>What PIC ?   16LF877

>If the pin is at 0V, it is at 0V, It does not "drive" anything
>if there isn't a source of current from a higher voltage. There
>should be no different between grounding the MIC-input and
>connecting it to a PIC pin that is at 0V (if it is...)

I guess that I need to be clear in that I was driving a logic 0 on the port.
And yes, that putting a gnd on the gate of the MIC should be the same as
turning on a low for the port, thus my confusion on it.


>The FET (a p-channel type) is *supposed* to be on with 0V on the gate.

Yes...thats what I meant.  When the gate floats, its pulled up internally to
the source, and then sunk thru the PIC port.

>Maybe you've got it hooked up wrong so the PIC is attempting to sink the
>load current through the gate diode. Just a thought.

No, because I can drive it fine if I either hard ground it, or drive it from
portD, so the wiring is correct.  Just seems that portB can't sink it
enough?

_________________________________________________________________
Click, drag and drop. My MSN is the simple way to design your homepage.
http://click.atdmt.com/AVE/go/onm00200364ave/direct/01/

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics