23.3.2.2 Clock Selection and Prescalers

The TCD can select between three different clock sources that can be prescaled. There are three different prescalers with separate controls as shown below.
Figure 23-2. Clock Selection and Prescalers Overview

The TCD synchronizer clock is separate from the other module clocks enabling faster synchronization between the TCD domain and the I/O domain. The total prescaling for the counter is:

SYNCPRESC_division_factor × CNTPRESC_division_factor

The delay prescaler is used to prescale the clock used for the input blanking/delayed event output functionality. The prescaler can be configured independently allowing separate range and accuracy settings from the counter functionality.