thanks Richard for the reply. My point is to limit the current surge when the PortB pin drops from 5v to 0v at the button push. My thinking is there is a spike of current that may damage the PortB...
Using weak pullups on port B of 16f1936. A button to ground will cause an interrupt on IOCBN.
Question: should I use a low value resistor in line with this pull down button?
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Re: Pull down button on Port B
Solved: Microchip Applacation note AN552
MOUNTAIN747 - 18th January 2026, 18:31"The series 100Ω resistors are used for Electrostatic Discharge (ESD) protection."
OK, I think I was on the right track. In fact I was considering 100Ω...