23.3.4.4.5 Port Override for Waveform Generation

The TCEn will override the port pin values when the compare channel is enabled (CMPnEN = 1 in the TCEn.CTRLB register) and a Waveform Generation mode is selected.

The timer/counter compare channel will override the port pin output value (OUT) on the corresponding port pin. Enabling inverted I/O on the port pin (INVEN = 1 in the PORTx.PINn register) inverts the corresponding WG output.