Question
Download Solution PDFThe status of CY, AC, P and S for the following program in 8085 microprocessor is:
MVI A, 8FH
MVI B, 68H
ADD B
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFProgram:
MVI A, 8FH ; Load accumulator A with 8FH = 100011112 MVI B, 68H ; Load register B with 68H = 011010002 ADD B ; A = A + B = 8FH + 68H
Step 1: Perform Addition
8FH = 143D
68H = 104D
143 + 104 = 247D = F7H = 111101112
Step 2: Evaluate Flags
- Carry (CY): No carry from 8-bit addition → CY = 0
- Auxiliary Carry (AC): Lower nibble: FH(1111) + 8H(1000) = 0111 with a carry from bit 3 to bit 4 → AC = 1
- Sign Flag (S): MSB of result F7H is 1 → S = 1
- Parity Flag (P): F7H = 11110111 has 7 ones → odd parity → P = 0
Last updated on Jul 15, 2025
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