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 Definitions for central processing unit: WordNet (r) 2.0
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central processing unit
n : (computer science) the part of a computer (a microprocessor
chip) that does most of the data processing; the CPU and
the memory form the central part of a computer to which
the peripherals are attached [syn: CPU, C.P.U., {central
processor}, processor, mainframe]
The Free On-line Dictionary of Computing (27 SEP 03)
:
central processing unit
(CPU, processor) The part of a
computer which controls all the other parts. Designs vary
widely but, in general, the CPU consists of the {control
unit}, the arithmetic and logic unit (ALU) and memory
(registers, cache, RAM and ROM) as well as various
temporary buffers and other logic.
The control unit fetches instructions from memory and decodes
them to produce signals which control the other part of the
computer. This may cause it to transfer data between memory
and ALU or to activate peripherals to perform input or
output.
A parallel computer has several CPUs which may share other
resources such as memory and peripherals.
The term "processor" has to some extent replaced "CPU", though
RAM and ROM are not normally considered as part of a
processor. This is particularly true of common modern
microprocessors though there have been microprocessors which
include RAM and/or ROM on the same integrated circuit.
The CPU Info Center lists many kinds of CPU.
(1998-10-21)
Related SitesPerformance
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