From: Kevin Blain
; Multi-byte add routine. ; requires number of registers, start register address ; affects w, FSR / INDF and status ; result in N_hi and N_lo movlw number_of_registers movwf counter ; used to count how many successive registers to add together movlw start_register_address movwf fsr ; used FSR and INDF to address successive memory locations clrf N_hi ; start with zero in N_hi and N_lo clrf N_lo loop: movf INDF,w ; get latest byte to add in addwf N_lo,f ; add to low order byte skpnc ; test carry, if set, increment the hi order byte incf N_hi,f incf FSR,f decfsz counter ; if counter is >1 then repeat loop goto loop ; counter is zero, N_hi and N_lo contain reasult, w has changes tolast value, FSR has last pointer ; total routine size 13 words. ; execution time 4+ (10 x number of resisters) cycles
|file: /Techref/microchip/math/add/xBkb.htm, 5KB, , updated: 2011/2/10 08:40, local time: 2023/12/11 11:59,
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<A HREF="http://techref.massmind.org/techref/microchip/math/add/xBkb.htm"> PIC Microcontoller Math Method xByte Addition</A>
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