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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
24 bits by 24
Author: Tony Nixon
This code was originally located @ http://www.piclist.com
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;
------------------------------------------
; SUBROUTINE - 24 BIT DIVISION
; numerator: nratorH nratorM nratorL
; denominator: denomH denomM denomL
;
; result: nratorH nratorM nratorL
; remainder: remainH remainM remainL
;
divizn movlw .24
movwf BCount
movf nratorH,w
movwf shiftH
movf nratorM,w
movwf shiftM
movf nratorL,w
movwf shiftL
clrf nratorH
clrf nratorM
clrf nratorL
;
clrf remainH
clrf remainM
clrf remainL
dloop bcf status,carry
rlf shiftL
rlf shiftM
rlf shiftH
rlf remainL
rlf remainM
rlf remainH
movf denomH,w
subwf remainH,w
btfss status,z
goto nochk
;
movf denomM,w
subwf remainM,w
btfss status,z
goto nochk
;
movf denomL,w
subwf remainL,w
nochk btfss status,carry
goto nogo
;
movf denomL,w
subwf remainL
btfss status,carry
decf remainM
movf remainM,w
xorlw 0xff
btfsc status,z
decf remainH
movf denomM,w
subwf remainM
btfss status,carry
decf remainH
movf denomH,w
subwf remainH
bsf status,carry
nogo rlf nratorL
rlf nratorM
rlf nratorH
decfsz BCount
goto dloop
;
return |
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