Central processing unitcomputer that interprets and carries out the instructions contained in the software. In most CPUs, this task is divided between a control unit that directs program flow and one or more execution units that perform operations on data. Almost always, a collection of registers is included to hold operands and intermediate results.
The term CPU is often used vaguely to include other centrally important parts of a computer such as caches and input/output controllers, especially in computers with modern microprocessor chips that include several of these functions in one physical integrated circuit.
Manufacturers and retailers of desktop computers often erroneously describe the system unit (computer case and its contents) as the CPU; rather, the CPU, as a functional unit, is that part of the computer which actually executes the instructions (add, subtract, shift, fetch, etc.).
A family of CPU designs is often referred to as a CPU architecture.
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2 Emerging new CPU architectures include:
3 Historically important CPUs have been:
4 See also
Notable CPU architectures include:
Emerging new CPU architectures include:
Historically important CPUs have been:
CPU design like register size. Today most desktop computers have 32-bit processors; 64-bit processors are being phased in. Smaller devices like mobile phones, PDAss, or portable video game devices may have 16 or 8-bit processors.