As far as I understand, decoupling capacitors should be in closed
proximity of power pins of a microcontroller. What is the usual and
practical distance that they are put at?

Although all the power pins need one cap, I have seen designs with
single cap only around 3mm away from a PIC18F6520 non-power pin. Would
that be stable given that PIC18F6520 has 4 sets of power pins?

Thanks,

Chetan Bhargava
http://microz.blogspot.com
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