To enable asynchronous event detection on an input event, the Event Configuration (CFG) bit field in the corresponding Event Control (TCDn.EVCTRLA or TCDn.EVCTRLB) register must be configured accordingly.
The asynchronous event detection makes it possible to asynchronously override the output when the input event occurs. What the input event will do depends on the input mode. The outputs have direct override while the counter flow will be changed when the event is synchronized to the synchronizer clock (CLK_TCD_SYNC).
It is not possible to use asynchronous event detection and digital filter at the same time.