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MICROPROCESSOR
The central brain of the
computer.
More Detailed Definition:
A silicon chip that contains a
CPU. In the world of personal computers, the terms microprocessor
and CPU are used interchangeably. At the heart of all personal
computers and most workstations sits a microprocessor.
Microprocessors also control the logic of almost all digital
devices, from clock radios to fuel-injection systems for
automobiles.
Three basic characteristics differentiate microprocessors:
- Instruction set: The set of instructions that the microprocessor
can execute.
- bandwidth : The number of bits processed in a single instruction.
- clock speed : Given in megahertz (MHz), the clock speed determines
how many instructions per second the processor can execute.
In both cases, the higher the value, the more powerful the CPU.
For example, a 32-bit microprocessor that runs at 50MHz is more
powerful than a 16-bit microprocessor that runs at 25MHz.
In addition to bandwidth and clock speed, microprocessors are
classified as being either RISC (reduced instruction set computer)
or CISC (complex instruction set computer).
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