PIC18F87J50 FS USB Plug In Module User's Guide Users

PIC18F87J50_FS_USB%20Users%20Guide

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Table of Contents
Preface
Chapter 1. Introduction and Overview
Chapter 2. Important Notes and Migration Tips
Chapter 3. Hardware Configuration/Jumper Settings
Chapter 4. Demo Code/Reference Firmware
Appendix A. PIC18F87J50 FS USB Plug-In Module Schematics
- A.1 Schematics
  - Figure A-1: PIC18F87J50 FS USB PIM Rev. 1 Schematics (Sheet 1 of 2)
  - Figure A-2: PIC18F87J50 FS USB PIM Rev. 1 Schematics (Sheet 2 of 2)
Index
Worldwide Sales and Service

PIC18F87J50 FS USB

Plug-In Module

User’s Guide

Information contained in this publication regarding device

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and may be superseded by updates. It is your responsibility to

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intended manner and under normal conditions.

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and manufacture of development systems is ISO 9001:2000 certified.

PIC18F87J50 FS USB

PLUG-IN MODULE

USER’S GUIDE

Table of Contents

Preface ........................................................................................................................... 1

Chapter 1. Introduction and Overview ......................................................................... 5

1.1 Introduction ..................................................................................................... 5

1.2 Highlights ........................................................................................................ 5

1.3 PIC18F87J50 FS USB Plug-In Module Kit Contents ...................................... 5

1.4 Overview of the PIC18F87J50 Family USB Capabilities ................................ 6

1.5 Using the Preprogrammed Firmware ............................................................. 6

Chapter 2. Important Notes and Migration Tips .......................................................... 7

2.1 Highlights ........................................................................................................ 7

2.2 Using the PIM with the HPC Explorer Board .................................................. 7

2.3 Programming the Microcontroller ................................................................... 8

2.4 Migrating to the PIC18F87J50 Family ............................................................ 8

Chapter 3. Hardware Configuration/Jumper Settings .............................................. 11

3.1 Highlights .......................................................................................................11

3.2 Hardware Features ........................................................................................11

3.3 Crystal .......................................................................................................... 12

3.4 Linear Regulator/Power Management .......................................................... 13

3.5 LEDs ............................................................................................................. 14

3.6 Push Buttons ................................................................................................ 14

3.7 Jumpers ........................................................................................................ 14

3.8 Hardware Considerations for Compliance Testing ....................................... 15

Chapter 4. Demo Code/Reference Firmware ............................................................. 17

Appendix A. PIC18F87J50 FS USB Plug-In Module Schematics ............................. 19

A.1 Schematics .................................................................................................. 19

Index ............................................................................................................................. 23

Worldwide Sales and Service .................................................................................... 24

PIC18F87J50 FS USB Plug-In Module User’s Guide

NOTES:

PIC18F87J50 FS USB

PLUG-IN MODULE

USER’S GUIDE

Preface

INTRODUCTION

This chapter contains general information that will be useful to know before using the

PIC18F87J50 FS USB Plug-In Module. Items discussed in this chapter include:

• Document Layout

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Web Site

• Development Systems Customer Change Notification Service

• Customer Support

• Document Revision History

DOCUMENT LAYOUT

This document describes how to use the PIC18F87J50 FS USB Plug-In Module. The

manual layout is as follows:

•Chapter 1. “Introduction and Overview”

•Chapter 2. “Important Notes and Migration Tips”

•Chapter 3. “Hardware Configuration/Jumper Settings”

•Chapter 4. “Demo Code/Reference Firmware”

•Appendix A. “PIC18F87J50 FS USB Plug-In Module Schematics”

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and

documentation are constantly evolving to meet customer needs, so some actual dialogs

and/or tool descriptions may differ from those in this document. Please refer to our web site

(www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each

page, in front of the page number. The numbering convention for the DS number is

“DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the

document.

For the most up-to-date information on development tools, see the MPLAB® IDE on-line help.

Select the Help menu, and then Topics to open a list of available on-line help files.

PIC18F87J50 FS USB Plug-In Module User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB® IDE User’s Guide

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog

A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

“Save project before build”

Underlined, italic text with

right angle bracket

A menu path File>Save

Bold characters A dialog button Click OK

A tab Click the Power tab

N‘Rnnnn A number in verilog format,

where N is the total number of

digits, R is the radix and n is a

digit.

4‘b0010, 2‘hF1

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Filenames autoexec.bat

File paths c:\mcc18\h

Keywords _asm, _endasm, static

Command-line options -Opa+, -Opa-

Bit values 0, 1

Constants 0xFF, ‘A’

Italic Courier New A variable argument file.o, where file can be

any valid filename

Square brackets [ ] Optional arguments mcc18 [options] file

[options]

Curly brackets and pipe

character: { | }

Choice of mutually exclusive

arguments; an OR selection

errorlevel {0|1}

Ellipses... Replaces repeated text var_name [,

var_name...]

Represents code supplied by

user

void main (void)

{ ...

