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every computer has a central processing unit or CPU in it to perform a specific task.

a CPU contains: datat processing unit and control unit.

the Data Processing Unit consists of Airthmatic logical unit and some registers and the control unit consist of some hardware and software to generate a control signal .

whenever we want to perform some specific task we give computer an instruction or set of instructions called program. the definition of these instructions is stored in the memory of computer. these instruction are processed in a cyecel containing mainly three steps:

1.instruction fetch(taking instruction from memory)

2.instruction decode(understanding the meaning of an instruction)

3.instruction execution(performing the task0

each of above given step contains one or more steps further and these steps are called "microoperationS".

on execution of instruction the specified task is done..

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