This is good advice, but in general, won't most of us just use the internal pullup, which _is_ through a resistor? -Dave Dan Michaels on 04/07/2000 01:14:26 PM Please respond to pic microcontroller discussion list To: PICLIST@MITVMA.MIT.EDU cc: (bcc: David E Arnold/SYBASE) Subject: Re: pulling outputs to 5 volts? Steven wrote: > > I have seen it everywhere (pull all unused output lines to 5 volts). OK what > if you dont do this? I have one curcuit that seemed to work fine and I did > not pull the outputs up. > Whatever else you do, don't ever pull OUTPUT lines to 5v (or 0v), unless you do it through a resistor. Input lines can be tied directly, but this can still fry you if you accidentally configure the pins as outputs later.