Which among the following registers in the Instruction Cycle holds the last instruction fetched?

1. Memory Address Register (MAR)
2. Instruction Register (IR)
3. Program Counter (PC)
4. Memory Buffer Register (MBR)

Question

Which among the following registers in the Instruction Cycle holds the last instruction fetched?

1. Memory Address Register (MAR)
2. Instruction Register (IR)
3. Program Counter (PC)
4. Memory Buffer Register (MBR)

Accepted Answer

**Solution:**

1. The **Instruction Register (IR)** holds the instruction that has just been fetched from memory and is currently being decoded and executed.

2. The **Memory Address Register (MAR)** holds the address of the memory location to be accessed, either for fetching an instruction or data.

3. The **Program Counter (PC)** holds the address of the next instruction to be fetched, not the last instruction fetched.

4. The **Memory Buffer Register (MBR)** holds the data being transferred to or from the memory, not specifically the instruction.

Therefore, the register that holds the last instruction fetched is the **Instruction Register (IR)**.

**Answer:** Instruction Register (IR)

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