24.6.5 Events

The RTC can generate the following output events:

  • Overflow (OVF): Generated when the counter has reached its top value and wrapped to zero.
  • Compare (CMPn): Indicates a match between the counter value and the compare register.
  • Alarm (ALARM0): Indicates a match between the clock value and the alarm register.
  • Period n (PERn): The corresponding bit in the prescaler has toggled. Refer to Periodic Intervals for details.
  • Tamper (TAMPER): Generated on detection of a valid signal on a tamper input pin, or tamper event input.

Setting the Event Output bit in the Event Control Register (EVCTRL.xxxEO = 1) enables the corresponding output event. Writing a zero to this bit disables the corresponding output event. Refer to the EVSYS - Event System for details on configuring the event system.

The RTC can take the following actions on an input event:

Writing a one to an Event Input bit into the Event Control register (EVCTRL.xxxEI) enables the corresponding action on input event. Writing a zero to this bit disables the corresponding action on input event.

References:

29 EVSYS – Event System