21.3.3.1.4 Input Capture Frequency Measurement Mode

In the Input Capture Frequency Measurement mode, the TCB captures the counter value and restarts on either a positive or negative edge of the event input signal.

The CAPT Interrupt flag is automatically cleared after the low byte of the Compare/Capture (TCBn.CCMP) register has been read.

The figure below illustrates this mode when configured to act on the rising edge.

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