Oh,

Only portB has pullups built in? Good to know.

-Dave





Dan Michaels <oricom@LYNX.SNI.NET> on 04/07/2000 05:52:13 PM

Please respond to pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>

To:   PICLIST@MITVMA.MIT.EDU
cc:    (bcc: David E Arnold/SYBASE)
Subject:  Re: pulling outputs to 5 volts?




At 03:40 PM 4/7/00 -0700, you wrote:
>This is good advice, but in general, won't most of us just use the internal
>pullup, which _is_
>through a resistor?
>
>-Dave
>

Only on port B, I believe.
=============

>
>
>Dan Michaels <oricom@LYNX.SNI.NET> on 04/07/2000 01:14:26 PM
>
>Please respond to pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
>
>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.
>