24.3.3.1.3 Input Capture on Event Mode

In the Input Capture on Event mode, the counter will count from BOTTOM to MAX. When an event is detected, the Count (TCBn.CNT) register value is transferred to the Compare/Capture (TCBn.CCMP) register, and a CAPT interrupt and event are generated. The Event edge detector can be configured to trigger a capture on either rising or falling edges.

This mode requires TCB to be configured as an event user and is explained in the Events section.

The figure below shows the input capture unit configured to capture the falling edge of the event input signal. The CAPT interrupt flag is cleared automatically after reading the low byte of the Compare/Capture (TCBn.CCMP) register. An OVF interrupt and event are generated when the CNT is MAX.