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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.
  • The author of the code is always clearly indicated above the code. In some cases the author is unknown. If you happen to be the author of the code or you know the person who wrote it, please inform us by email and it will be added ASAP.

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
4bit X 4bit
Author: John Payson
This code was originally located @ http://www.piclist.com


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; 4x4 bit multiply
; result in W
movlw 0
bcf C
btfss n1,0
addwf n2,w
rlf n2,f
btfss n1,1
addwf n2,w
rlf n2,f
btfss n1,2
addwf n2,w
rlf n2,f
btfss n1,3
addwf n2,w
rlf n2,f
swapf n2,f
; 15 cycles, putting the result in W and
; leaving n1 and n2 untouched at the end.
; Striking the requirement that n2 be untouched would save the
; last two cycles.
; Note that if n1<=15 and n1*n2<=255 this routine will ; produce a correct result even if n2>15;
; the value in n2 will be trashed in such a case, though.

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