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The control unit is one of the most important parts of a microprocessor for the reason that it is in charge of the entire process, that is the machine cycle. The CPU deals with each instruction it is given in a series of steps. Each step is repeated for each instruction. This series of steps is called the machine cycle. It involves:

  • fetching an instruction from memory;
  • decoding the instruction;
  • transferring the data;
  • executing the instruction.

The control unit makes sure that all of those actions are carried out. It also manages all the other components on the CPU.

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