This question indicates my weakness in the electronics area, but can't help
it.  :-(

In looking through various schematics of one kind or another for the PIC,
as part of my self-education, it seems to me that the values for pull up
(pull down) resistors are all over the map.  I have seen them as low as 470
ohms once, and as high as 10K (don't believe I saw any higher than
that).   Somewhere along the line I saw something which indicated that 10K
is the usual choice.

My electronics experience is strictly through ham radio, and we usually use
just whatever happens to be in the junkbox  and seems to work.  But I would
like to be a little bit more careful with the stuff I am designing now.  So
could someone just tell me the rule of thumb on that?   And what is a "weak
pull up" as described for some of the I/O pins in the datasheet?  I would
assume "weak" means a fairly high resistance, but maybe not.

Thanks,
John

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