The RTC can generate the following output events:
- Overflow (OVF): Generated when the
counter has reached its top value and wrapped to zero.
- Tamper (TAMPER): Generated on detection of
valid signal on a tamper input pin or tamper event input.
- Compare (CMP0-1): 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 (PER0-7): The corresponding
bit in the prescaler has toggled. Refer to Periodic Intervals for details.
- Periodic Daily (PERD): Generated when the COUNT/CLOCK has incremented at a fixed period
of time.
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:
- Tamper (TAMPEVT): Capture the RTC counter to the timestamp register. See Tamper
Detection.
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.