SBC Subtract with Carry
Subtraction with Carry
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
|---|---|---|---|---|---|---|---|---|
| \(A \longleftarrow A - r - Carry\) | ||||||||
| SBC A, r | ||||||||
| 1 | 0 | 0 | 1 | 1 | r | |||
| \(A \longleftarrow A - n - Carry\) | ||||||||
| SBC A,n | ||||||||
| 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | DE |
| \(A \longleftarrow A - (HL) - Carry\) | ||||||||
| SBC A, (HL) | ||||||||
| 1 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 9E |
| \(A \longleftarrow A - (IX+d) - Carry\) | ||||||||
| SBC A, (IX+d) | ||||||||
| 1 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | DD |
| 1 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 9E |
| d | ||||||||
| \(A \longleftarrow A - (IY+d) - Carry\) | ||||||||
| SBC A, (IY+d) | ||||||||
| 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | FD |
| 1 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 9E |
| d | ||||||||
| \(A \longleftarrow A - ss - Carry\) | ||||||||
| SBC HL, ss | ||||||||
| 1 | 1 | 1 | 0 | 1 | 1 | 0 | 1 | ED |
| 0 | 1 | dd | 0 | 0 | 1 | 0 | ||
| Register | r |
|---|---|
| B | 000 |
| C | 001 |
| D | 010 |
| E | 011 |
| H | 100 |
| L | 101 |
| A | 111 |
| Value | dd |
|---|---|
| 00 | BC |
| 01 | DE |
| 10 | HL |
| 11 | SP |
Flags Affected
| Flags |
| ||||||||
|---|---|---|---|---|---|---|---|---|---|
| s | set if result negative | ||||||||
| z | set if result is 0 | ||||||||
| h | set if borrow from bit 4 | ||||||||
| p/v | set if overflow | ||||||||
| c | set if borrow |
Opcode Matrix
| A | B | C | D | E | H | L | (HL) | (IX+d) | (IY+d) | n | BC | DE | HL | SP | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A |
SBC A,A
9F14 |
SBC A,B
9814 |
SBC A,C
9914 |
SBC A,D
9A14 |
SBC A,E
9B14 |
SBC A,H
9C14 |
SBC A,L
9D14 |
SBC A,(HL)
9E17 |
SBC A,(IX+d)
DD9Enn119 |
SBC A,(IY+d)
FD9Enn119 |
SBC A,n
DEnn27 |
|
|
|
|
| HL |
|
|
|
|
|
|
|
|
|
|
|
SBC HL,BC
ED42215 |
SBC HL,DE
ED52215 |
SBC HL,HL
ED62215 |
SBC HL,SP
ED72215 |
|
Instruction
Opcode hexSize bytesCycle count
| Register | Memory | Implicit |
Last modified November 16, 2021: Add flags to math operations (63d34c2)