The Control Unit receives opcode information from the:
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A.
Accumulator (AC)
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B.
Program Counter (PC)
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C.
Memory Address Register (MAR)
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D.
Instruction Register (IR)
Correct Answer:
D. Instruction Register (IR)
Explanation:
The Control Unit (CU) retrieves opcode data directly from the Instruction Register (IR). During the fetch-decode-execute cycle, an instruction is first pulled from memory and placed into the IR. The CU then examines the bit pattern within the IR to decode the opcode, which identifies the specific operation to be performed. This allows the CU to generate the necessary control signals to coordinate other CPU components, such as the ALU and registers, for the execution of that instruction.
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