I don't know about analog inputs, but on a digital input the input
signal will turn on the input protection diode and try to power the VCC
line, possibly causing the PIC to start running!  It all depends on how
much power is available on that 5V input and what is on the PIC VCC
line.

Sherpa Doug

> -----Original Message-----
> From: Pic Dude [mailto:picdude@AVN-TECH.COM]
> Sent: Wednesday, April 03, 2002 1:01 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: Input signal w/o power...
>
>
> Can I safely send a signal (up to appox 5V) to an analog port
> on a 16F872 or 16F877 when there is no power applied to the
> chip?  Or will this damage the chip?  How about on a digital
> input pin?
>
> Thanks,
> -Neil.
>
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