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Cx51
8051/251 Development Tools
www.keil.com
The Keil Cx51 ANSI C Complier supports all classic
and extended 8051 device variants. Compiler
extensions provide full access to all CPU resources
and support up to 16MB memory. The Keil Cx51
generates code with the efficiency and speed of
hand-optimized assembly. New compiler and linker
optimizations shrink programs into the smallest
single-chip devices.
The Keil µVision4 IDE fully integrates Cx51 Version 9
and provides control of the Compiler, Assembler,
Real-Time OS, Project Manager, and Debugger in a
single, intelligent environment. With support for all
8051 devices and full compatibility with emulators
and third-party tools, Keil Cx51 is clearly the best
choice for your 8051 project.
To start your project, just select the device from the µVision Device Database.
For the selected device, µVision Debugger provides dialogs with detailed
peripheral information that are available with simulation and target debugging.
Keil Cx51 is the unsurpassed industry standard 8051
C Compiler. 10 optimization levels give you the ability to
put more features into less memory space and provide
the utmost code density for cost-sensitive single-chip
designs.
Using level 10 with the LX51 Extended Linker optimizes
a complete application. LX51 creates sub-routines for
common code blocks and replaces LJMP/LCALL
instructions with shorter AJMP/ACALL instructions
wherever possible.
0%
25%
50%
75%
100%
6 7 8 9 10
Optimize Level
Code Size Optimization
Large Model - Code Banking
Cx51
Supports all 8051 Variants
Up to 16MB Memory
Easy-to-use IDE Supports
Complete Development Cycle
Complete Device Support
Including Peripheral Simulation
Drivers for Flexible Debugging
in Target Hardware
-22%
2 Keil 8051/25 Development Tools1 Keil 8051/251 Development Tools 3
Program Debugging
Development Tools Overview
RTX Tiny2 Real-Time Kernel
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The RTX Tiny2 multi-tasking real-time kernel makes
implementing complex, time-critical software projects easy. RTX
Tiny2 is royalty-free and is fully integrated into the Keil Cx51
tool chain. It works on all classic 8051 device variants, and
supports multiple DPTR and arithmetic units.
RTX Tiny2 is the successor of the popular RTX operating
system and provides:
Single chip and code banking support
Round robin and cooperative task switching
Task management with create and delete
Timeout, Signal, and Ready events for task switching
Interrupt support for sending signals to tasks
Cx51 Compiler Highlights
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n
n
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Support for all 8051 derivatives and variants
Fast 32-bit IEEE floating-point math
Efficient interrupt code and direct register bank control
Bit-addressable objects
Sophisticated syntax checking and detailed warnings
Use of AJMP and ACALL instructions
Memory banking for code and variables beyond 64KB
Register parameters and dynamic register variables
Global program-wide register optimization
Common code block sub-routine optimization
Use of multiple data pointers
Use of on-chip arithmetic units
Generic and memory-specific pointers
Re-entrant functions and register bank independent code
Extensive debug and source browse information
Simple assembly language interface
The µVision debugger includes a kernel-aware dialog for RTX Tiny2 that displays
complete information about all the tasks in your program.
Cx51 Compiler
n
n
n
or flexible memory usage,
n
n
n
LX51 Extended Linker
The standard Code Banking Linker lets you increase the
program space of a classic 8051 device beyond 64KB. The LX51
Extended Linker expands device support and adds further
functionality to the Keil Cx51 Compiler:
n
Linker Code Packing analyzes an entire application and
generates sub-routines for common code blocks even on
code banking applications. Short AJMP and ACALL
instructions replace longer LJMP and LCALL when possible
n
Incremental Linkage allows you to split programs into
several functional parts as it is required for multi-application
programming or FLASH ROM updates
n
Far Memory Support gives you access to 16MB of
variable space even on a classic 8051 device and the far
memory type may be used for special memory types
n
Detailed Data Type Checking is performed across all
public symbol definitions and improves software quality
The Keil 8051 and 251 development kits contain different C
Compilers for optimum support of device variants. Cx51 is
used as a generic term for:
C51 Compiler for classic 8051 devices, 8051 IP cores, Dallas
Contiguous Mode, and other extended devices
CX51 Compiler for Philips 8051 MX and SmartMX
C251 Compiler for 251 devices and 251 IP cores
The Cx51 Compiler gives complete access to all hardware
components within your C source code. For example, you can
control peripherals using SFR registers, write optimum interrupt
code with CPU register banks, accelerate variable access with
the data, idata, or pdata memory type, and use efficient bit
operations or atomic bit manipulation.
