Embedded Systems Design using the TI MSP430 Series

291 Pages·2003·8.636 MB·English

by  Nagy Chris

Embedded Systems Design
using the TI MSP430 Series
by Chris Nagy
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Library of Congress Cataloging-in-Publication Data
Nagy, Chris.
Embedded system design using the TI MSP430 series / Chris Nagy.
p. cm.
Includes index.
ISBN: 0-7506-7623-X
1. Embedded computer systems—Design and construction—Data processing.
2. Texas Instruments MSP430 series microprocessors. I. Title.
TK7895.E42N34 2003
004.2’56—dc21
2003054143
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Contents
About the Author..................................................................................ix
What’s on the CD-ROM........................................................................xi
Chapter 1: Introduction.........................................................................1
About this book................................................................................ 2
The MSP430 Family ..........................................................................3
Part Numbering Convention.............................................................. 4
Writing Code....................................................................................5
Chapter 2: Architecture: CPU and Memory..........................................11
CPU Features.................................................................................. 12
Memory Structure........................................................................... 19
Chapter 3: Reset and Interrupts ..........................................................25
Reset Sources ................................................................................. 25
Reset Condition.............................................................................. 26
Interrupts....................................................................................... 27
Use of Interrupts............................................................................. 30
Guidelines for Interrupt Service Routines.......................................... 35
Common Sources of Error............................................................... 36
Interrupts vs. Polling ....................................................................... 37
v
Embedded Systems Design using the TI MSP430 Series
Chapter 4: Clocks and Timers..............................................................39
Clock Sources................................................................................. 39
Clock Controls................................................................................ 46
Clock Uses...................................................................................... 54
Debugging Clock Difficulties ........................................................... 63
Chapter 5: Input and Output...............................................................69
Chapter 6: On-Chip Peripherals...........................................................75
Hardware Multiplier........................................................................ 75
Analog-to-Digital Converters........................................................... 82
An ADC Example ............................................................................ 89
LCD Driver ..................................................................................... 91
Chapter 7: Hardware Considerations...................................................95
The Datasheet ................................................................................ 96
Configuration................................................................................. 97
Performance Issues ......................................................................... 99
Debugging Tools........................................................................... 100
Chapter 8: Addressing Modes............................................................103
Register Mode .............................................................................. 104
Immediate Mode .......................................................................... 106
Symbolic Mode/Absolute Mode .................................................... 109
Indirect Mode/Indirect Autoincrement Mode................................. 111
Chapter 9: Instruction Set .................................................................115
Core Instructions.......................................................................... 120
Emulated Instructions................................................................... 147
Chapter 10: Flash Memory ................................................................157
Flash Memory Structure ................................................................ 157
Flash Memory Control Registers .................................................... 158
Using Flash Memory...................................................................... 162
vi
Contents
Security Fuse................................................................................. 164
Information Memory .................................................................... 165
Flash Memory Code Examples ....................................................... 166
Bootstrap Loader.......................................................................... 169
Chapter 11: Developer’s Toolbox ......................................................173
Real-Time Clocks .......................................................................... 173
D/A Conversion: Pulse Width Modulation ..................................... 184
Sliding Correlators........................................................................ 186
Chapter 12: Low-power Design .........................................................189
MSP430 Power Consumption Characteristics................................. 189
MSP430 Low-power Modes........................................................... 190
Periodic Interrupts and Low-Power Design..................................... 192
Low-power Design ........................................................................ 194
Chapter 13: A Sample Application.....................................................197
Main Loop ................................................................................... 202
Interrupt Service Routines ............................................................. 203
Putting It All Together................................................................... 208
Appendix A: Other Sources ...............................................................221
Texas Instruments ......................................................................... 221
Other Embedded Resources .......................................................... 222
Appendix B: TI FET Tool ...................................................................223
Kit Contents................................................................................. 223
Setting Up .................................................................................... 224
Using Kickstart and the FET .......................................................... 224
Appendix C: Useful Acronyms............................................................227
Appendix D: A Sample Datasheet......................................................229
Index.................................................................................................277
vii
[This is a blank page.]
About the Author
Chris Nagy is a senior firmware engineer currently working in the field of
utility telemetry systems. He has spent the past several years designing with
TI’s family of microcontroller products.
ix
[This is a blank page.]
What’s on the CD-ROM?
Included on the accompanying CD-ROM:
■ A fully searchable eBook version of the text in Adobe pdf format
■ The code from the design examples in this book
■ Various useful documents related to the TI MSP430 family
xi
1
CHAPTER
Introduction
As a developer, I grew up on the PIC. Very seldom will you find an embedded
developer who has not used this workhorse at one point in their career. Like
others, I knew the parts, the tools, and the company. My university used the
8051 in the class on microcontrollers, but when I got out, I learned the PIC
from another developer who had been using it for years. When a new project
cropped up, I would dig out the same development tools and methods that I
had always relied on.
A few years back, I was forced out of my rut. The new project that I
was on had much tighter requirements than I had previously experienced.
Downloadable firmware, insanely low current budgets and the omnipresent
“Don’t spend too much” requirements added up to one inescapable fact: my
old standby wasn’t going to cut it this time. I needed a better
microcontroller.
One of my fellow developers introduced me to the Texas Instruments
MSP430. If the marketing literature and datasheet were correct, it would
do everything I needed. However, as this book discusses later, I seldom trust
datasheets, let alone those brightly colored marketing brochures that I seem
to receive from every semiconductor manufacturer under the sun. So, I
ordered a development kit and played with it. It proved (and has continued
to prove) to be a very powerful and useful device.
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