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 1. 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:
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.