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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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 n2...
swapf n1,w ; Assume top 4 bits zero
btfss n2,0
addwf n2,f
rrf n2,f
If we have Cy=1 before entering this code fragment and we skip first addition we'll got error.
btfss n2,0
addwf n2,f
rrf n2,f
btfss n2,0
addwf n2,f
rrf n2,f
btfss n2,0
addwf n2,f
rrf n2,f
; 13 cycles, leaving the result in n2.
; This one won't work if either factor is oversized. |
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