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All about PIC microcontrollers

Within these pages, you can find many useful pieces of code mostly in assembly for the Microchip PIC micro controller family. A lot of people have spend many hours trying to put the bits and bytes together. If the code is NOT written by a member of the PCB Heaven community, then a link will be added above the code with the original website that this code was found.
Because the code is copied to our servers, you should know that:

  • The responsible web master of the website that the code is taken, has been informed and he has agreed to copy the code
  • All emails from the above contact have been kept as records but due to personal privacy cannot be shown in public.
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We would personally like to send the credits to all the people that managed to write some very interesting code and publish it, and special thanx to the people that originally hosted those code snippets and gave us the permission to copy them.


View code
16 bit substract with valid carry and zero flag
Author: Christian Blondin
This code was originally located @ http://www.piclist.com


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;------------------------------
;19/6/2006
;code by Christian Blondin
;]b[e]l[t]o[i]d[9]7[@s@p@a@m@]e[m]a[i]l.c]o[m -> delete the [][][[] @spam@
;rsc-mirror3.netfirms.com/pic.html -> coming up.
;
;code is for PIC16 instruction set (PIC10F, 12F, 16F...)
;remove the last two lines if you don't need a valid zero flag.
;performs [f01|f00] = [f01|f00] - [f03|f02] while keeping f03|f02 intact.
;(f00 and f02 being the low-bytes, f01 and f03 the hi-bytes)
;briefly tested in MPSIM ("special cases" only)

movf f02,W
subwf f00,F ;f00-f02 (STATUS,C=!BORROW)
movf f03,W
btfss STATUS,C ;skip if borrow=0 (C=1)
addlw 01
subwf f01,F ;f01-f03 STATUS,C=!BRW
btfsc STATUS,Z ;skip if MSbyte<>zero
movf f00,F ;else, check LSbyte for zero.
;------------------------------

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