8051 devices provide various physical memory spaces: fast
DATA space, up to 16MB large XDATA space, and CODE space
for constants. F Cx51 offers:
Three well-defined memory models that provide the default
memory allocation for variables
Generic pointers that access all memory spaces
Memory types that control the space for variables or pointer
accesses. Memory-specific pointers reduce RAM
requirements, and optimize program execution
µVision Debugger
The µVision Debugger provides source-level debugging and
includes traditional features like simple and complex
breakpoints, watch windows, and execution control as well as
sophisticated features like performance analyzer, code coverage,
and logic analyzer.
The µVision Debugger may be configured as a Simulator where
programs run on your PC; or as Target Debugger where
programs run on your target hardware.
The cycle-accurate µVision Simulator is a software-only product
that simulates most features of your 8051/251 device without
actually having target hardware. µVision simulates a wide range
of peripherals including I/O Ports, CAN, I²C, SPI, UART, A/D
and D/A converter, E²PROM, and interrupt controller. The
simulated peripherals depend on the device selected from the
µVision Device Database.
Benefits of µVision Device Simulation
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n
n
n
n
n
n
Simulation allows software testing on your desktop with
no hardware environment
Early software debugging on a functional basis improves
overall software reliability
Simulation allows breakpoints that are not possible with
hardware debuggers
Simulation allows for optimal input signals (hardware
debuggers add extra noise)
Signal functions are easily programmed to reproduce
complex, real-world input signals
Single-stepping through signal processing algorithms is
possible. External signals stop when the CPU halts
It is easy to test failure scenarios that would destroy real
hardware peripherals
The µVision development platform is easy to use and it helps you to quickly create embedded programs that work. The µVision editor and debugger are integrated in a single
application that provides a seamless embedded project development environment for editing, simulating, Flash programming and testing in target hardware.
The disassembly window
shows CPU instructions
and trace history
Peripheral dialogs display
status information and aid
in driver development
The Performance Analyzer
displays execution times
for program blocks
Memory and watch
windows display program
variables
The Logic Analyzer shows
changes to variables and
signals over time
The Project Window shows
all project files, and helps
you manage your project
2 Keil 8051/25 Development Tools1 Keil 8051/251 Development Tools 3
Program Debugging
Development Tools Overview
RTX Tiny2 Real-Time Kernel
n
n
n
n
n
The RTX Tiny2 multi-tasking real-time kernel makes
implementing complex, time-critical software projects easy. RTX
Tiny2 is royalty-free and is fully integrated into the Keil Cx51
tool chain. It works on all classic 8051 device variants, and
supports multiple DPTR and arithmetic units.
RTX Tiny2 is the successor of the popular RTX operating
system and provides:
Single chip and code banking support
Round robin and cooperative task switching
Task management with create and delete
Timeout, Signal, and Ready events for task switching
Interrupt support for sending signals to tasks
Cx51 Compiler Highlights
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
Support for all 8051 derivatives and variants
Fast 32-bit IEEE floating-point math
Efficient interrupt code and direct register bank control
Bit-addressable objects
Sophisticated syntax checking and detailed warnings
Use of AJMP and ACALL instructions
Memory banking for code and variables beyond 64KB
Register parameters and dynamic register variables
Global program-wide register optimization
Common code block sub-routine optimization
Use of multiple data pointers
Use of on-chip arithmetic units
Generic and memory-specific pointers
Re-entrant functions and register bank independent code
Extensive debug and source browse information
Simple assembly language interface
The µVision debugger includes a kernel-aware dialog for RTX Tiny2 that displays
complete information about all the tasks in your program.
Cx51 Compiler
n
n
n
or flexible memory usage,
n
n
n
LX51 Extended Linker
The standard Code Banking Linker lets you increase the
program space of a classic 8051 device beyond 64KB. The LX51
Extended Linker expands device support and adds further
functionality to the Keil Cx51 Compiler:
n
Linker Code Packing analyzes an entire application and
generates sub-routines for common code blocks even on
code banking applications. Short AJMP and ACALL
instructions replace longer LJMP and LCALL when possible
n
Incremental Linkage allows you to split programs into
several functional parts as it is required for multi-application
programming or FLASH ROM updates
n
Far Memory Support gives you access to 16MB of
variable space even on a classic 8051 device and the far
memory type may be used for special memory types
n
Detailed Data Type Checking is performed across all
public symbol definitions and improves software quality
The Keil 8051 and 251 development kits contain different C
Compilers for optimum support of device variants. Cx51 is
used as a generic term for:
C51 Compiler for classic 8051 devices, 8051 IP cores, Dallas
Contiguous Mode, and other extended devices
CX51 Compiler for Philips 8051 MX and SmartMX
C251 Compiler for 251 devices and 251 IP cores
The Cx51 Compiler gives complete access to all hardware
components within your C source code. For example, you can
control peripherals using SFR registers, write optimum interrupt
code with CPU register banks, accelerate variable access with
the data, idata, or pdata memory type, and use efficient bit
operations or atomic bit manipulation.
