Hi, I have the following questions: 1. - like I can make for not activating the watchdog timer? Whenever I execute my code, the watchdog timer is activated and I cannot disable it, that is to say: The SFR IEN1, in the bit 6 have the "watchdog timer start flag", which I don't have it seteado in my code (SWDT=0, bit 6 of IEN1), and however, the watchdog timer same is activated and me resetea the microcontrolador. !!! It is a problem of the microcontrolador, of the card C509-L, of the program or of the debugger (Keil Software). 2.- Why Reason the compiler assmbly doesn't recognize me the numbers hexadecimals, ej: IEN3 DATA BEH MOV IEN3,#AAH If it recognizes me: IEN3 DATA 80H MOV IEN3,#86H That is to say, it doesn't recognize me the characters A,B,C,D,E and F in Hexadecimal. That I should make?