NEG Negate Accumulator (two's compliment)
\(A \longleftarrow 0 - A\)
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 0 | 1 | 1 | 0 | 1 | ED |
| 0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 44 |
Flags Affected
| Flags |
| ||||||||
|---|---|---|---|---|---|---|---|---|---|
| s | set if result is negative | ||||||||
| z | set if result is 0 | ||||||||
| h | set if borrow from bit 4 | ||||||||
| p/v | set if Accumulator was 0x80 before operation | ||||||||
| n | set | ||||||||
| c | set if Accumulator was not 0x00 before operation |
Opcode Matrix
| NEG | |
|---|---|
| OP |
NEG
ED4424 |
|
Instruction
Opcode hexSize bytesCycle count
| Register |
Last modified November 16, 2021: Misc instructions, merged accumulator & split into separate pages but compact in pdf (49e2ace)