keep in mind AN552 refers to ancient technology that has no esd protection of any kind [like esd diodes], with contemporary chips i would expect no trouble either.
Ther only way high current may damage the input pin is by inducing that current from an external source. I do not know how is your settup exctly, but if you do have long wires or nearby high voltage...
I have been playing with MIBAM from Darrel Taylor and it works perfectly.
However, i was trying to get the cyclon effect at one point and a full fade-in or fade-out of all the same LEDs...
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...
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Re: Pull down button on Port B
keep in mind AN552 refers to ancient technology that has no esd protection of any kind [like esd diodes], with contemporary chips i would expect no trouble either.
richard - 23rd January 2026, 22:43