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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
32 bits by 16
Author: Peter Hemsley
This code was originally located @ http://www.piclist.com
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divide movlw 32 ; 32-bit divide by 16-bit
movwf bitcnt
clrf remdrH ; Clear remainder
clrf remdrL
dvloop clrc ; Set quotient bit to 0
; Shift left dividend and quotient
rlf divid0 ; lsb
rlf divid1
rlf divid2
rlf divid3 ; lsb into carry
rlf remdrL ; and then into partial remainder
rlf remdrH
skpnc ; Check for overflow
goto subd
movfw divisH ; Compare partial remainder and divisor
subwf remdrH,w
skpz
goto testgt ; Not equal so test if remdrH is greater
movfw divisL ; High bytes are equal, compare low bytes
subwf remdrL,w
testgt skpc ; Carry set if remdr >= divis
goto remrlt
subd movfw divisL ; Subtract divisor from partial remainder
subwf remdrL
skpc ; Test for borrow
decf remdrH ; Subtract borrow
movfw divisH
subwf remdrH
bsf divid0,0 ; Set quotient bit to 1
; Quotient replaces dividend which is lost
remrlt decfsz bitcnt
goto dvloop
return |
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