The compare channels can be used for
waveform generation on the corresponding port pins. To make the waveform visible on the
connected port pin, the following requirements must be met:
- 1.A Waveform Generation mode must be
selected by writing the WGMODE bit field in TCAn.CTRLB.
- 2.The TCA is counting clock ticks, not
events (CNTEI=0 in TCAn.EVCTRL).
- 3.The compare channels used must be
enabled (CMPnEN=1 in TCAn.CTRLB). This will override the corresponding port pin output
register. An alternative pin can be selected by writing to the respective TCA Waveform
Output n bit (TCA0n) in the Control C register of the Port Multiplexer
(PORTMUX.CTRLC).
- 4.The direction for the associated port
pin n must be configured as an output (PORTx.DIR[n]=1).
- 5.Optional: Enable inverted waveform
output for the associated port pin n (INVEN=1 in PORTx.PINn).