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.
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; 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
clrf prod ;initialize product
bcf STATUS,C ;clear carry again
rrf plier+1 ;shift multiplier down
btfss STATUS,C ;skip if multiplier lsb not set
movf btemp,w ;add multiplicand to product
bcf STATUS,C ;clear carry
rlf btemp ;shift multiplicand up
btfss STATUS,Z ;test for early return
retlw 0 ;done, result in prod