By G. Jack Lipovski

Advent to Microcontrollers is a finished introductory text/reference for electric and computing device engineers, scholars, or even hobbyists who've little event in a high-level programming language. The publication is helping them know the way a standard microcontroller executes meeting language directions and addressing modes on microprocessors. The booklet exhibits how you can software with C++ and collect meeting language statements. The booklet makes use of the hot 16-bit microcontroller, the Motorola 68Hc12, because the fundamental instance. This "chip" replaces the extremely popular 8-bit microcontroller, the 68Hc11, because the prime microprocessor for a wide selection of functions and as a middle software for educating engineering scholars. This new microcontroller is anticipated to be renowned in as a result of its cost-effective in line with unit, low strength intake, and excessive processing velocity. * First introductory point publication at the Motorola 68HC12* Teaches engineers how a working laptop or computer executes directions* indicates how a high-level programming language converts to meeting language* Teaches the reader how a microcontroller is interfaced to the skin international* makes use of thousands of examples through the textual content* Over two hundred homework difficulties supply the reader in-depth perform* A CD-ROM with HiWare's specialist C++ compiler is integrated with the ebook* a whole precis bankruptcy on different on hand microcontrollers

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Extra resources for Introduction to Microcontrollers: Architecture, Programming, and Interfacing for the Motorola 68HC12 (Academic Press Series in Engineering)

Example text

If temperature T is measured in degrees Celsius, then the temperature in Fahrenheit is ((T * 9) / 5) + 32. Suppose T, a signed 16-bit number representing degrees Celsius, is in accumulator D. 9 evaluates the formula and leaves the temperature, in Fahrenheit, in accumulator D. 9. 6) are used to set and clear individual bits in A, B, and CCR. They are used by compilers, programs that translate high-level languages to machine code, to manipulate bits to generate machine code. They are used by controllers of machinery because bits are used to turn things on and off.

We now look at a simple example that uses the carry bit C. 9 list two equally good programs to show that there is no way of having exactly one correct answer to a programming problem. After the example, we consider some ways to know if one program is better than another. Suppose that we want to add the two 16-bit numbers in locations $810, $811 and $812, $813, putting the sum in locations $814, $815. For all numbers, the higher-order byte will be in the smaller-numbered location, One possibility for doing this is the following instruction sequence, where, for compactness, we give only the memory location of the first byte of the instruction.

The speed or execution time of a program is prized in applications where the microcomputer has to keep up with a fast environment, such as in some communication switching systems, or where the income is related to how much computing can be done. A faster computer can do more computing and thus make more money. " To show you that this may be irrelevant, we like to tell this little story about a computer manufacturer. This is a true story, but we will not use the manufacturer's real name for obvious reasons.

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