: NOT (promotes non-0 to -1); unary
Boolean: Is equal
Boolean: Is not equal
Boolean: Is less than (signed)
Boolean: Is greater than (signed)
Boolean: Is equal or less (signed)
Boolean: Is equal or greater (signed)
Symbol address; unary

Assembly Effects
Results In
C Flag modified
Z Flag modified
Destination Register modified
Destination Register not modified

Page 24 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

7.0

www.parallax.com

PROPELLER DEMO BOARD SCHEMATIC

The Propeller Demo Board (Stock #32100) provides convenient connections to 32K EEPROM, replaceable 5 MHz crystal,
3. 3V and 5 V regulators, USB-to-serial programming/communication interface, VGA and NTSC video output, stereo output
with 16 Ω headphone amplifier, microphone input, two PS2 mouse and keyboard jacks, eight LEDs, eight free I/O pins
brought to a header for breadboard for prototyping, and a ground post for an oscilloscope probe. Overall PCB size: 3" x 3".

Page 25 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

www.parallax.com

8.0

ELECTRICAL CHARACTERISTICS

8.1.

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress
ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the
remainder of Section 7.0. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability.
Table 18: Absolute Maximum Ratings
Ambient temperature under bias

-55 °C to +125 °C

Storage temperature

-65 °C to +150 °C
-0.3 V to +4.0 V

Voltage on Vdd with respect to Vss
Voltage on all other pins with respect to Vss

-0.3 V to (Vdd + 0.3 V)

Total power dissipation

Max. current out of Vss pins

300 mA

Max. current into Vdd pins

300 mA

Max. DC current into an input pin with internal protection diode forward biased

±500 µA

Max. allowable current per I/O pin

40 mA

ESD (Human Body Model) Supply pins

3 kV

ESD (Human Body Model) all non-supply pins

8 kV

8.2.

DC Characteristics

(Operating temperature range: -55° C < Ta < +125° C unless otherwise noted)
Symbol

Parameter

Conditions

Min

Supply Voltage

Vdd

2.7

0.6 Vdd
Vss

Logic High
Logic Low

Vih, Vil

Typ

Iil

Input Leakage Current

Vin = Vdd or Vss

-1.0

Voh

Output High Voltage

Ioh = 10 mA, Vdd = 3.3 V

2.85

Vol

Output Low Voltage

Iol = 10 mA, Vdd = 3.3 V

IBO

Brownout Detector Current

Quiescent Current

Max

Units

3.6

Vdd
0.3 Vdd

V
V

+1.0

µA
V

0.4

RESn = 0V, BOEn = Vdd, P0-P31=0V

3.8

µA

600

Note: Data in the Typical (“Typ”) column is Ta = 25 °C unless otherwise stated.

8.3.

AC Characteristics

(Operating temperature range: -55°C < Ta < +125°C unless otherwise noted)
Symbol
Fosc

Cin

Min

Typ

Max

Units

External XI Frequency

Parameter

MHz

Oscillator Frequency

DC
13
8
4

20
12
-

80
33
20
8
-

MHz
kHz
MHz
MHz

Input Capacitance

Condition
Direct drive (no PLL)
RCSLOW
RCFAST
Crystal using PLL

Note: Data in the Typical (“Typ”) column is Ta = 25 °C unless otherwise stated.

Page 26 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

www.parallax.com

9.0

CURRENT CONSUMPTION CHARACTERISTICS

9.1.

Typical Current Consumption of 8 Cogs

This figure shows the typical current consumption of the Propeller under various operating conditions duplicated across all
cogs. Brown out circuitry and the Phase-Locked Loop were disabled for the duration of the test. Current consumption is
substantially constant over the operational temperature range.
Current (A)
0

-1

-2

-3

-4

-5

-6

10
2

10
4

10
5

10
6
7

Typical Current Consumption of 8 cogs vs. Operating Frequency (3.3V, Ta = 25°C)

Spin Loops (REPEAT)

Assembly Loops (JMP)

WAIT(CNT/PEQ/PNE)

Hub Only

Frequency (Hz)

Page 27 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

9.2.

www.parallax.com

Typical Current of a Cog vs. Operating Frequency

This graph shows a cog’s typical current consumption under various conditions, in isolation of other sources of current within
the Propeller chip.
Typical Current of a Cog vs. Operating Frequency (Vdd = 3.3 V, Ta = 25° C)
14
Spin Loop (REPEAT)
Assembly Loop (JMP)

WAIT(CNT/PEQ/PNE)

Current (mA)

0
0

100

Frequency (MHz)

9.3.

