ITPEC FE Morning October 2018 Question 10
ITPEC FE Morning October 2018 — Question 10 of 80
Flags Register — stores comparison results and arithmetic sign flags.
The flags register (also called status register or condition code register) holds single-bit flags set automatically after ALU operations:
- •Zero flag (ZF) — result is
0 - •Sign flag (SF) — result is negative
- •Carry flag (CF) — unsigned overflow
- •Overflow flag (OF) — signed overflow
These flags are what if and branch instructions check after a comparison.
Why not others:
- (a) Accumulator — stores the actual computation result, not metadata about it
- (c) Instruction register — holds the current instruction being decoded
- (d) Program counter — holds the address of the next instruction to fetch
Key rule: Flags register = status bits about the result; Accumulator = the result itself.
AI-generated — may contain errors
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