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Embedded Design with the PIC18F452, by John B. Peatman
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This book is developed around Microchip's latest family of parts, the PIC18FXXX family. It focuses on the PIC18F452, a new part brought to market in May 2002. It is intended that the reader will find a smooth path to the creative process of writing enhanced application code. This book attempts to organize and unify the development of these three capabilities: to understand and use components, to exploit powerful algorithmic processes, and to break down the complexity of an instrument or device so as to meet its specifications. The book is dedicated toward the development of creative design capability. Throughout this book, the approach taken is to introduce a template of assembly language code that encompasses a set of features of the PIC18F452 plus its interactions with some of the I/O devices resident on a small 4"x4" development board. For electrical engineers who work with the PIC18FXXX family.
- Sales Rank: #865608 in Books
- Published on: 2002-08-15
- Original language: English
- Number of items: 1
- Dimensions: 9.00" h x 1.00" w x 7.00" l, 1.85 pounds
- Binding: Paperback
- 420 pages
From the Back Cover
John Peatman's latest microcontroller work focuses on Microchip Technology's PIC18FXXX family, and its newest member, the PIC18F452. The enhanced instruction set and addressing modes simplify program code development, and the on-chip resources make this the most powerful PIC microcontroller ever.
Its flash program memory and built-in background debug mode provide internal programming/debugging support of program development. The presentation style throughout this book is to introduce the reader to simple programs that encompass features of the PIC18F452, plus interactions with I/0 devices, providing the reader with a smooth and quick learning process for creatively writing enhanced application code. Hundreds of figures give visual support to the text. Examples, end-of-chapter problems, suggested lab projects, complete designs, plus a QwikFlash development board support a "learning by doing" environment.
About the Author
John B. Peatman is a Professor of Electrical and Computer Engineering at the Georgia Institute of Technology. He is the author of five earlier digital design, microprocessor, and microcontroller textbooks. He is also a director with the Intelligent Systems Corporation. His current research interests include the design of low-cost development tools for microcontrollers. Professor Peatman is a Fellow of the IEEE.
Excerpt. � Reprinted by permission. All rights reserved.
The evolution of microcontrollers (i.e., single-chip microcomputers) has been driven by two strong trends. One trend is the demand for a low-cost means of putting intelligence into a product. When a product is produced in quantities of millions, a small savings in component cost will drive component selection decisions. Another trend is the demand for a programmable solution when an application has severe timing constraints, such as those in automobile engine control. This demand has led to ever faster, more sophisticated microcontroller architectures. Microchip Technology has evolved its product line of PIC microcontrollers from simple, low-cost devices. Subsequent generations of PIC microcontrollers have included enhancements to meet the needs of an increasing circle of applications. At the same time, Microchip has never lost sight of the value of introducing new technology at the lowest possible cost and thereby "buying" market share. As pointed out in Chapter 1 of this text, Microchip has followed this strategy to the point where it is now the number two producer of eight-bit microcontrollers in the world, with a market share that continues to rise each year. Because eight-bit microcontrollers span the needs of most applications, "eight-bitters" dominate the world of microcontrollers.
This book is developed around Microchip's latest family of parts, the PIC I8FXXX family. It focuses on the PIC 18F452, a new part brought to market in May 2002. It is a 40-pin microcontroller upgrade of their earlier PIC 16C74 and PIC 16F877 microcontrollers. This upgrade will be familiar to users of those parts, but with myriad enhancements. Virtually all of the quirks that characterized earlier PIC microcontroller parts have been eliminated. The flash program memory of the PIC 1817452 microcontroller makes low-cost development possible. Not only is the part inexpensive (less than $10 in single quantities), but it is supported by Microchip's free assembler and by a free Qwikl3ug monitor program. QwikBug, once programmed into the chip, supports the downloading of successive iterations of a user program and supports the ability to debug the user program with the help of running to a breakpoint, monitoring/changing watch variables, and single-stepping.
To provide a "learning by doing" environment, a QwikFlash development board is included inside the back cover of this first printing of the book. A photograph of the populated board is shown in Figure 4-1. Readers not interested in using this board may wish to know that the board is included, gratis, courtesy of a friend of the author. Parts for populating the board can be purchased under a special arrangement with the DigiKey Corporation. Appendix Al includes the Digi-Key parts list as well as construction hints, intended both for the novice who has never soldered before and for the experienced student, professional, and hobbyist. Alternatively, a populated board can be purchased from MICRODESIGNS, Inc. via their Web site, www.microdesignsinc.com .
Throughout this book, the approach taken is to introduce a template of assembly language code that encompasses a set of features of the PIC18F452 plus its interactions with some of the I/O devices resident on the QwikFlash board. In this way, it is intended that the reader will find a smooth path to the creative process of writing enhanced application code. There is no end to the variety of such enhancements, many of which are suggested in the end-of-chapter problems. Others are listed in Appendix A10 as a set of suggested lab projects that might accompany the first offering of a college or university course organized around this book. Still other project enhancements are suggested by the presence of the many features of the microcontroller and by the versatility of the QwikFlash board's I/O devices themselves.