Typical PLL Current vs. VCO Frequency

This graph shows the typical amount of current consumed by a Phase-Locked Loop as a function of the frequency of the
Voltage Controlled Oscillator which is 16 times the frequency of the input clock.

Typical PLL Current vs. VCO Frequency (Vdd = 3.3 V, Ta = 25° C)
1.4
1.3
1.2

Current (mA)

1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
20

100

120

140

160

Frequency (MHz)

Page 28 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

9.4.

www.parallax.com

Typical Crystal Drive Current

This graph shows the current consumption of the crystal driver over a range of crystal frequencies and crystal settings, all
data points above 25 MHz were obtained by using a resonator since the driver does not perform 3rd harmonic overtone
driving required for crystals over 25 MHz.

Typical Crystal Drive Current (Vdd = 3.3 V, Ta = 25° C)
1.4
xtal1
xtal2
1.2

xtal3

Current (mA)

1.0

0.8

0.6

0.4

0.2
0

Frequency (MHz)

9.5.

Cog and I/O Pin Relationship

The figure below illustrates the physical relationship between the cogs and I/O pins. While there can be a 1 to 1.5 ns
propagation delay in output transitions between the shortest and longest paths, the purpose of the figure is to illustrate the
length of leads and their associated parasitic capacitance. This capacitance increases the amount of energy required to
transition a pin’s state and therefore increases the current draw for toggling a pin. So, the current consumed by Cog 7
toggling P0 at 20 MHz will be greater than Cog 0 toggling P7 at 20 MHz. The amount of current consumed by transitioning a
pin’s state is dependent on many factors including: temperature, frequency of transitions, external load, and internal load. As
mentioned, the internal load is dependent upon which cog and pin are used. Internal load current for room temperature
toggling of a pin at 20 MHz for a Propeller in a DIP package varies on the order of 300 µA.
P0
P31
P5
P26

P6
P7

cog 0

cog 1

cog 2

cog 3

cog 4

cog 5

cog 6

cog 7

P25
P24

P8
P9

P23

P10

P22
P21

P15
P16

Page 29 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

9.6.

www.parallax.com

Current Profile at Various Startup Conditions

The diagrams below show the current profile for various startup conditions of the Propeller chip dependent upon the presence
of an EEPROM and PC.

Figure 9
Boot Sequence Current Profile for
no PC and no EEPROM (P31
held low and P29 not connected
(same as held low)).

Figure 10
Boot Sequence Current Profile for
PC (connected but idle) and no
EEPROM. (P31 held high and
P29 not connected).

Figure 11
Boot Sequence Current Profile for
no PC and no EEPROM (P31
held low and P29 held high).

Figure 12
Boot Sequence Current Profile for
no PC and EEPROM (P31 held
low and P29 connected to
EEPROM SDA).

Figure 13
Boot Sequence Current Profile for
PC (connected but idle) and
EEPROM (P31 held high and P29
connected to EEPROM SDA).

Page 30 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

www.parallax.com

10.0 TEMPERATURE CHARACTERISTICS
10.1.

Internal Oscillator Frequency as a Function of Temperature

While the internal oscillator frequency is variable due to process variation, the rate of change as a function of temperature
when normalized provides a chip invariant ratio which can be used to calculate the oscillation frequency when the ambient
temperature is other than 25 °C (the temperature to which the graph was normalized). The absolute frequency at 25 °C varied
from 13.26 to 13.75 MHz in the sample set. The section of the graph which has a white background is the military range of
temperature; the sections in grey represent data which is beyond military temperature specification.

