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
|file: /Techref/microchip/math/div/32by16ph.htm, 2KB, , updated: 2020/2/12 20:49, local time: 2020/6/2 23:58,
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<A HREF="http://piclist.com/Techref/microchip/math/div/32by16ph.htm"> 32 bits by 16 by Peter Hemsley</A>
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