A <- A - n - CY
SBC
A,n
| b7 | b6 | b5 | b4 | b3 | b2 | b1 | b0 | |
|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | $DE |
| n | ||||||||
The n integer along with the Carry Flag (C in the F Register) is subtracted from the contents of the Accumulator, and the results are stored in the Accumulator.
| S | is set if result is negative, otherwise it is reset. |
| Z | is set if result is 0, otherwise it is reset. |
| H | is set if borrow from bit 4, otherwise it is reset. |
| P/V | is set if overflow, otherwise it is reset |
| N | is set. |
| C | is set if borrow, otherwise it is reset. |
If the Accumulator contains $23 and the Carry Flag is set then upon the execution of
SBC A,$10
the Accumulator contains $12.