ITPEC IP April 2018 Question 12
ITPEC IP April 2018 — Question 12 of 100
The CPU first reads the instruction and then decodes it, so A is Read and B is Decode. The program counter supplies the address for fetching the instruction from memory. After the counter is advanced to the next address, the control unit interprets the fetched instruction before executing it.
Answer (b)
Why not others:
- an instruction cannot be decoded before it has been read
- writing is not the required stage between consulting the program counter and execution
- the alternatives reverse or replace essential fetch-and-decode operations
Key rule: The basic instruction cycle is fetch, advance the program counter, decode, and execute.
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