1) Yes.. you should write 0ffh again

2) I guess it uses bank 0 by default, but why take the chance? Initialize everything once u start-up.

3) You could go into idle or power down mode and wait for an interrupt to wake you up.

4) Of course. Depending on how much stack you have....Is this H/W ????? :-))

Before somebody else says it... Read the '51 bible!

kundi