Which register is responsible for decoding the instruction and processor execution?
Correct answer: A. Instruction Register (IR)
- A. Instruction Register (IR)
- B. Program Counter (PC)
- C. Memory Address Register (MAR)
- D. Memory Buffer Register (MBR)
Explanation
The correct answer is: (a) IR.The IR stores the instruction that is currently being decoded and executed by the CPU. Once the instruction is fetched from memory by the control unit (CU), it is loaded into the IR for processing. The CU retrieves the instruction from the IR and breaks it down into its component parts (opcode, operands) to determine what operation needs to be performed and what data is involved.
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