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A processor's integrated circuit that interprets instructions and directs the operation of the rest of the CPU.
Reviewed 26.10.2026 · Version 2 · Scope: España
The control unit receives an instruction from memory, decodes its bits, and generates signals that activate the registers, ALU, and internal buses. It acts as the "brain" that coordinates each processor operation, determining when and how information is moved.
In a hypothetical microcontroller executing an addition instruction, the control unit sends signals to the ALU to perform the operation and then directs the result to the destination register.
Without a control unit, the other processor components would lack clear instructions, and the CPU would be unable to execute programs. It is essential for the proper functioning of any computer.
It is often confused with the arithmetic logic unit (ALU), which performs mathematical operations. The control unit only controls and coordinates; it does not execute calculations.
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