}

Preface

RECOMMENDED READING

This user's guide describes how to use PIC18F87J50 FS USB Plug-In Module. Other

useful documents are listed below. The following Microchip documents are available

and recommended as supplemental reference resources.

PIC18F87J50 Family Data Sheet (DS39775)

MCHPFSUSB Firmware User’s Guide (DS51679)

PICDEM™ FS USB Demonstration Board User’s Guide (DS51526)

USB related application notes, firmware and other resources will be posted at the

Microchip full-speed USB design center:

http://www.microchip.com/usb/ (click on the “Full-Speed USB Solutions” link)

Schematics and other support materials for the HPC Explorer board can be obtained at:

http://www.microchip.com/HPCExplorer

In addition to Microchip documents, the official USB 2.0 specifications are of particular

interest. These can be obtained from the USB Implementer’s Forum:

http://www.usb.org

Chapter 9 of the official USB 2.0 specifications is especially important, as it strongly

influences the development of USB firmware.

THE MICROCHIP WEB SITE

Microchip provides online support via our web site at www.microchip.com. This web

site is used as a means to make files and information easily available to customers.

Accessible by using your favorite Internet browser, the web site contains the following

information:

•Product Support – Data sheets and errata, application notes and sample

programs, design resources, user’s guides and hardware support documents,

latest software releases and archived software

•General Technical Support – Frequently Asked Questions (FAQs), technical

support requests, online discussion groups, Microchip consultant program

member listing

•Business of Microchip – Product selector and ordering guides, latest Microchip

press releases, listing of seminars and events, listings of Microchip sales offices,

distributors and factory representatives

PIC18F87J50 FS USB Plug-In Module User’s Guide

DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE

Microchip’s customer notification service helps keep customers current on Microchip

products. Subscribers will receive e-mail notification whenever there are changes,

updates, revisions or errata related to a specified product family or development tool of

interest.

To register, access the Microchip web site at www.microchip.com, click on Customer

Change Notification and follow the registration instructions.

The Development Systems product group categories are:

•Compilers – The latest information on Microchip C compilers and other language

tools. These include the MPLAB C18 and MPLAB C30 C compilers; MPASM™

and MPLAB ASM30 assemblers; MPLINK™ and MPLAB LINK30 object linkers;

and MPLIB™ and MPLAB LIB30 object librarians.

•Emulators – The latest information on Microchip in-circuit emulators.This

includes the MPLAB ICE 2000 and MPLAB ICE 4000.

•In-Circuit Debuggers – The latest information on the Microchip in-circuit

debugger, MPLAB ICD 2.

•MPLAB® IDE – The latest information on Microchip MPLAB IDE, the Windows®

Integrated Development Environment for development systems tools. This list is

focused on the MPLAB IDE, MPLAB SIM simulator, MPLAB IDE Project Manager

and general editing and debugging features.

•Programmers – The latest information on Microchip programmers. These include

the MPLAB PM3 and PRO MATE® II device programmers and the PICSTART®

Plus and PICkit™ 1 development programmers.

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

Customers should contact their distributor, representative or field application engineer

(FAE) for support. Local sales offices are also available to help customers. A listing of

sales offices and locations is included in the back of this document.

Technical support is available through the web site at: http://support.microchip.com

DOCUMENT REVISION HISTORY

Revision A (July 2007)

• Initial Release of this Document.

PIC18F87J50 FS USB

PLUG-IN MODULE

USER’S GUIDE

Chapter 1. Introduction and Overview

1.1 INTRODUCTION

The PIC18F87J50 FS USB Plug-In Module (PIM) Demonstration Board and Kit is

designed as an easy-to-use evaluation platform for Microchip's Full-Speed USB

PIC18F87J50 family of microcontrollers. The PIM may be operated either stand-alone,

or in conjunction with the HPC Explorer board (microchipDIRECT part number

DM183022).

These devices fully support USB 2.0 full-speed and low-speed serial communications

at signaling speeds of 12 Mbit/s or 1.5 Mbit/s. The demonstration kit provides all of the

hardware and software needed to develop officially compliant USB communication

solutions.

1.2 HIGHLIGHTS

Items discussed in this chapter include:

• PIC18F87J50 FS USB Plug-In Module Kit Contents

• Overview of the PIC18F87J50 Family USB Capabilities

• Using the Preprogrammed Firmware

1.3 PIC18F87J50 FS USB PLUG-IN MODULE KIT CONTENTS

The Demonstration Kit contains the following items:

1. The PIC18F87J50 FS USB Plug-In Module demonstration board,

preprogrammed with USB Human Interface Device (HID) class mouse

demonstration firmware.

2. A standard USB mini-B cable for power and communication.

3. The PICDEM™ FS USB Starter Kit CD-ROM, containing USB firmware projects,

Microchip's custom class USB driver and USB-specific documentation, such as

this user's guide.

