Microchip Technology Low Pin Count Demo Board User’s Guide

Low Pin Count Demo Board

User’s Guide

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digit al Millennium Copyright Act. If suc h a c t s allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of M icrochip’s prod ucts as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.

Trademarks

The Microchip name and logo, the Microchip logo, Accuron, dsPIC, K

EELOQ, microID, MPLAB, PIC, PICmicro, PICSTART,

PRO MATE, PowerSmart, rfPIC, and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB, PICMASTER, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active Thermistor, MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, rfLAB, rfPICD EM, Select Mode, Smart Serial, SmartTel, Total Endurance and WiperLock are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their respective companies.

Printed on recycled paper.

Microchip received ISO/TS-16949:2002 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona and Mountain View, California in October 2003. The Company’s quality system processes and procedures are for its PICmicro devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified.

8-bit MCUs, KEELOQ

code hopping

LOW PIN COUNT DEMO BOARD

USER’S GUIDE

Tabl e of Conten ts

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

Chapter 1. Low Pin Count (LPC) Demo Board Overview

1.1 Introduction ..................................................................................................... 7

1.2 Highlight s .................... .. ............. .. .............. .. .. ............. ... ............. .. .. ............. ... 7

1.3 Devices S u pp o rted by the LPC D e mo Board .................... ............. .. .............. 7

1.4 LPC Demo B o a rd O verview ...................... .. ............. .. .............. .. ............. .. ..... 8

1.5 Running the PICkit™ 2 Flash Starter Kit Default Demonstration ................... 8

Chapter 2. Mid-Range PICmicro® Architectural Overvie w

2.1 Introduction ..................................................................................................... 9

2.2 Memory Organization ...................................................................................10

2.3 Instruct io n fo rma ts ...... .. ............. .. .............. .. .. ............. ... ............. .. .. ............. . 10

2.3.1 Assembler Basics ......................................................................................11

Chapter 3. LPC Demo Board Lessons

3.1 Introduction ................................................................................................... 13

3.2 LPC Demo B o a rd le ss o n s ................ ............. .. .............. .. ............. .. ............. . 13

3.2.1 Lesson 1: Hello World (Light a LED) .......................................................................14

3.2.2 Lesson 2: Delay Loop (Blink a LED) ....................................................................... 15

3.2.3 Lesson 3: Rotate (Move the LED) ...........................................................................17

3.2.4 Lesson 4: Analog-to-Digital .....................................................................................19

3.2.5 Lesson 5: Variable Speed Rotate ...........................................................................22

3.2.6 Lesson 6: Switch Debouncing ................................................................................23

3.2.7 Lesson 7: Reversible Variable Speed Rotate ......................................................... 25

3.2.8 Lesson 8: Function Calls ........................................................................................26

3.2.9 Lesson 9: Timer0 ....................................................................................................27

3.2.10 Lesson 10: Interrupts ............................................................................................29

3.2.11 Lesson 11: Indirect Data Addressing ....................................................................31

3.2.12 Lesson 12: Look-up Table (ROM Array) ...............................................................33

Appendix A. Hardware Schematics

A.1 Introduction .................................................................................................. 37

Worldwide Sales and Service ....................................................................................38

Low Pin Count Demo Board User’s Guide

NOTES:

LOW PIN COUNT DEMO

BOARD USER’S GUIDE

Preface

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

IDE on-line help.

INTRODUCTION

This chapter contains general information that will be useful to know before using the Low Pin Count (LPC) Demo Board. Items discussed in this chapter include:

• About this Guide

• Warranty Registration

• Recommended Reading

• Troubleshooting

• The Microchip Web Site

• Development Systems Customer Notification Service

• Customer Support

DOCUMENT LAYOUT

This document describes how to use the Low Pin Count Demo Board User’s Guide as a development tool to emulate and debug firmware on a target board. The manual layout is as follows:

• Chapter 1. “Low Pin Count (LPC) Demo Board Overview” – An overview of Microchip’s Low Pin Count Demo Board.

• Chapter 2. “Mid-Ra nge PICm icro the Mid-range PICmicro

• Chapter 3. “ LPC Demo Boa rd Lesso ns” – Contains a variety of lessons that demonstrate how to utilize and experiment with the Low Pin Count Demo Board.

Architecture.

Architectural Overview” – An overview of

Low Pin Count Demo Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following docum entat io n conven tion s:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB

Emphasized text ...is the only comp ile r...

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

Underlined, italic text with right angle bracket

Bold characters A dialog button Click OK

N‘Rnnnn A number in verilog format,

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

Courier font:

Plain Courier Sample source code #define START

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

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe character: { | }

Ellipses... Replaces r epeated text var_name [,

A menu path File>Save

A tab Click the Power tab

where N is the tota l number of digits, R is th e radi x and n is a digit.

Filenames autoexec.bat File paths c:\mcc18\h Keywords _asm, _endasm, static Command-line options -Opa+, -Opa- Bit values 0, 1 Constants 0xFF, ‘A’

Choice of mutually exclusive arguments; an OR selection

Represents code supplied by user

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options] errorlevel {0|1}

var_name...] void main (void)

{ ... }

IDE User’s Guide

WARRANTY REGISTRATION

Please complete the enclosed Warranty Registration Card and mail it promptly. Sending in the Warranty Registration Card entitles users to receive new product updates. Interim software releases are available at the Microchip web site.

RECOMMENDED READING

This user’s guide describes how to use the Low Pin Count (LPC) Demo Board. Other useful documents are listed below. The following Microchip documents are available and recommended as supplemental reference resources.

