2.2.8 Pin Scan

In pin scan mode, the first ADC conversion will begin from the configured positive channel, plus the requested starting offset. When the first conversion is completed, the next conversion will start at the next positive input channel and so on, until all requested pins to scan have been sampled and converted. SAM L21/L22 has automatic sequences feature instead of pin scan mode. In automatic sequence mode, all of 32 positives inputs can be included in a sequence. The sequence starts from the lowest input, and go to the next enabled input automatically.

Pin scanning gives a simple mechanism to sample a large number of physical input channel samples, using a single physical ADC channel.