PIC18F87J50 FS USB Plug-In Module User’s Guide

1.4 OVERVIEW OF THE PIC18F87J50 FAMILY USB CAPABILITIES

The PIC18F87J50 microcontroller is the “superset” device in the PIC18F87J50 micro-

controller family. The PIC18F87J50 has the highest memory and pin count in the family,

but otherwise shares an identical feature set (except features which require pins not

present on 64-pin devices) compared to the other devices. All of the devices in the fam-

ily are code-compatible with each other and share the same USB capabilities:

• USB 2.0 compliance

• Full-speed (12 Mbit/s) and low-speed (1.5 Mbit/s) operation

• Support of control, interrupt, bulk and isochronous transfers

• Support of up to 32 endpoints

• 3.9 Kbytes of dual access RAM for USB or general purpose use

• On-chip features for a single chip USB implementation, including:

- USB Serial Interface Engine (SIE)

- USB transceiver

- USB pull-up resistors

- D+ and D- driver output impedance matching resistors

1.5 USING THE PREPROGRAMMED FIRMWARE

The PIC18F87J50 FS USB Plug-In Module comes preprogrammed with HID class

firmware. Upon plugging in the USB cable to a Windows® operating system based host

PC, the device should automatically enumerate as a HID class mouse. The mouse

cursor should promptly begin moving around in a continuous circular pattern, and the

red LEDs on the PIM should begin blinking in an alternate manner. To stop the mouse

cursor from moving, simply press the “S4” push button located in the lower right corner

of the PIM. If the LEDs fail to illuminate, the device fails to enumerate or the mouse

does not move in a circle, verify that jumpers, JP4 and JP5, are installed. See

Figure 3-1 for the locations of these components.

PIC18F87J50 FS USB

PLUG-IN MODULE

USER’S GUIDE

Chapter 2. Important Notes and Migration Tips

2.1 HIGHLIGHTS

This chapter discusses:

• Using the PIM with the HPC Explorer Board

• Programming the Microcontroller

• Migrating to the PIC18F87J50 Family

2.2 USING THE PIM WITH THE HPC EXPLORER BOARD

If the PIM will be used with the HPC Explorer board, be sure to set switch, S3, on the

HPC Explorer to the “ICE” position PRIOR TO INSTALLING THE PIM. When the

switch is in the ICE position, the MCLR line on the PIC18F8722 microcontroller, located

on the HPC Explorer, will be held low. Additionally, VDD will not be connected to the

PIC18F8722. This is intended to prevent simultaneous code execution on both the

microcontroller located on the HPC Explorer board and on the PIM. Almost all of the

I/O pins on the PIM are directly connected to the same I/O pins on the PIC18F8722 of

the HPC Explorer board. For example, when the two boards are connected together,

microcontroller pin, RD0 on the PIC18F87J50 FS USB PIM, is directly connected to the

RD0 pin on the PIC18F8722, as well as one of the green LEDs on the HPC Explorer

board.

If both microcontrollers could execute code simultaneously, I/O pins configured as out-

puts could easily result in I/O pin contention and possible device damage. To prevent

this potential condition, the S3 switch on the HPC Explorer board should always be in

the “ICE” position when a PIM is installed.

The “P4” pin on the PIC18F87J50 FS USB Plug-In Module is intended to physically

interfere with switch, S3, on the HPC Explorer board. If the switch is not in the correct

position, the PIM will not sit fully seated. To avoid physically damaging the PIM or the

HPC Explorer board, never use excessive force when installing the PIM, and always

check that switch S3 on the HPC Explorer board is in the correct position.

The PIC18F87J50 FS USB PIM has been specifically designed to work either

stand-alone or while plugged into the HPC Explorer board, revision 5. HPC Explorer

revision 4 boards will also work, although capacitor, C3, may be too tall to allow the PIM

to sit fully seated. The interference should not be enough to prevent electrical con-

nectivity, but if it does, it is recommended to replace C3 with a physically smaller

capacitor. The HPC Explorer revision number can be found etched in the copper on the

bottom side of the PCB just underneath the 9-pin serial port connector.

PIC18F87J50 FS USB Plug-In Module User’s Guide

2.3 PROGRAMMING THE MICROCONTROLLER

The PIC18F87J50 microcontroller located on the PIM may be reprogrammed in excess

of 10,000 cycles. The PIM is too small to feature a full size RJ11 jack used on most

Microchip demonstration boards. Instead, the PIM uses a 6-pin right angle male header

(J5) which is electrically compatible with common Microchip programmers, such as the

MPLAB® ICD 2 and the MPLAB REAL ICE™ in-circuit emulator.

When the PIM is mated to the HPC Explorer board, it may be reprogrammed and

debugged directly through the modular RJ11 jack found on the HPC Explorer board.

When operated stand-alone, the PIM can be reprogrammed/debugged with program-

mers like the ICD 2 or REAL ICE in-circuit emulator via a modular RJ11 to ICSP™

(6-pin female header) adapter board. This adapter board can be ordered online from

www.microchipDIRECT.com, part number AC164110. This adapter board also comes

as part of the REAL ICE In-Circuit Emulator Performance Pak, microchipDIRECT part

number AC244002. When plugging the adapter board into the PIM, the silk screen

layer on both boards should face up. On the silk screens of each board, a small square

surrounds pin 1 (MCLR pin) on both the adapter board and PIM; these should line up.

