# SXMicrocontrollerMathMethod

## 24 bit binary addition

Translated and optimized for the Scenix SX by Nikolai Golovchenko

From: Dwayne Reid

...here is an example that takes the value in R1H,M,L and adds it to the value contained in AD2H,M,L (result in AD2H,M,L). You should be able to see how to extend it to more than 24 bits.

There is a similar version that does subtraction. I often extend to 40 bits or more - its easier to do this when manipulating integer values than it is to try and figure out which bits I can discard.

```;now add new sample
mov	W, R1L		;
add	AD2L, W	;LS byte

mov	W, R1M		;middle byte
snb	C		;take R1M+1 if carry
movsz	W, ++R1M	;if R1M+1==0 skip addition to preserve carry
add	AD2M, W	;

mov	W, R1H		;MS byte
snb	C
movsz	W, ++R1H
add	AD2H, W	;

```

And 24-bit substraction: AD2 = AD2 - R1

```	mov	W, R1L		;
sub	AD2L, W	;LS byte

mov	W, R1M		;middle byte
sb	C		;take middle byte + 1 if borrow
movsz	W, ++R1M	;if R1M+1==0 skip substraction to preserve borrow
sub	AD2M, W	;

mov	W, R1H		;MS byte
sb	C
movsz	W, ++R1H
sub	AD2H, W	;
```

See also:

 file: /Techref/scenix/lib/math/add/24b_sx.htm, 1KB, , updated: 2004/6/10 13:40, local time: 2022/1/26 20:47, TOP NEW HELP FIND:  54.173.214.227:LOG IN

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