When I recently built my 328PB breakout board I noticed that the 22pf resonance capacitors are the maximum value of the recommended 12-22pf range. But the pin capacitance is also 6pf, so in fact 22pf may be too high.
I'd like to do some testing with lower value capacitors (e.g. 10pf) to see if that gives me a more resilient resonance.
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