2.4 MIGRATING TO THE PIC18F87J50 FAMILY

The PIC18F87J50 family of microcontrollers offers a number of enhancements and

new features compared to previous PIC18 devices. Most changes require no modifica-

tions to user firmware, however, this section highlights key items that deserve special

attention.

2.4.1 Special Function Register Addressing

The PIC18F87J50 family devices are very peripheral rich and consequently have more

Special Function Registers (SFRs) than will fit in the access portion of Bank 15. Some

of the new SFRs have been placed in the non-access portion of Bank 15 (addresses:

F40h to F5Fh inclusive). Some of the USB Control registers are located in the

non-access portion of Bank 15. See Section 5.3 “Data Memory Organization” in the

“PIC18F87J50 Family Data Sheet” (DS39775) for more details regarding these

changes.

In addition to the new Bank 15 SFRs, some of the new SFRs have been located in a

shadow space sharing the same addresses as other access bank SFRs. These

shadow space registers are only accessible when the WDTCON<ADSHR> bit has

been configured correctly.

When attempting to access the shadow space registers in either assembly or C18,

user firmware should be careful to keep track of, and manually control, the

WDTCON<ADSHR> bit.

When using Microchip’s C18 compiler, no source code changes will be needed to

address the non-access Bank 15 SFRs. The C18 compiler has awareness of these

new SFR locations and will automatically use the proper addressing modes to access

these registers.

The USB module on the PIC18F87J50 family of microcontrollers is compatible with

previous full-speed USB products, such as the PIC18F4550 family and PIC18F4450

family. The USB registers and bits within those registers retain the same names across

these families, so USB firmware can be ported between the devices with little or no

changes.

Important Notes and Migration Tips

2.4.2 Oscillator Configuration

The PIC18F87J50 family devices use the same 96 MHz PLL found in prior full-speed

USB microcontrollers, such as the PIC18F4550, but the implementation of the surround-

ing clock structure is slightly different. When migrating up to the PIC18F87J50 family of

devices, the most important change is the PLL does not automatically start when the

microcontroller is powered on, even if it is programmed to use one of the PLL-enabled

modes (e.g., HS+PLL). This allows the microcontroller to start up at less than the

maximum operating frequency. This can potentially be advantageous when running from

a decaying power source (such as a battery), where the applied voltage may not be

adequate for maximum frequency operation. For applications such as these, the

WDTCON<LVDSTAT> bit can be polled to determine if firmware can safely switch to

maximum frequency operation.

After the Power-up Timer expires and the microcontroller begins code execution, the

OSCTUNE<PLLEN> bit must be set by user firmware to activate the PLL (in

PLL-enabled modes). The PLL requires up to 2 ms to lock, during which time, the

microcontroller continues to execute code at the PLL-disabled frequency. User firm-

ware should not attempt to enable the USB module by setting the UCON<USBEN> bit

until after the PLL has locked (unless the PLL is not being used to derive the USB

module clock).

2.4.3 Input Buffer Selection

The PIC18F87J50 family of microcontrollers offers more flexibility compared to

previous PIC18 devices when selecting which I/O pins should use analog input buffers,

and which ones should use digital input buffers. Previous PIC18 microcontrollers used

the ADCON1 register to control this function, but the PIC18F87J50 family devices use

two new registers, ANCON0 and ANCON1, for this purpose. These new registers allow

the PIC18F87J50 family of microcontrollers to individually and independently select

which ANx pins should use digital or analog input buffers. See the Analog-to-Digital

converter chapter in the device data sheet for more details.

PIC18F87J50 FS USB Plug-In Module User’s Guide

NOTES:

PIC18F87J50 FS USB

PLUG-IN MODULE

USER’S GUIDE

Chapter 3. Hardware Configuration/Jumper Settings

3.1 HIGHLIGHTS

This chapter discusses:

• Hardware Features

•Crystal

• Linear Regulator/Power Management

•LEDs

• Push Buttons

•Jumpers

• Hardware Considerations for Compliance Testing

3.2 HARDWARE FEATURES

The PIC18F87J50 FS USB PIM has a number of hardware features intended to

make it useful as an initial development platform and demonstration board. Refer to

Appendix A. “PIC18F87J50 FS USB Plug-In Module Schematics” for schematics of

the PIM. The board offers the following hardware features:

1. 12 MHz miniature surface-mounted crystal.

2. 3.3V low IQ LDO linear regulator.

3. 2 bright red miniature LEDs (attached to I/O pins, RE0 and RE1).

4. MCLR push button for convenient device Reset.

5. General purpose push button (attached to I/O pin, RB4).

6. ICSP™ programming and debug 6-pin header.

7. USB mini-B connector.

8. Jumpers for added configurability (JP1, JP4, JP5).

9. Test points for convenient VDD, VDDCORE and GND measurements.

Figure 3-1 shows where these key components are located on the PIM with item

numbers corresponding to the above list.

