Difference between revisions of "Central Processing Unit"

From One or Zero Wiki
Jump to navigation Jump to search
(No difference)

Revision as of 08:51, 23 February 2021

Wikipedia Logo White.png

A central processing unit (CPU), also called a central processor, main processor or just processor, is the electronic circuitry within a computer that executes instructions that make up a computer program. The CPU performs basic arithmetic, logic, controlling, and input/output (I/O) operations specified by the instructions in the program. This contrasts with external components such as main memory and I/O circuitry,[1] and specialized processors such as graphics processing units (GPUs).

The computer industry used the term "central processing unit" as early as 1955.[2][3]

The form, design, and implementation of CPUs have changed over time, but their fundamental operation remains almost unchanged. Principal components of a CPU include the arithmetic logic unit (ALU) that performs arithmetic and logic operations, processor registers that supply operands to the ALU and store the results of ALU operations, and a control unit that orchestrates the fetching (from memory) and execution of instructions by directing the coordinated operations of the ALU, registers and other components.

Most modern CPUs are implemented on integrated circuit (IC) microprocessors, with one or more CPUs on a single metal-oxide-semiconductor (MOS) IC chip. Microprocessors chips with multiple CPUs are multi-core processors. The individual physical CPUs, processor cores, can also be multithreaded to create additional virtual or logical CPUs.[4]

An IC that contains a CPU may also contain [memory], peripheral interfaces, and other components of a computer; such integrated devices are variously called microcontrollers or systems on a chip (SoC).

Array processors or [1]s have multiple processors that operate in parallel, with no unit considered central. Virtual CPUs are an abstraction of dynamical aggregated computational resources.[5]

Intel CPU Core i7 6700K Skylake.jpg

An Intel Core i7 6700K

Notable CPU Companies

Company Founded
AMD Logo.png Advanced Micro Devices May 1, 1969, Sunnyvale, CA
Intel Logo.png Intel July 18, 1968, Mountain View, CA
Arm Logo.png arm 27 November 1990

Related links

List of CPUs

  1. Template:Cite book
  2. Template:Cite journal
  3. Template:Cite journal
  4. Cite error: Invalid <ref> tag; no text was provided for refs named intel-pcm
  5. Template:Cite book