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All about PIC microcontrollers

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.
Because the code is copied to our servers, you should know that:

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We would personally like to send the credits to all the people that managed to write some very interesting code and publish it, and special thanx to the people that originally hosted those code snippets and gave us the permission to copy them.


View code
xByte Addition
Author: Kevin Blain
This code was originally located @ http://www.piclist.com


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; 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

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