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about the CPU and its units io unit, control unit and ALU

Central processing unit (CPU)and its units input unit, storage unit, control unit and ALU

The CPU is a main part of the computer. It control all the peripheral device of the mother board.

The primary function of a CPU is to execute instruction or programs. Besides it also controls the operation of all other components, such as memory, input and output devices. Under the processing unit control, Programs and data are accepted from the input devices and stored in the memory. Outputs are displayed on the video screen or printed on paper once the processing of a program is complete.
The processing unit of a small computer normally has a single processor, Whereas the one for a bigger computer may contain a number of processors. Each processor, in a large processing unit, performs a specific task assigned to it.


CPU working


In this figure the solid lines are shows us to indicate the flow of data and also flow of the instruction.
 The dotted lines represents the control exercised by the control unit.
 The figure shows the basic arrangement of different units of a computer.


CPU: The figure shows the Central Processing unit is the combination of the Control unit and Arithmetic logic unit that are connected to each other permanent line as shown in the above figure.

Input Unit: The input unit works with Control Unit, Storage Unit and Arithmetic Logic Unit in the execution of the instructions.

Storage Unit: The storage unit stores the instruction of the input signal or instruction which is controlled by the control unit and calculated by the arithmetic and logic unit in the CPU processing system for making to prepare the output signals or the instructions.

Controls Unit: The control unit controls the instruction of the input signals are where that transfers the in the storage unit and also to set timing of the execution to execute to output signals or instructions.

Arithmetic Logic Unit: In this unit the coming instructions in the storage unit the A.L.U. calculates the instructions in the form of Arithmetic and logical to prepare output form results and after prepare the result the control unit is decides to sends the results to output unit to the resources.

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