If I switch to 16Mhz OSC I can get 10-bit resolution at 16kHz:

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So here's the thing: if I set up my ADCIN to use 10-bit then presumably I can get 0-1023 values from my trim pot but since 1000 is the max duty cycle anything above that changes nothing. Will it cause a problem if I pass that in to the duty cycle registers (e.g. 1012) or do I need to set a programmatic limit at 1000? Same applies to 8-bit - max duty cycle is 250 but 8-bit resolution on ADCIN would give me 0-255, so anything greater than 250 does nothing.