37.5.4 Selecting the Conversion Trigger Source

Class 1 and Class 2 inputs to the ADC core can be triggered for conversion either individually or as part of a scan sequence. Class 3 inputs can only be triggered as part of a scan sequence. Individual or scan triggers can originate from an event system (EVSYS), from external digital circuits connected to INT0, or through software by setting a trigger bit in an SFR.

Note: When conversion triggers for multiple Class 2 analog inputs occur simultaneously, they are prioritized according to a natural order priority scheme based on the analog input used. AN1 has the lowest priority, AN2 has the next higher priority and so on.