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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:

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  • 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
8bit X 8bit
Author: Scott Dattalo
This code was originally located @ http://www.piclist.com


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;
; Multiply x*y and produce a 16bit result. The high byte of the
;result is aliased with x.
;

multiply
movf x,w ;; or save a cycle by letting the caller init. ;)

clrc
clrf res_lo

btfsc y,0
goto l0

btfsc y,1
goto l1

btfsc y,2
goto l2

btfsc y,3
goto l3

btfsc y,4
goto l4

btfsc y,5
goto l5

btfsc y,6
goto l6

btfsc y,7
goto l7

clrf x ;Dmitry Kiryashov says: otherwise y==0 but x isn't

goto l8 ;; or return


l0 rrf x,f
rrf res_lo,f

btfsc y,1
addwf x,w

l1 rrf x,f
rrf res_lo,f

btfsc y,2
addwf x,w

l2 rrf x,f
rrf res_lo,f

btfsc y,3
addwf x,w

l3 rrf x,f
rrf res_lo,f

btfsc y,4
addwf x,w

l4 rrf x,f
rrf res_lo,f

btfsc y,5
addwf x,w

l5 rrf x,f
rrf res_lo,f

btfsc y,6
addwf x,w

l6 rrf x,f
rrf res_lo,f

btfsc y,7
addwf x,w

l7 rrf x,f
rrf res_lo,f


l8 return

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