LIST P=16F877A            ; Using PIC16F877A microcontroller
        #INCLUDE <P16F877A.INC>   ; Include header file
 
        ORG 00                    ; Start of program memory
DATA1   EQU 40                    ; Location to keep count (N)
SUM     EQU 50                    ; Location to store result
 
        GOTO MAIN                 ; Jump to MAIN program
 
        ORG 30                    ; Code starts here
 
MAIN    MOVLW 0x41                ; Load starting address of numbers
        MOVWF FSR                 ; Put it in FSR (pointer to numbers)
 
        MOVLW 00                  ; Clear W (this will hold SUM = 0)
 
LOOP    ADDWF INDF,0              ; Add number at FSR to W
        INCF FSR                  ; Go to next number
        DECFSZ DATA1,1            ; Decrease counter (N)
        GOTO LOOP                 ; If not 0 → repeat
 
        MOVWF SUM                 ; Store result in SUM location
HLT     GOTO HLT                  ; Stop program
 
        END

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