Match the following 8085 instructions with the flags : Codes :
2014
Match the following 8085 instructions with the flags :
Codes :
- A.
a-iv, b-i, c-iii, d-ii
- B.
a-iii, b-ii, c-i, d-iv
- C.
a-ii, b-iii, c-i, d-iv
- D.
a-ii, b-iv, c-i, d-iii
Attempted by 54 students.
Show answer & explanation
Correct answer: D
Correct matching: XCHG → No flags are affected; SUB → All flags are affected; STC → Only carry flag is affected; DCR → All flags other than carry are affected.
XCHG: Exchanges DE and HL registers; this swap operation does not modify any processor flags.
SUB: Subtracts a value from the accumulator; it updates all condition flags (Sign, Zero, Auxiliary Carry, Parity and Carry).
STC: Sets the Carry flag to 1; it affects only the carry flag and does not change the other flags.
DCR: Decrements a register or memory by 1; it affects Sign, Zero, Auxiliary Carry and Parity flags but does not alter the Carry flag.