Page 31 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

10.2.

www.parallax.com

Fastest Operating Frequency as a Function of Temperature

The following graph represents a small sample average of a Propeller chip’s fastest operating range. The test was performed
in a forced air chamber using code run on all eight cogs, multiple video generators, and counter modules. A frequency was
considered successful if the demo ran without fault for one minute. The curves represent an aggressive testing procedure
(averaged, forced air, one minute time limit); therefore the designer must de-rate the curve to arrive at a stable frequency for a
particular application. Again the grayed regions represent temperatures beyond the military temperature range.

Page 32 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

10.3.

www.parallax.com

Current Consumption as a Function of Temperature

The following graph demonstrates the current consumption of the Propeller as a function of temperature. It is clear from the
graph that current consumption is nearly independent of temperature over the entire military temperature range.

Current Consumption vs Temperature
90

80
Spin
Waitloop
Assembly
waitloop
Spin

Current (mA)

0
-40

-20

100

120

Temperature (C)

Page 33 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

www.parallax.com

11.0 PACKAGE DIMENSIONS
11.1.

P8X32A-D40 (40-pin DIP)

Page 34 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

11.2.

www.parallax.com

P8X32A-Q44 (44-pin LQFP)

Page 35 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

11.3.

www.parallax.com

P8X32A-M44 (44-pin QFN)

Page 36 of 37

Rev 1.2 4/24/2009

Propeller™ P8X32A Datasheet

www.parallax.com

12.0 MANUFACTURING INFO

13.0 REVISION HISTORY

12.1.

13.1.1. Changes for Version 1.1:
Section 11.3: P8X32A-M44 (44-pin QFN). Image
replaced to add stencil pattern diagram. New section
inserted: 4.8 Assembly Instruction Execution Stages.
Contact Information updated.

12.2.

Reflow Peak Temperature
Package Type

Reflow Peak Temp.

DIP

255+5/-0 °C

LQFP

255+5/-0 °C

QFN

255+5/-0 °C

Green/RoHS Compliance

All Parallax Propeller chip models are certified
Green/RoHS Compliant. The Certificate of Compliance
is available upon request and may be obtained by
contacting the Parallax Sales Team.

13.1.2. Changes for Version 1.2:
Section 6.4: Modified table entries for ADD, ADDABS, ADDS,
ADDSX, ADDX, CMP, CMPS, CMPSX, CMPX, COGID, COGINIT,
COGSTOP, LOCKCLR, LCOKNEW, LOCKRET, LOCKSET, MAX,
MAXS, MIN, MINS, SUB, SUBABS, SUBS, SUBSX, SUBX, SUMC,
SUMNC, SUMNZ, SUMZ, TEST, TJNZ, TJZ. Section 4.5
updated. Section 5.1: new sentence added at end of
paragraph. Section 5.2: new sentence added at end of first
paragraph.

Parallax Sales and Tech Support Contact Information
For the latest information on Propeller chips and programming tools, development boards, instructional materials, and
application examples, please visit www.parallax.com/propeller.
Parallax, Inc.
599 Menlo Drive
Rocklin, CA 95765
USA
Phone: (916) 624-8333

Fax: (916) 624-8003
Sales: 1-888-512-1024
Tech Support: 1-888-997-8267
Sales: sales@parallax.com

Page 37 of 37

Tech Support:
support@parallax.com
Web: http://forums.parallax.com
Object Exchange:
http://obex.parallax.com

Rev 1.2 4/24/2009

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Company                         : Parallax Inc.
Source Modified                 : D:20090424165723
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Modify Date                     : 2009:04:24 10:05:56-07:00
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Format                          : application/pdf
Creator                         : Parallax Inc.
Title                           : Propeller Datasheet Version 1.2
Description                     : P8X32A 8-processor multicore microcontroller datasheet
Subject                         : cogs multicore multiprocessor microcontroller propeller parallax spin
Headline                        : P8X32A multiprocessor microcontroller datasheet
Page Count                      : 37
Page Layout                     : OneColumn
Author                          : Parallax Inc.
Keywords                        : cogs, multicore, multiprocessor, microcontroller, propeller, parallax, spin

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