PIC Assembly For Loop Example

Code:

for i = n1 to n2

Code:

#include <p18F8720.inc>
radix dec
n equ D'50'
sum_hi set 0x01 ; high byte of sum
sum_lo set 0x00 ; low byte of sum
i set 0x02 ; loop index i
org 0x00 ; reset vector
goto start
org 0x08
retfie
org 0x18
retfie
start clrf sum_hi,A ; initialize sum to 0
clrf sum_lo,A ; 
clrf i,A ; initialize i to 0
incf i,F,A ; i starts from 1
sum_lp movlw n ; place n in WREG
cpfsgt i,A ; compare i with n and skip if i > n
bra add_lp ; perform addition when i less or equal 50
bra exit_sum ; it is done when i > 50
add_lp movf i,W,A ; place i in WREG
addwf sum_lo,F,A ; add i to sum_lo
movlw 0
addwfc sum_hi,F,A ; add carry to sum_hi
incf i,F,A ; increment loop index i by 1
bra sum_lp
exit_sum nop
bra exit_sum
end

_________________
M. S. Rakha, Ph.D.
Queen's University
Canada

Author: DrRakha
Mastermind

Posts: 2715
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