I'm using this crystal to drive my mega644 : http://cfm.citizen.co.jp/english/product/pdf/HC-49_U-S.pdf
I'm using the 14.7456 MHz version of it and I'm seeing my chip freeze every now and then when other activity occurs on the 24V power line that supplies power to a 24V -> 5V power supply that feeds this circuit board. (This activity is a gang of 24VDC contactors that energize every now and then - I don't see any issues on the line with my scope but the energizing is definitely when the freeze occurs but it only happens 5% of the time or so)
This crystal was a replacement for another crystal that was discontinued. I never had freezes when using the other crystal and I was using 18pF caps for it and continued to do so for this new one. Looking at the spec sheet, it looks like I should be using 10pF caps instead.
I'm going to get those smaller caps on order from Digikey and swap them in but I was wondering if this higher capacitance would make this new crystal more susceptible to freezing if the 5V power was a little noisy from time to time due to those contactors energizing.