Readme for Low Pin Count (LPC) Demo Board

For the latest information on using the Low Pin Count (LPC) Demo Board, read the “Readme for Low Pin Count Demo Board.txt” file (an ASCII text file) in the PICkit 2 installation directory. The Readme file contains update information and known issues that may not be included in this user’s guide.

Readme Files

For the latest information on using other tools, read the tool-specific Readme files in the Readmes subdirectory of the MPLAB IDE installation directory. The Readme files contain update information and known issues that may not be included in this user’s guide.

PICkit™ 2 Microcontroller Programmer User’s Guide (DS51553)

Consult this document for instr ucti ons on how to use the PICkit2 Microcontroller Programmer hardware and software.

PIC16F685/687/689/690 Data Sheet (DS41262)

Consult this document for information regarding the PIC16F685/687/689/690 20-pin Flash based, 8-bit CMOS Microcontroller device specifications.

MPLAB

Consult this document for more information pertaining to the installation and features of the MPLAB Integrated Development Environment (IDE) Software.

IDE, Simulator, Editor User’s Guide (DS51025)

Preface

Low Pin Count Demo Board User’s Guide

THE MICROCH IP 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 listin g

• 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

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 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 Plus and PICkit

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

1 development programmers.

II device programmers and the PICSTART®

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

• Development Systems Information Line 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 In additi on, t her e is a De velo pment Sys tem s In form at ion Li ne w hic h lis t s th e la tes t ve r-

sions of Microchip’s development systems software products. This line also provides information on how customers can receive currently available upgrade kits.

The Development Systems Information Line numbers are: 1-800-755-2345 – United States and most of Canada 1-480-792-7302 – Other Interna tio nal Loca tio ns

Preface

DOCUMENT REVISION HISTORY

Revision A (May 2005)

• Initial Release of this Document.

Low Pin Count Demo Board User’s Guide

NOTES:

LOW PIN COUNT DEMO BOARD

USER’S GUIDE

Chapter 1. Low Pin Count (LPC) Demo Board Overview

1.1 INTRODUCTION

This chapter introduces the Low Pin Count (LPC) Demo Board and describes the LPC Demo Board features.

1.2 HIGHLIGHTS

This chapter discusses:

• Devices supported by the LPC Demo Board

• The LPC Demo Board Overview

• Running the PICkit™ 2 Starter Kit Default Demonstration

1.3 DEVICES SUPPORTED BY THE LPC DEMO BOARD

For a list of supported devices, see the LPC Demo Board README file on the PICkit™ 2 Starter Kit CD-ROM.

8-pin DIP Flash Devices:

PIC12F508 PIC12F629 PIC12F635 PIC12F509 PIC12F675 PIC12F683 PIC12F510

14-pin DIP Flash Devices:

PIC16F505 PIC16F630 PIC16F684 PIC16F506 PIC16F676 PIC16F688

20-pin DIP Flash Devices:

PIC16F685 PIC16F689 PIC16F785 PIC16F687 PIC16F690

Low Pin Count Demo Board User’s Guide

1.4 LPC DEMO BOARD OVERVIEW

The Low Pin Count Demo Board Works with the PICkit™ 2 Microcontroller Programmer to help the user get up to speed quickly using PICmicro This user’s guide is written in the form of Lessons intended for a person with some exposure to assembly language but has never used a PICmicro

The LPC Demo Board overview is shown in Figure 1-1.

FIGURE 1-1: LPC DEMO BOARD

microcontr ollers.

microcontroller.

PICkit™ 2 Programming Header

14-pin Expansion

Header

20-pin

DIP Socket

Generous

Prototyping

Area

Potentiomete

Push Button

LEDs

1.5 RUNNING THE PICkit™ 2 STARTER KIT DEFAULT DEMONSTRATION

The Low Pin Count Demo Board comes preprogrammed with a demonstration program. To use this program, connect the PICkit™ 2 Starter Kit to the PC’s USB port using the USB cable. Start the PICkit™ 2 Microcontroller Programmer application and check the target power box. The demo program will blink the four red lights in succession. Press the Push Button Switch, labeled SW1, and the sequence of the lights will reverse. Rotate the potentiometer , labeled RP1, and th e light sequence will blink at a different rate. This demo program is developed through the first 7 lessons in this guide.

LOW PIN COUNT DEMO BOARD

USER’S GUIDE

Chapter 2. Mid-Range PICmicro® Architectural Overview

2.1 INTRODUCTION

This chapt er describes the Mid-range PICmicro® Architectural Overview for the LPC Demo Board.

FIGURE 2-1: SIMPLIFIED MID-RANGE PICmicro

INT

Program Counter

8-Level Stack (13-bit)

Direct Addr

Program

Bus

OSC1/CLKI

OSC2/CLKO

Flash

4k x 14

Program

Memory

Instruction Reg

Instruction

Decode and

Control

Timing

Generation

BLOCK DIAGRAM

Data Bus

RAM

256 bytes

File

Registers

RAM Addr

Addr MUX

FSR Reg

Status Reg

MUX

ALU

W Reg

Indirect

Addr

Internal

Oscillator

Block

+ 29 hidden pages

Microchip Technology Low Pin Count Demo Board User’s Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

Chapter 1. Low Pin Count (LPC) Demo Board Overview

1.1 INTRODUCTION

1.2 HIGHLIGHTS

1.3 DEVICES SUPPORTED BY THE LPC DEMO BOARD

1.4 LPC DEMO BOARD OVERVIEW

FIGURE 1-1: LPC DEMO BOARD

1.5 RUNNING THE PICkit™ 2 STARTER KIT DEFAULT DEMONSTRATION

Chapter 2. Mid-Range PICmicro® Architectural Overview

2.1 INTRODUCTION