Many years ago, Skip Addison impressed me with the clarity that his structured assembler could bring to the writing of code. Its implementation of nested IF . . . ELSE... ENDIF, WHILE . . . ENDWHILE, and REPEAT . . . UNTIL constructs gave assembly language the clean control flow normally associated with a compiled language such as C. At this time, Jessica Meremonte has prepared a free structured assembly preprocessor that, together with Microchip's free (and excellent) assembler, does this same thing for code writing with the PIC18F452 microcontroller. Introduced in Chapter 6, the use of Jessica's sasm utility acts like a one-step assembler. It enhances the code writing process, and code understandability, for the remaining 14 chapters of the book.
To utilize a microcontroller effectively, a designer should develop at least three capabilities, each of which is addressed in this book. First, he or she must understand available components. This begins with the microcontroller itself, with its CPU register structure, its instruction set, its addressing modes, and its on-chip resources. It extends to user I/O devices such as keypads and displays and sensing/ control devices such as temperature transducers and stepper motor actuators. Using interrupt control, a microcontroller can juggle many real-time activities simultaneously. To achieve this without error, the designer must understand how the microcontroller handles interrupts and the timing issues related to them.
Second, the designer must thoroughly understand the algorithmic processes required by each aspect of the design and be able to translate them into the language of the microcontroller. For example, the design of an antilock brake system for an automobile involves an understanding of both the brake system dynamics and the implementation of a suitable control algorithm.
Third, the designer must understand how the extensive requirements of an instrument or device can be broken down into manageable parts. Almost any project can be likened to the process of jumping from boulder to boulder to cross a stream. Each boulder may represent the design ideas needed to understand and use a device such as a liquid crystal display. But in addition to studying boulders, the designer must pay attention to how streams are crossed. Through examples, both with the template programs and with complete designs available on the author's web site (e.g., the source code for the QwikFlash instrument described in Section 4.3), the reader can view the structure of several projects.
This book attempts to organize and unify the development of these three capabilities: to understand and use components, to exploit powerful algorithmic processes, and to break down the complexity of an instrument or device so as to meet its specifications.
ABOUT THE BOOK
This book will typically be used in a one-semester course at the senior level. Alternatively, it might be used at the junior level if it is deemed worthwhile to trade the increased engineering experience of seniors for the opportunity to follow this course with other design-oriented courses and individual project activities. Although the context of the book is electrical, each component is sufficiently explained to permit the book to be used in a variety of curricula as an introduction to design using a microcontroller. The incentive to so use the book lies in the diverse applications made possible by the availability of a "controller on a chip."
There has been an attempt to make many parts of the book self-contained. A reader might scan Chapter 1 to gain the perspective of Steve Sanghi, CEO and President of Microchip Technology. Chapters 2 and 3 describe the PIC18F452's CPU structure, instructions, and addressing modes. The brief Chapter 4 describes the features of the QwikFlash board (i.e., the built-up version of the bare board located on the inside back cover of the book). This description includes one application of the board as a QwikFlash instrument to measure frequencies and time intervals with uncanny accuracy, using a free program available from the author's web site.
Chapters 5 and 6 present the first template of code and a discussion of development alternatives. This latter discussion is augmented in the appendices. Appendix sections A1.2 and A4.3 describe Microchip's ICD2 in in-circuit debugger. Appendix A4 describes the free QwikBug on-chip monitor program and what it takes to program it into a chip. Appendix A3 describes how the free sasm structured assembler utility can be used with or without the support of Microchip's MPLAB facility. Appendix section A5.2 describes the free QwikAddress utility and the help it provides in conjunction with the sasm utility.
Chapter 7 develops the use of the liquid-crystal display built into the QwikFlash board. A second template of code is presented, serving as a stepping stone for subsequent project work. Chapters 8 and 12 augment the discussion of user I/O available on the board. Chapter 8 discusses a widely used input device, the rotary pulse generator (RPG). Chapter 12 develops what amounts to an allocation scheme play and the RPG, for user input.
Chapter 9 discusses the timing and the critical region issues associated with interrupts. It describes the high- and low-priority mechanisms built into the chip to field interrupts and explains how to allocate interrupt sources between the two so as to be most effective in meeting the timing requirements of and application.