8051 devices provide various physical memory spaces: fast
DATA space, up to 16MB large XDATA space, and CODE space
for constants. F Cx51 offers:
Three well-defined memory models that provide the default
memory allocation for variables
Generic pointers that access all memory spaces
Memory types that control the space for variables or pointer
accesses. Memory-specific pointers reduce RAM
requirements, and optimize program execution
µVision Debugger
The µVision Debugger provides source-level debugging and
includes traditional features like simple and complex
breakpoints, watch windows, and execution control as well as
sophisticated features like performance analyzer, code coverage,
and logic analyzer.
The µVision Debugger may be configured as a Simulator where
programs run on your PC; or as Target Debugger where
programs run on your target hardware.
The cycle-accurate µVision Simulator is a software-only product
that simulates most features of your 8051/251 device without
actually having target hardware. µVision simulates a wide range
of peripherals including I/O Ports, CAN, I²C, SPI, UART, A/D
and D/A converter, E²PROM, and interrupt controller. The
simulated peripherals depend on the device selected from the
µVision Device Database.
Benefits of µVision Device Simulation
n
n
n
n
n
n
n
Simulation allows software testing on your desktop with
no hardware environment
Early software debugging on a functional basis improves
overall software reliability
Simulation allows breakpoints that are not possible with
hardware debuggers
Simulation allows for optimal input signals (hardware
debuggers add extra noise)
Signal functions are easily programmed to reproduce
complex, real-world input signals
Single-stepping through signal processing algorithms is
possible. External signals stop when the CPU halts
It is easy to test failure scenarios that would destroy real
hardware peripherals
The µVision development platform is easy to use and it helps you to quickly create embedded programs that work. The µVision editor and debugger are integrated in a single
application that provides a seamless embedded project development environment for editing, simulating, Flash programming and testing in target hardware.
The disassembly window
shows CPU instructions
and trace history
Peripheral dialogs display
status information and aid
in driver development
The Performance Analyzer
displays execution times
for program blocks
Memory and watch
windows display program
variables
The Logic Analyzer shows
changes to variables and
signals over time
The Project Window shows
all project files, and helps
you manage your project
PK51
Professional Developer’s Kit
RTX Tiny2 RTOS Kernel
Examples and Templates
Keil Cx51 Compiler
Device Peripheral Simulation
µVision
Device Database & IDE
µVision
Debugger & Analysis Tools
Keil 8051/251 Development Tools
All brand names or product names are the property of their respective holders. Neither the whole nor any part of the information contained in, or the product described in, this document may be adapted or reproduced in any material form except with the prior
written permission of the copyright holder. The product described in this document is subject to continuous developments and improvements. All particulars of the product and its use contained in this document are given in good faith. All warranties implied or
expressed, including but not limited to implied warranties of satisfactory quality or fitness for purpose are excluded. This document is intended only to provide information to the reader about the product. To the extent permitted by local laws ARM shall not be liable
for any loss or damage arising from the use of any information in this document or any error or omission in such information.
Program examples and detailed technical information are available from your distributor and our web site (www.keil.com).
www.keil.com Keil 8051/251 | 01.11
Europe: +49 89/45 60 40 - 20 sales.intl@keil.com support.intl@keil.com
United States: +1 800 348 8051 sales.us@keil.com support.us@keil.com
The Keil PK51 Professional Developer’s Kit is a complete
software development environment for classic and extended
8051 microcontrollers. It includes the tools you need to create,
translate, and debug C and Assembly source files. Keil PK51 is
easy to learn and use, yet powerful enough for the most
demanding 8051 applications.
The integrated Device Database configures the tools options
for each specific microcontroller. For a complete list of
supported devices, refer to
®
www.keil.com/dd.
Keil
Monitor-51 for evaluation boards and target hardware
MON390 for devices running in Dallas contiguous mode
ISD51 in-system debugger runs on standard 8051 hardware
and is linked with the user application
EPM900 emulator/programmer for Philips LPC900 device
series
FlashMON for Atmel single-chip microcontrollers
MONADI for Analog Devices MicroConverter
ULINK2 driver for Infineon XC800, NXP 952/954, and
STMicroelectronics µPSD3000 devices
Other target hardware is supported by third-party drivers.
µVision combines project management, source editing,
program debugging, and accurate device simulation in a single
powerful environment. Multiple drivers are included for
debugging applications running on target hardware.
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The Keil ULINK2 Debug Adapter connects to a wide range of evaluation boards. For
more information refer to www.keil.com/ulink
