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arithmetic ins in 8051
- 4. Subtract Example : SUBB A, #0x4F ;A A – 4F – C Notice that There is no subtraction WITHOUT borrow. Therefore, if a subtraction without borrow is desired, it is necessary to clear the C flag. Example : Clr c SUBB A, #0x4F ;A A – 4F SUBB A, byte subtract with borrow
- 7. Multiply When multiplying two 8-bit numbers, the size of the maximum product is 16-bits FF x FF = FE01 (255 x 255 = 65025) MUL AB ; BA A * B Note : B gets the High byte A gets the Low byte
- 9. Decimal Adjust DA a ; decimal adjust a Used to facilitate BCD addition. Adds “6” to either high or low nibble after an addition to create a valid BCD number. Example : mov a, #23h mov b, #29h add a, b; a 23h + 29h = 4Ch(wanted 52) DA a ; a a + 6 = 52