# Atmel AVRMicrocontroller Basic Math Code Library

## Divide 24 by 24 in software by http://elm-chan.org

```;-----------------------------------------------------------------------------:
; 24bit/24bit Unsigned Division
;
; Register Variables
;  Call:  var1[2:0] = dividend (0x000000..0xffffff)
;         var2[2:0] = divisor (0x000001..0x7fffff)
;         mod[2:0]  = <don't care>
;         lc        = <don't care> (high register must be allocated)
;
;  Result:var1[2:0] = var1[2:0] / var2[2:0]
;         var2[2:0] = <not changed>
;         mod[2:0]  = var1[2:0] % var2[2:0]
;         lc        = 0
;
; Size  = 21 words
; Clock = 348..412 cycles (+ret)
; Stack = 0 bytes

div24u:		clr	mod0		;initialize variables
clr	mod1		;  mod = 0;
clr	mod2		;  lc = 24;
ldi	lc,24		;/
;---- calculating loop
lsl	var10		;var1 = var1 << 1;
rol	var11		;
rol	var12		;/
rol	mod0		;mod = mod << 1 + carry;
rol	mod1		;
rol	mod2		;/
cp	mod0,var20	;if (mod => var2) {
cpc	mod1,var21	; mod -= var2; var1++;
cpc	mod2,var22	; }
brcs	PC+5		;
inc	var10		;
sub	mod0,var20	;
sbc	mod1,var21	;
sbc	mod2,var22	;
dec	lc		;if (--lc > 0)
brne	PC-15		; continue loop;
ret

```

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