Pak Exam MCQs
A. PC
B. IR
C. MBR
D. MAR
Answer & Solution
Option: B
Explanation :The IR which stands for the instruction register contains the last instruction fetched.
The instruction register (IR) or current instruction register (CIR) is the part of a CPU’s control unit that holds the instruction currently being executed or decoded.
An instruction register holds a machine instruction that is currently being executed. In general, a register sits at the top of the memory hierarchy. A variety of registers serve different functions in a central processing unit (CPU) – the function of the instruction register is to hold that currently queued instruction for use.
All the others options are registers which are used for the fetch operation.
Explanation :The IR which stands for the instruction register contains the last instruction fetched.
The instruction register (IR) or current instruction register (CIR) is the part of a CPU’s control unit that holds the instruction currently being executed or decoded.
An instruction register holds a machine instruction that is currently being executed. In general, a register sits at the top of the memory hierarchy. A variety of registers serve different functions in a central processing unit (CPU) – the function of the instruction register is to hold that currently queued instruction for use.
All the others options are registers which are used for the fetch operation.
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