PIC18F87J50 FS USB Plug-In Module User’s Guide

FIGURE 3-1: KEY COMPONENT LOCATIONS

3.3 CRYSTAL

In order to use the USB module on the PIC18F87J50 family of microcontrollers, the

module requires a fixed 48 MHz or 6 MHz clock for use in Full-Speed or Low-Speed

modes, respectively. These clock frequencies can be derived from the internal 96 MHz

PLL, and the microcontroller core need not run at the same frequency as the USB

module. In order to use the 96 MHz PLL, a clock source which is an integer multiple of

4 MHz is required. A 12 MHz crystal is included on the board for this purpose.

On the PIC18F87J50 microcontroller, the oscillator pins (RA6 and RA7) route directly

to the 12 MHz crystal. Unlike most other I/O pins, these do not route directly to the “ICE

Module” female headers. Two resistor pads can be used to connect RA6 and RA7 to

the female header pins, but by default, these are left unpopulated. This is done to

prevent “crystal contention” between the 12 MHz crystal on the PIM and the 10 MHz

crystal on the HPC Explorer board.

746

JP5

JP1

JP4

Hardware Configuration/Jumper Settings

3.4 LINEAR REGULATOR/POWER MANAGEMENT

The USB interface provides +5V (nominal) at up to 500 mA (only 100 mA can be

ensured) for use by USB peripheral devices. In order to take advantage of this bus

provided power, a 3.3V low drop out, low quiescent current linear regulator

(TC1108-3.3VDB) has been included on the PIM. This enables the PIM to be purely bus

powered, providing power to both the PIM and the HPC Explorer board if connected.

Alternatively, when used in conjunction with the HPC Explorer, the PIM may obtain

power from the HPC board. When a suitable power source is connected to power jack,

J1 on the HPC Explorer board, the board will natively produce a regulated 5V provided

by the on-board adjustable linear regulator. When a PIM requiring 3.3V (such as the

PIC18F87J50 FS USB PIM) is plugged in, resistor, R2, located on the PIM alters the

feedback circuit of the adjustable linear regulator and configures it to produce 3.3V.

Therefore, no soldering or other modification is required to either the HPC Explorer or

the PIC18F87J50 FS USB PIM when they are used together.

Jumper, JP4, on the PIM serves two main purposes. JP4 is located in series with the

+5V VBUS supply from the USB cable to the rest of the PIM board (see Figure A-1 for

exact electrical location). In this location, the jumper cap can be removed, and a digital

current meter can be inserted across the posts of the header. This can be quite useful

during development, as it offers a means of determining how much current the applica-

tion (both the PIM and the HPC Explorer board if connected) is actively consuming from

the USB port. This is especially important when developing bus powered USB

applications that are intended to be fully USB compliant.

All USB devices are supposed to implement a low-power USB Suspend mode. The

host PC may, at its own discretion, halt all USB traffic (including Start-of-Frame

packets) to your device for more than 3 ms. Upon detecting this condition, the USB

peripheral device should drop to a low-power suspend state, whereby it draws no more

than 500 μA (or in some cases, 2.5 mA; see the USB 2.0 specifications section 7.2.3)

from the +5V VBUS supply. Two USB interrupts, UIR<IDLEIF> and UIR<ACTVIF>, are

useful for detecting when the low-power suspend condition is supposed to begin and

when it ends. The TC1108-3.3VDB linear regulator was chosen for its low dropout, low

quiescent current consumption and good transient response capability.

PIC18F87J50 FS USB Plug-In Module User’s Guide

In addition to providing a convenient location for installing a digital current meter, JP4

also serves another purpose. In some cases, it may be undesirable to consume power

from the USB port, for example, when developing end applications that are always

self-powered or consume more than 300 mA (the maximum rating for the regulator). In

these cases, jumper cap, JP4, can be removed, and the PIM can obtain power from the

HPC Explorer board or directly from the test points.

Diode, D2, prevents the PIM from ever sourcing current onto the +5V VBUS pin of the

USB cable. The USB 2.0 specifications require that USB peripherals should never

source current onto the +5V VBUS line under any condition.

3.5 LEDs

Two high-efficiency, red LEDs have been included on the PIM. The LEDs are

connected to I/O pins, RE0 and RE1, and may be used for general purpose indication.

The LEDs are connected such that they turn on when the I/O pin controlling them is

driven high. Alternatively, if the I/O pin loading is undesirable (each LED consumes

approximately 1 mA when turned on), jumper cap covering, JP5, may be removed. This

will effectively disconnect both LEDs from their respective I/O pins.

3.6 PUSH BUTTONS

Two miniature push buttons are included on the PIM. Switch, S3 on the PIM, connects

to MCLR. It may be used to reset the microcontroller when the PIM is used either

stand-alone or while connected to the HPC Explorer board.

Pin, RB4 on the PIC18F87J50 microcontroller, is pulled up to VDD through a 15 kOhm

resistor (R26 on the PIM). If push button, S4 on the PIM, is pressed, it will pull RB4 low.

This push button may be used for any general purpose user interfacing purposes.

When the PIM is plugged into the HPC Explorer board, the RB0 push button on the

HPC Explorer will also work and can be used for additional general purpose user input.

