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Control Unit is the part of the CPU which controls the flow of data and co ordinates other device within it to perform a specific operation. It is said to be "brain within a brain". It receives external signals or commands which it converts into control signal to perform specific series of register transfer level operations.

Since the ALU (Arithmetic Logic Unit) requires the availability of values (operands) in certain registers to perform a specific operations (say addition ), it is the work of CU to make available the operands and store the resulting

answers in resultant register.

A detailed information related to Control Unit Operations and types is available in the related link.

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Q: How does a control unit operate in a computer?
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