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Editorial Reviews
Card catalog description
"Describes, in detail, the Motorola 68HC12 microcontroller, how to program it, and how to design embedded systems using the 68HC12. It shows how WHYP (a version of Forth written specifically for this book) can be used to program the new 68HC12 microcontroller in an efficient and interactive way."--BOOK JACKET.
From the Inside Flap
Preface
"Describes, in detail, the Motorola 68HC12 microcontroller, how to program it, and how to design embedded systems using the 68HC12. It shows how WHYP (a version of Forth written specifically for this book) can be used to program the new 68HC12 microcontroller in an efficient and interactive way."--BOOK JACKET.
From the Inside Flap
Preface
Many people think of a computer as a PC on a desk with a keyboard and video monitor. However, most of the computers in the world have neither a keyboard nor a video monitor. Rather they are small microcontrollers—a microprocessor, memory, and 1/0 all on a single chip—that are embedded in a myriad of other products such as automobiles, televisions, VCRs, cameras, copy machines, cellular telephones, vending machines, microwave ovens, medical instruments, and hundreds of additional products of all kinds. This book is about how to program microcontrollers and use them in the design of embedded systems.
A popular microcontroller that has been used in a wide variety of different products is the Motorola 68HC11. Motorola has recently introduced an upgrade of this microcontroller, the 68HC12, that has new, more powerful instructions and addressing modes. This book emphasizes the use of the 68HC12 while at the same time providing information about the 68HC11. It can therefore be used in courses that use both 68HC12 and 68HCll microcontrollers.
This book is the result of teaching various microcomputer interfacing courses over the past 20 years. While the technology may change, the basic principles of microcomputer interfacing remain largely the same and these basic principles are stressed throughout this book. However, microcomputer interfacing is a subject that is learned only by doing. The courses that I have taught using this material have all been project-oriented courses in which the students design and build real microcomputer interfacing projects.
A definite trend in microcomputer interfacing and in digital design in general is a shift from hardware design to software design. Microcomputer interfacing has always involved both hardware and software considerations. However, the increasingly large-scale integration of the hardware together with sophisticated software tools for designing hardware means that even traditional hardware design is becoming more and more a software activity.
In the past most software for microcomputer interfacing has been written in assembly language. This means that each time a new and better microprocessor comes out the designer must first learn the new assembly language. The advantage of assembly language is that it is "closest to the hardware" and will allow the user to do exactly what he or she wants in the most efficient manner. While some feel that assembly language programs are more difficult to write and maintain than programs written in a high-level language, the major disadvantage of assembly language programs is related to the obsolescence of the microp