list p=16F84A
#include <p16f84a.inc>
RES_VECT TD1EX1 0x0000
GOTO START
CBLOCK 0x0C
X1
X2
X3
Y
ENDC
MAIN_PROG TD1EX1
START
BSF STATUS, RP0
MOVLW 0
MOVWF TRISB
BCF STATUS, RP0
GOTO MAIN
MAIN
MOVLW 10
MOVWF X1
MOVLW 12
MOVWF X2
MOVLW 14
MOVWF X3
ADDWF X1, W
ADDWF X2, W
MOVWF Y
CLRW
MOVF Y, PORTB
CLRW
END
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