ORG 0000h ; Start of program
MOVLW 0x0A ; Load the value 0x0A into WREG
MOVWF 0x20 ; Move the value from WREG to register 0x20
MOVLW 0x03 ; Load the value 0x03 into WREG
SUBWF 0x20, W ; Subtract the value in WREG from register 0x20, result in WREG
GOTO $ ; Infinite loop to stop the program
END ; End of program