ITPEC IP October 2023 Question 10
ITPEC IP October 2023 — Question 10 of 100
The processor first reads the instruction identified by the program counter and then decodes it before execution. The program counter supplies the memory address. The instruction is fetched or read from that address, the counter is advanced to the next instruction, the fetched instruction is decoded to determine the required operation and operands, and the operation is executed. Therefore A is Read and B is Decode.
Answer (b)
Why not others:
- (a) reverses fetch and decode; an instruction cannot be decoded before it is read
- (c) decoding is required, while writing is not a universal step for every instruction
- (d) the instruction is not written to memory as the initial fetch step
Key rule: The basic instruction cycle is fetch, advance the program counter, decode, and execute.
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