posted to PICList Mon Aug 4 09:29:57 1997
Clyde Smith-Stubbs
HI-TECH
Software,
http://www.htsoft.com/
; Word multiplication for PIC 16C5x #ifdef _PIC12 psect text,class=ENTRY,delta=2 #else psect text,class=CODE,delta=2 #endif global awmul,lwmul ; The main multiply thingo. Called with one operand in btemp and the ; other in btemp+2. It really doesn't matter which one is where. ; The multiplier is copied to plier, and the product built up in ; acca where it belongs STATUS equ 3 C equ 0 Z equ 2 lwmul awmul clrf prod ;initialize product clrf prod+1 loop bcf STATUS,C ;clear carry again rrf plier+1 ;shift multiplier down rrf plier btfss STATUS,C ;skip if multiplier lsb not set goto lop1 movf btemp,w ;add multiplicand to product addwf prod movf btemp+1,w btfsc STATUS,C incf btemp+1,w addwf prod+1 lop1 bcf STATUS,C ;clear carry rlf btemp ;shift multiplicand up rlf btemp+1 movf plier,w iorwf plier+1,w btfss STATUS,Z ;test for early return goto loop retlw 0 ;done, result in prod psect temp,global,class=BANK0,space=1,ovrld btemp ds 2 plier ds 2 prod ds 2 global used_btemp0 global used_btemp1 global used_btemp2 global used_btemp3 global used_btemp4 global used_btemp5 end
file: /Techref/microchip/math/mul/16x16ht.htm, 1KB, , updated: 2000/2/11 14:52, local time: 2024/11/8 14:21,
3.144.6.223:LOG IN ©2024 PLEASE DON'T RIP! THIS SITE CLOSES OCT 28, 2024 SO LONG AND THANKS FOR ALL THE FISH!
|
©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://ecomorder.com/techref/microchip/math/mul/16x16ht.htm"> PIC Microcontoller Math Method 16x16 multiplication from HI-TECH C library</A> |
Did you find what you needed? |
Welcome to ecomorder.com! |
Welcome to ecomorder.com! |
.