;-----------------------------------------------------------------------------:
; 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
See also:
| file: /Techref/atmel/avr/div24x24sw-ec.htm, 1KB, , updated: 2007/9/14 17:14, local time: 2012/2/10 09:03,
38.107.179.232:LOG IN |
| ©2012 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions? <A HREF="http://www.piclist.com/techref/atmel/avr/div24x24sw-ec.htm"> Atmel AVR, atmega, Microcontroller, embedded controller, math, division, 24x24, elm-chan.org</A> |
| Did you find what you needed? |
LCD Front Panel Set: $8.99!
- 2x16 LCD HD44780 controller - 4 push buttons - 3 LEDs - 2x12 header |
|
.