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PIC Microcontoller Math Method

32 bits by 16 by Peter Hemsley

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
       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



See also:

file: /Techref/microchip/math/div/32by16ph.htm, 2KB, , updated: 2020/2/12 20:49, local time: 2020/10/29 01:11, owner: JMN-EFP-786,

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<A HREF=""> 32 bits by 16 by Peter Hemsley</A>

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