Free running mode is selected. If both capture circuits are enabled, then capture circuit 0 is armed first after CAPTCTRLA[ARMA] is set. Once a capture occurs, capture circuit 0 is disarmed and capture circuit 1 is armed. After capture circuit 1 performs a capture, it is disarmed and capture circuit 0 is re-armed. The process continues indefinitely.If only one of the capture circuits is enabled, then captures continue indefinitely on the enabled capture circuit.
One shot mode is selected. If both capture circuits are enabled, then capture circuit 0 is armed first after CAPTCTRLA[ARMA] is set. Once a capture occurs, capture circuit 0 is disarmed and capture circuit 1 is armed. After capture circuit 1 performs a capture, it is disarmed and CAPTCTRLA[ARMA] is cleared. No further captures will be performed until CAPTCTRLA[ARMA] is set again.If only one of the capture circuits is enabled, then a single capture will occur on the enabled capture circuit and CAPTCTRLA[ARMA] is then cleared.