The remaining chapters of the book can be "mixed and matched" to meet the needs of a course and its sequencing of lab projects. Chapters 13 and 16 explain in detail how to use the PIC 18F452's superb timers for capturing the timing of input events and for controlling the timing for output events. Chapters l describe the nuances of using the chip's analog and digital input pins. Chapter 14 explains how to use any of Microchip's library of 36 integer subroutines for dealing with the multiplication and division of multiple-byte unsigned and signed numbers. It also explains how to use their eight floating-point subroutines and the role of these subroutines in retaining the precision of a computation. Chapters 15 and 17 delve into two approaches for expanding the number of I/O pins available as well as two convenient means for enhancing the peripheral capabilities of the chip beyond those peripherals already built chip. Chapter 18 discusses the use of the UART built into the chip while Chapter 19 looks at how a low-end PIC microcontroller can be used as a smart peripheral, connecting to the PIC 1817452 through one of its UART pins. Chapter 20 discusses a variety of disparate but significant features of the chip, including the use of its non-volatile data EEPROM, its watchdog timer and brownout reset circuits, and how it can be operated to achieve an exceedingly low battery supply current.
The last two template programs, P3 and P4, are recast as C programs written by Mike Chow and included in Appendix A7. Each one is written for both Microchip Technology's C compiler and Hi-Tech Software's C compiler, two high-quality C compilers. A class that makes the switch from assembly coding can benefit from the use of the P3 template, cast in C. As a template for subsequent work, it encompasses many issues that will arise as further code is written. The P4 template illustrates how to handle interrupts.
This book is directed toward a specific goal of engineering studies—the development of creative capability. Given a powerful, low-cost microcontroller chip, a low-cost development board, and the development tools needed to develop and debug program code, we are able to focus the design process on the microcontroller chip itself and a variety of I/O devices, thereby giving zest to the process of learning. While some of these I/O devices are available on the QwikFlash board itself, the laboratory for a college or university course can make use of a second QwikProto board to expand the variety of 1/O resources easily, as described in Appendix A2 and illustrated, by example, in the photograph of Figure A2-5. Other I/O possibilities are described there and in Appendix section A 10.2. Also refer to the author's web site, www.picbook.com , for URLs pointing to I/O device information and project ideas being employed at other universities. To help readers take advantage of the opportunities for developing microcontroller design capability, most chapters close with an assortment of problems, many having a design flavor. A suggested course calendar is included at the beginning of Appendix A10 along with 10 "starter" lab projects.
Most helpful customer reviews
3 of 11 people found the following review helpful.
Useful information, poor layout.
By Colin D. Barnard
If having technical diagrams over the page to the corresponding text annoys you, then be prepared to be annoyed! The book doesn't get going really until chapter 3, however I found that having the technical figures (in most cases) not on the page or adjoining page, but having to flick back and forth a distraction to my concentration. The diagrams while helpful are a little confusing with the way in which they are layed out.
In some places after describing a method in addressing registers, the example uses an alternative - fine, if in the context of, there is more than one way to achieve this, but this is patently not the context here.
The book seems to be really designed to be part of a classroom tutorial and discussion.
Be ready to put in some extra concentration if your buying this book without resource to other literature.
On the whole the book is technically useful, the hardcover pleasant, but the placing of the diagrams really let the book down.
10 of 11 people found the following review helpful.
Excellent Book - Great follow-on first book
By Dave
John's book is a great follow on to his original book, "Design with PIC Microcontrollers. The book is not a cut and paste solution (As are two other good books "Easy PIC'n" and "PIC'n Up The Pace") and is intended to teach the student how to best use the architecture. The intent of the book is to give the student enough theory to use the PIC18F452 and understand the design philosophy of the architecture. The book is a great compliment to the Microchip datasheet service as a "user's guide". Great examples of how the 18F452 architecture can be best utilized, well organized diagrams (Which, by the way do not require "flicking back and forth" any more that a typical technical book I've read ). The subject material covers all of the highlights of the PIC18F452, giving examples for typical usages of LCD displays, A/D, Interrupts, I/O pin considerations, timers, math subroutines, I2C/SMBus usage, UART, etc. There are supporting code template designed to suggest possible code organization. The book develops a very useful utility (SASM) to preprocess PIC assembly in an attempt to make assembly language more structured. The utility IS NOT required and the rest of the book may be read without using the utility. I had no problem obtaining the components for the included circuit board (All required parts can be purchased as a kit from Digi-Key at a discount) and found it very comparable to Microchip's own demo boards.
11 of 11 people found the following review helpful.
Many illustrations to help you visualize
By Robert Shultz
Although some material in the book can be read from spec sheets found on the net, the book really helps to sort through a lot of the clutter in spec sheets. A major benefit of this book is that it provides plenty of detailed illustrations to help you understand the facilities of the PIC instead of simply giving you page after page of techical specs. It also provides plenty of "template" code to help you get up and running if you're kind of new to microcontroller assembly.
If you do the sample projects throughout the book, they really help you better understand most of the facilities of the PIC.
One thing to note is that the book is written for a semester long college course though I think it's doable for self-study if you have at least some background with PICs. It even provides a PCB on the back cover whereby you can build your own board (I think you can order a package from digikey that has all the parts you need to build one) to run your code on.
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