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The Control UnitThe control unit is the “policeman” or “traffic manager” of the CPU. It monitorsthe execution of all instructions and the transfer of all information. The controlunit extracts instructions from memory, decodes these instructions, making suredata is in the right place at the right time, tells the ALU which registers to use,services interrupts, and turns on the correct circuitry in the ALU for the executionof the desired operation. The control unit uses a program counter register to findthe next instruction for execution and a status register to keep track of overflows,carries, borrows, and the like. Section 4.7 covers the control unit in more detail.
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