Condition Clearing

The CFD condition is cleared after a Reset, the monitored source starts toggling again, or the CFD flag in the Main Clock Interrupt Flags (CLKCTRL.MCLKINTFLAGS) register is set. Note that as long as the failure condition is met, the interrupt will trigger every ten OSC32K cycles. If these repeated interrupts are not desired, write a ‘0’ to the Clock Failure Detection (CFD) interrupt enable bit in the Main Clock Interrupt Control (CLKCTRL.MCLKCTRL) register. If it is the main clock that is being monitored, changing back to the default start-up clock will make the main clock start toggling again, clearing the condition.