40.6.2.4 Prescaler Selection

The ADC is clocked by GCLK_ADC. There is also a prescaler in the ADC to enable conversion at lower clock rates. Refer to CTRLB for details on prescaler settings. Refer to 40.6.2.8 Conversion Timing and Sampling Rate for details on timing and sampling rate.

Note: The minimum prescaling factor is DIV2.

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