What happens if you execute SUBB A, #10H with A=15H but forget to clear the carry flag (C=1 from a previous operation)?

Question

Accepted Answer

The result will be 0x04 instead of the expected 0x05, because SUBB subtracts both the operand AND the carry flag (15H - 10H - 1 = 04H)

Answer

The operation will fail and set an error flag because C must be 0 for SUBB

Answer

The result will be correct (0x05) because SUBB automatically clears C before operation

Answer

C=1 indicates the previous result was negative, so the current subtraction adds instead

Crowdly