33.5.3 Accumulate Mode

In Accumulate mode (ADMD = 001), after every conversion, the ADC result is added to the ADACC register. The ADACC register is right-shifted by the value of the ADCRS bits. This right-shifted value is copied in to the ADFLT register. The Formatting mode does not affect the right-justification of the ADACC value. Upon each sample, ADCNT is also incremented, incrementing the number of samples accumulated. After each sample and accumulation, the ADACC value has a threshold comparison performed on it (see 33.5.7 Threshold Comparison) and the ADTIF interrupt may trigger.