The CPU, which can de considered the heart of the computer system, includes three main components:
1 :Control unit
2 :Arithmetic logic units (ALUs)
3 :Registers
The control unit determines the order in which instruction should
be executed and controls the retrieval of proper operands.
Its interprets the instructions of the machine. The execution of each
instruction is determined by a sequence of control signals produced
by the control unit. ALUs performs all mathematical and Boolean
operations. The registers are temporary storage locations to
quickly store and transfer the data and instructions being used.
Because the registers are often on the same chip and directly
connected to the CU, the registers have faster access time than
memory. Therefore, using registers doth as the source of operands
and as the destination of results will improve the performance. A
CPU that is implemented on a single chip is called microprocessor.
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