That portion of a computer that fetches and executes
instructions. It consists of an Arithmetic and Logic Unit (ALU), a control
unit, and registers. Often simply referred to as a processor.
The figure shows a detailed view of the internal
organization of processor. The major components of the processor are an
arithmetic and logic unit (ALU) and a control unit (CU). The ALU does the
actual computation or processing of data. The control unit controls the
movement of data and instructions into and out of the processor and controls
the operation of the ALU. In addition, the figure shows a minimal internal
memory, consisting of a set of storage locations, called registers.
The data transfer and logic control paths are indicated,
including an element labelled internal
processor bus. This element is needed to transfer data between the
various registers and the ALU because the ALU in fact operates only on data in
the internal processor memory. The figure also shows typical basic elements
of the ALU.
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