Is there any recommendation on what to do with the unused pins on a PIC 
to limit potential problems and/or unneeded power drain?  I.E. tie them 
to ground, tie them to VCC, let them float, set them all to outputs, 
etc.   Most IC's seem to have a recommendation this way (I.E. tie unused 
inputs to ground, or specific recommendations for specific pins), but I 
don't seem to be able to locate any for the PIC's.

I'm looking for both the official recommendation (if there is one), and 
what others have done and whether or not it's caused problems.

Thanks.

-forrest
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