3.7 JUMPERS

The PIM has three jumper headers on it to provide additional flexibility for

experimentation and development purposes.

JP1 – This is a three-pin header with the labels, ‘I’, ‘R’ and ‘U’. The ‘R’ is an abbreviation

referring to microcontroller pin, RB5. ‘I’ is an abbreviation referring to the “ICE” female

header pin for the RB5 signal. ‘U’ is an abbreviation for the USB VBUS line.

When the jumper is in the ‘R’ to ‘I’ position, the RB5 pin connects only to the ICE female

header pin, just like most of the other general purpose I/O pins. When the jumper is in

the ‘R’ to ‘U’ position, RB5 (which is 5.5V tolerant) can be used to sense when the USB

cable has been attached to the host, and when the host is actively providing power to

the +5V VBUS line. According to the USB 2.0 specifications, no device should ever pull

the D+ or D- lines high (such as with the D+ or D- pull-up resistor) until the host actively

powers the +5V VBUS line. This is intended to prevent self-powered peripherals from

ever sourcing even small amounts of power to the host when the host is not powered.

Small amounts of current could potentially prevent the host (and possibly other USB

peripherals connected to that host) from fully becoming depowered, which may cause

problems during power-up and initialization.

Hardware Configuration/Jumper Settings

Self-powered peripherals should periodically monitor the +5V VBUS line and detect

when it is driven high. Only when it is powered should user firmware enable the USB

module and turn on the D+ (for full speed) or D- (for low speed) pull-up resistor, signal-

ing device attach to the host. The recommended method of monitoring the +5V VBUS

line is to connect it to one of the microcontroller’s 5.5V tolerant I/O pins through a large

value resistor (such as 100 kOhms). The resistor serves to improve the ESD rugged-

ness of the circuit as well as to prevent microcontroller damage if user firmware should

ever unintentionally configure the I/O pin as an output.

Peripherals which are purely bus powered obtain all of their power directly from the +5V

VBUS line itself. For these types of devices, it is unnecessary to monitor when the VBUS

is powered, as the peripheral will not be able to source current on the D+, D- or VBUS

lines when the host is not powered.

JP4 – This jumper is located in series with the +5V VBUS power supply line from the

USB connector. When the jumper is removed, a current meter may be placed between

the header pins to measure the board current which is being drawn from the USB port.

Additionally, by removing the jumper cap altogether, JP4 provides a means of prevent-

ing the board from consuming USB power. See Section 3.4 “Linear Regulator/Power

Management” for more details.

JP5 – This jumper provides a means of removing the LED pin loading on the RE0 and

RE1 pins.

3.8 HARDWARE CONSIDERATIONS FOR COMPLIANCE TESTING

When developing USB applications that must pass the official USB compliance testing

process, it is recommended to select the USB cable and connector carefully. In order

to make a USB compliant application, the USB-IF requires that important USB building

blocks, such as cables and connectors, should also be individually compliant. For

example, if a standard USB B or mini-B connector is used on the application circuit

board, it should be capable of passing compliance tests specific for USB connectors.

USB building blocks which have officially gone through the compliance testing process

will have a Test ID (TID) number associated with them.

Microchip’s USB microcontrollers, such as the PIC18F87J50, have TID numbers

associated with them, and these numbers can be found at the USB design center:

http://www.microchip.com/usb (click on the “Full-Speed USB Solutions” link)

When developing products using standard USB cables and connectors, it is recom-

mended to know the TID number for those components prior to including them in the

design.

PIC18F87J50 FS USB Plug-In Module User’s Guide

NOTES:

PIC18F87J50 FS USB

PLUG-IN MODULE

USER’S GUIDE

Chapter 4. Demo Code/Reference Firmware

To assist in the development of USB applications, Microchip provides a number of

demonstration firmware projects (such as HID, CDC, etc.), and other support materials,

such as application notes. The USB demonstration projects use the same basic USB

framework, which is referred to as the “MCHPFSUSB Firmware”. Documentation for

this firmware can be found in the “MCHPFSUSB Firmware User’s Guide” (DS51679).

The firmware projects are contained in an executable setup file which can be found

either on the CD-ROM disc, which distributes with the PIM, or at the Microchip USB

design center:

http://www.microchip.com/usb

Once the MCHPFSUSB Firmware has been installed, the MPLAB® IDE project contain-

ing the source code and hex file for the HID class, mouse like demonstration firmware,

that comes preprogrammed on the PIC18F87J50, can be found in the following

directory:

C:\MCHPFSUSB\fw\HID\Mouse

By default, the MPLAB IDE projects are configured to work with the PICDEM™ FS USB

Demo Board, which uses the PIC18F4550 microcontroller. Refer to the MCHPFSUSB

Firmware release notes for details on how to switch the projects over for use with the

PIC18F87J50.

