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), decoding and execution (of instructions) by directing the coordinated operations of the ALU, registers, and other components. The form, design, and implementation of CPUs have changed over time, but their fundamental operation remains almost unchanged. This role contrasts with that of external components, such as main memory and I/O circuitry, and specialized coprocessors such as graphics processing units (GPUs). Its electronic circuitry executes instructions of a computer program, such as arithmetic, logic, controlling, and input/output (I/O) operations.
Bottom side of an Intel 80486DX2, showing its pinsĪ central processing unit ( CPU)-also called a central processor or main processor-is the most important processor in a given computer.
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