By: Andy Warren From: http://www.myke.com/basic.htm
an algorithm from Andy Warren for dividing a positive value by three, by knowing that divide by three can be represented by the series:
x/3 = x/2 - x/4 + x/8 - x/16 + x/32 - x/64...
The code to implement this is:
Div3: ; Divide Contents of "w" by 3 movwf Dividend clrf Quotient Div3_Loop ; Loop Until the Dividend == 0 bcf STATUS, C rrf Dividend, f ; Dividend /2 (ie "x/2" in Series) movf Dividend, w ; Is it Equal to Zero? btfsc STATUS, Z goto Div3_Done ; If it is, then Stop addwf Quotient ; Add the Value to the Quotient rrf Dividend, f ; Dividend /2 (ie "x/4" in Series) movf Dividend, w btfsc STATUS, Z goto Div3_Done subwf Quotient, f ; Quotient = Quotient-(Dividend / 4) goto Div3_Loop Div3_Done movf Quotient, w ; Return the Quotient return
file: /Techref/microchip/math/div/8byconst3-aw.htm, 1KB, , updated: 2011/1/17 23:59, local time: 2024/8/14 19:44,
18.188.99.234:LOG IN
|
©2024 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://massmind.org/techref/microchip/math/div/8byconst3-aw.htm"> PIC Microcontoller Math Method </A> |
Did you find what you needed? |
Welcome to massmind.org! |
Welcome to massmind.org! |
.