PIC18F87J50 FS USB Plug-In Module User’s Guide

NOTES:

PIC18F87J50 FS USB

PLUG-IN MODULE

USER’S GUIDE

Appendix A. PIC18F87J50 FS USB Plug-In Module Schematics

A.1 SCHEMATICS

The PIC18F87J50 FS USB Plug-In Module schematics are shown in Figure A-1 and

Figure A-2. By default, the PIM ships from the factory with the PIC18F87J50

pre-installed in location U1. The PIC18F87J50 is the superset part in the device family,

and is therefore, a good starting point for developing USB applications that will

eventually use one of the other devices in the device family.

However, the pads of U1 have been designed to accommodate any of the products in

the PIC18F87J50 family of microcontrollers, both the 80-pin TQFP and 64-pin TQFP.

For example, if the PIC18F87J50 is carefully desoldered using hot air, and the pads are

cleaned using solder wick, it is possible to install the 64-pin TQFP PIC18F65J50 in its

place. This is possible since the pin pitch is the same between the 64-pin and 80-pin

TQFP packages, and the functionality is the same for pins which share the same loca-

tions between the two packages. Effectively, the 80-pin TQFP pads of U1 overlap with

the standard 64-pin TQFP pads.

The board revision number can be found etched into the copper on the bottom side of

the PCB underneath the programming header. The board revision number is the last

number in the line and is located inside the rectangular box.

PIC18F87J50 FS USB Plug-In Module User’s Guide

FIGURE A-1: PIC18F87J50 FS USB PIM REV. 1 SCHEMATICS (SHEET 1 OF 2)

VBUS VBUS

1MF

.1 MF1MF2.2 MF

VDD Test Point

PIC18F87J50 FS USB Plug-In Module Schematics

FIGURE A-2: PIC18F87J50 FS USB PIM REV. 1 SCHEMATICS (SHEET 2 OF 2)

OSC1/CLKI/RA7

VDD

23 VUSB 70

VSS

16 RF4/D+ 11

VSS

13 RF7/SS

72 RD0/AD0

67 RD3/AD3

64 RD6/AD6/SCK2/SCL2

78 RE2/AD10

75 RE5/AD13

RG2/RX2/DT2

RH1/A17

RH4/AN12

RH7/AN15

RJ0/ALE

RJ3/WRH

RJ6/LB

MCLR

AVSS

VDD

AVDD

VDD

17 RF3/D-

RG1/TX2/CK2

RG4/CCP5

RG0/ECCP3

RG3/CCP4

RH3/A19

RH6/AN14

RH2/A18

RH5/AN13

RJ1/OE

VSS

RJ4/BA0

RJ7/UB

RJ5/CE

69 RD1/AD1

68 RD2/AD2

66 RD4/AD4/SDO2

65 RD5/AD5/SDA2

63 RD7/AD7/SS2

77 RE3/AD11

74 RE6/AD14

76 RE4/AD12

4RE0/AD8

3RE1/AD9

73 RE7/AD15

15 RF5/AN10/CVREF

14 RF6/AN11

RH0/A16

RJ2/WRL

18 RF2/AN7

OSC2/CLKO/RA6

VDDCORE/VCAP

46 RC5/SDO1

43 RC2/CCP1

52 RB6/KBI2PGC

55 RB3/INT3/CCP2

58 RB0/INT0

33 RA5/AN4

28 RA2/AN2/VREF-

37 RC6/TX1/CK1

36 RC0/T1OSO/T13CKI

38 RC7/RX1/DT1

35 RC1/T1OSI/CCP2

44 RC3/SCK1/SCL1

45 RC4/SDI1/SDA1

47 RB7/KBI3/PGD

57 RB1/INT1

56 RB2/INT2

54 RB4/KBI0/PMA1

53 RB5/KBI1/PMA0

VSS

27 RA3/AN3/VREF+

30 RA0/AN0

29 RA1/AN1

34 RA4/T0CKI

24 ENVREG

VSS

VDD

VSS

VDD

.1 MF

4.7 MF

18 pF

VDDCORE Test Point

VDDCORE

18 pF

12 MHz

PIC18F87J50

.1 MF

VUSB

VDD

VDDCORE/VCAP

AVDD

VUSB

AVDD

AVSS

VDD

VSS VSS

VDD

VUSB

PIC18F87J50 FS USB Plug-In Module User’s Guide

NOTES:

PIC18F87J50 FS USB

PLUG-IN MODULE

USER’S GUIDE

Index

Crystal...................................................................... 12

Customer Notification Service.................................... 4

Customer Support...................................................... 4

Demo Code/Reference Firmware ............................ 17

Documentation

Conventions........................................................ 2

Layout ................................................................. 1

Hardware

Features............................................................ 11

Hardware Considerations for

Compliance Testing.............................................. 15

HPC Explorer Board

Use with the PIM................................................. 7

Input Buffer Selection................................................. 9

Internet Address......................................................... 3

Jumpers ................................................................... 14

JP1.................................................................... 14

JP4.................................................................... 15

JP5.................................................................... 15

Kit Contents ............................................................... 5

CD-ROM ............................................................. 5

PIC18F87J50 FS USB Plug-In Module

Demo Board ......................................... 5

USB mini-B Cable............................................... 5

LEDs ........................................................................ 14

Linear Regulator....................................................... 13

Microchip Internet Web Site ....................................... 3

Migrating to the PIC18F87J50 Family........................ 8

Oscillator Configuration.............................................. 9

Overview of PIC18F87J50 USB Capabilities ............. 6

Power Management ................................................. 13

Programming the MCU .............................................. 8

Push Buttons............................................................ 14

Reading, Recommended ........................................... 3

Schematics............................................................... 19

Special Function Register Addressing ....................... 8

Using the Preprogrammed Firmware ......................... 6

WWW Address........................................................... 3

AMERICAS

Corporate Office

2355 West Chandler Blvd.

Chandler, AZ 85224-6199

Tel: 480-792-7200

Fax: 480-792-7277

Technical Support:

