Microchip Technology DM164120-1 User manual

©2005 Microchip Technology Inc. DS51556A
Low Pin Count Demo Board
User’s Guide

DS51556A-page ii ©2005 Microchip Technology Inc.
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LOW PIN COUNT DEMO BOARD
USER’S GUIDE
©2005 Microchip Technology Inc. DS51556A-page iii
Table of Contents
Preface ...........................................................................................................................1
Chapter 1. Low Pin Count (LPC) Demo Board Overview
1.1 Introduction .....................................................................................................7
1.2 Highlights ........................................................................................................ 7
1.3 Devices Supported by the LPC Demo Board ................................................. 7
1.4 LPC Demo Board Overview ........................................................................... 8
1.5 Running the PICkit™ 2 Flash Starter Kit Default Demonstration ...................8
Chapter 2. Mid-Range PICmicro®Architectural Overview
2.1 Introduction .....................................................................................................9
2.2 Memory Organization ...................................................................................10
2.3 Instruction formats ........................................................................................ 10
2.3.1 Assembler Basics ......................................................................................11
Chapter 3. LPC Demo Board Lessons
3.1 Introduction ...................................................................................................13
3.2 LPC Demo Board lessons ............................................................................ 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
DS51556A-page iv ©2005 Microchip Technology Inc.
NOTES:

LOW PIN COUNT DEMO
BOARD USER’S GUIDE
©2005 Microchip Technology Inc. DS51556A-page 1
Preface
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-Range PICmicro®Architectural Overview” – An overview of
the Mid-range PICmicro®Architecture.
•Chapter 3. “LPC Demo Board Lessons” – Contains a variety of lessons that
demonstrate how to utilize and experiment with the Low Pin Count Demo Board.
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.

Low Pin Count Demo Board User’s Guide
DS51556A-page 2 ©2005 Microchip Technology Inc.
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 isthe 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 font:
Plain Courier 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 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
©2005 Microchip Technology Inc. DS51556A-page 3
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 instructions on how to use the PICkit 2 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®IDE, Simulator, Editor User’s Guide (DS51025)
Consult this document for more information pertaining to the installation and features
of the MPLAB Integrated Development Environment (IDE) Software.

Low Pin Count Demo Board User’s Guide
DS51556A-page 4 ©2005 Microchip Technology Inc.
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
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.

Preface
©2005 Microchip Technology Inc. DS51556A-page 5
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 addition, there is a Development Systems Information Line which lists the latest ver-
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 International Locations
DOCUMENT REVISION HISTORY
Revision A (May 2005)
• Initial Release of this Document.

Low Pin Count Demo Board User’s Guide
DS51556A-page 6 ©2005 Microchip Technology Inc.
NOTES: