Question

A set of microinstructions for a single machine instruction is called ............

• A. Program
• B. Command
• C. Micro program
• D. Micro command

Hint:

A micro program controls hardware at the most basic level — it’s the firmware logic behind each machine instruction.

Answer 1

The Correct Option is C

Step 1: In computer architecture, a microinstruction is the lowest-level instruction that defines specific control signals to operate the CPU hardware for one clock cycle.
Step 2: A sequence of such microinstructions that together execute a single machine-level instruction is known as a micro program.
Step 3: Micro programs are stored in the control memory of a CPU and are executed by the control unit to perform operations like fetching, decoding, and executing machine instructions.
Step 4: Other options:
- (A) A Program is a collection of multiple instructions to perform a task — higher level than a micro program.
- (B) A Command generally refers to a user instruction given to a system.
- (D) Micro command is not a standard term in CPU architecture.
Thus, the correct choice is $\mathbfMicro\ program$.