http://support.microchip.com

Web Address:

www.microchip.com

Atlanta

Duluth, GA

Tel: 678-957-9614

Fax: 678-957-1455

Boston

Westborough, MA

Tel: 774-760-0087

Fax: 774-760-0088

Chicago

Itasca, IL

Tel: 630-285-0071

Fax: 630-285-0075

Dallas

Addison, TX

Tel: 972-818-7423

Fax: 972-818-2924

Detroit

Farmington Hills, MI

Tel: 248-538-2250

Fax: 248-538-2260

Kokomo

Kokomo, IN

Tel: 765-864-8360

Fax: 765-864-8387

Los Angeles

Mission Viejo, CA

Tel: 949-462-9523

Fax: 949-462-9608

Santa Clara

Santa Clara, CA

Tel: 408-961-6444

Fax: 408-961-6445

Toronto

Mississauga, Ontario,

Canada

Tel: 905-673-0699

Fax: 905-673-6509

ASIA/PACIFIC

Asia Pacific Office

Suites 3707-14, 37th Floor

Tower 6, The Gateway

Harbour City, Kowloon

Hong Kong

Tel: 852-2401-1200

Fax: 852-2401-3431

Australia - Sydney

Tel: 61-2-9868-6733

Fax: 61-2-9868-6755

China - Beijing

Tel: 86-10-8528-2100

Fax: 86-10-8528-2104

China - Chengdu

Tel: 86-28-8665-5511

Fax: 86-28-8665-7889

China - Fuzhou

Tel: 86-591-8750-3506

Fax: 86-591-8750-3521

China - Hong Kong SAR

Tel: 852-2401-1200

Fax: 852-2401-3431

China - Qingdao

Tel: 86-532-8502-7355

Fax: 86-532-8502-7205

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

China - Shenzhen

Tel: 86-755-8203-2660

Fax: 86-755-8203-1760

China - Shunde

Tel: 86-757-2839-5507

Fax: 86-757-2839-5571

China - Wuhan

Tel: 86-27-5980-5300

Fax: 86-27-5980-5118

China - Xian

Tel: 86-29-8833-7252

Fax: 86-29-8833-7256

ASIA/PACIFIC

India - Bangalore

Tel: 91-80-4182-8400

Fax: 91-80-4182-8422

India - New Delhi

Tel: 91-11-4160-8631

Fax: 91-11-4160-8632

India - Pune

Tel: 91-20-2566-1512

Fax: 91-20-2566-1513

Japan - Yokohama

Tel: 81-45-471- 6166

Fax: 81-45-471-6122

Korea - Daegu

Tel: 82-53-744-4301

Fax: 82-53-744-4302

Korea - Seoul

Tel: 82-2-554-7200

Fax: 82-2-558-5932 or

82-2-558-5934

Malaysia - Penang

Tel: 60-4-646-8870

Fax: 60-4-646-5086

Philippines - Manila

Tel: 63-2-634-9065

Fax: 63-2-634-9069

Singapore

Tel: 65-6334-8870

Fax: 65-6334-8850

Taiwan - Hsin Chu

Tel: 886-3-572-9526

Fax: 886-3-572-6459

Taiwan - Kaohsiung

Tel: 886-7-536-4818

Fax: 886-7-536-4803

Taiwan - Taipei

Tel: 886-2-2500-6610

Fax: 886-2-2508-0102

Thailand - Bangkok

Tel: 66-2-694-1351

Fax: 66-2-694-1350

EUROPE

Austria - Wels

Tel: 43-7242-2244-39

Fax: 43-7242-2244-393

Denmark - Copenhagen

Tel: 45-4450-2828

Fax: 45-4485-2829

France - Paris

Tel: 33-1-69-53-63-20

Fax: 33-1-69-30-90-79

Germany - Munich

Tel: 49-89-627-144-0

Fax: 49-89-627-144-44

Italy - Milan

Tel: 39-0331-742611

Fax: 39-0331-466781

Netherlands - Drunen

Tel: 31-416-690399

Fax: 31-416-690340

Spain - Madrid

Tel: 34-91-708-08-90

Fax: 34-91-708-08-91

UK - Wokingham

Tel: 44-118-921-5869

Fax: 44-118-921-5820

WORLDWIDE SALES AND SERVICE

06/25/07

PIC18F87J50 FS USB Plug In Module User's Guide Users

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