Figure below is a simplified view of a processor, indicating its connection to the rest of the system via the system bus.
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.
Figure below depicts is a slightly more detailed view of the processor.
The data transfer and logic control paths are indicated, including an element labeled 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. Note the similarity between the internal structure of the computer as a whole and the internal structure of the processor. In both cases, there is a small collection of major elements (computer: processor, I/O, memory; processor: control unit,ALU, registers) connected by data paths.
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