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processor

by admin on Feb.06, 2009, under Computer, hardware

processor

We mean here central processing unit (CPU) is an mechanical cog that can execute computer programs. Modern microprocessors appear in everything from automobiles to cell phones to children toys.

The fundamental operation of most CPUs, regardless of the physical form they take, is to execute a sequence of stored instructions called a program. The program is represented by a series of numbers that are kept in some kind of computer memory. There are four steps that nearly all CPUs use in their operation: fetch, decode, execute, and writeback.

fetch: involves retrieving an instruction (which is represented by a number or sequence of numbers) from program memory.

decode : the instruction is broken up into parts that have significance to other portions of the CPU .

execute : various portions of the CPU are connected so they can perform the desired operation. If, for instance, an addition operation was requested, an arithmetic logic unit (ALU) will be connected to a set of inputs and a set of outputs.

writeback : writes back the results of the execute step to some form of memory .

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