Exam1 - Rick Wagoner IET645 Spring 2006 Exam 1 1. Why do we...

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Rick Wagoner IET645 Spring 2006 Exam 1 1. Why do we need interfacing? Interfacing is required because there is a need for information to move in and out of a microprocessor. Since machines do not speak a language easily understood by people and people do not speak a language easily understood by machines an interface is required to perform the necessary translations. Interfaces make the hardware and software more useful and efficient to users. 2. Why do we use microcontroller instead of a microprocessor. A microprocessor is a processor packaged in a single integrated circuit. A processor requires external memory to execute programs, external chips are needed to interface I/O devices, and glue logic is required to tie these all together. These requirements increase size and power consumption which makes them unsuitable for many applications. Microcontrollers solved most of these problems as well as improving hardware design. Microcontrollers are computers implemented on a very large scale integrations chip. Microcontrollers solve microprocessor problems by including memory, timers, converters, and I/O interfaces. Microcontrollers are small are capable of being used practically everywhere. 3. List and explain the addressing modes of 68HC11. Immediate – The actual operand of an instruction opcode and is preceded by the # character while immediately following the opcode. Direct – An opcode operand that is considered to be the least significant byte of
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This note was uploaded on 09/12/2011 for the course EEL 4742 taught by Professor Weeks during the Spring '11 term at University of Central Florida.

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Exam1 - Rick Wagoner IET645 Spring 2006 Exam 1 1. Why do we...

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