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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Hardware includes the physical components of a computer, such as the CPU, motherboard, registers, memory, storage devices and peripheral equipment. Software covers system software, application software, utilities, drivers and firmware, with attention to how the operating system manages hardware and how software differs from the physical equipment it controls.
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