(Got this reply personaly, but I see no reason why it
coudn't be on-list.)

Brooke Clarke wrote :

> Maybe I didn't use the correct word "Phantom".
>
> For example the clock signal is a sine wave with 1 volt pk - pk
> (well below Vcc of 5 volts), yet if the clock is connected prior to
> the +5 volts the chip does not work properly.  But if the +5 is
> connected first or MCLR is pulsed low , then all is well.

Yes, but the problem isn't when Vcc is 5V, it's when Vcc is 0 volt.
At *that* time you're violating the "absolute maximum" in the
data sheet, and the processor doesn't startup as it should (but
I guess just about anything could happen since you're outside
of the specs anyway).

Jan-Erik.



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