To operate the RTC, follow these steps:
- 1.Set the compare value in the Compare
(RTC.CMP) register, and/or the overflow value in the Period (RTC.PER) register.
- 2.Enable the desired interrupts by writing
to the respective interrupt enable bits (CMP, OVF) in the Interrupt Control
(RTC.INTCTRL) register.
- 3.Configure the RTC internal prescaler by
writing the desired value to the Prescaler (PRESCALER) bit field in the Control A
(RTC.CTRLA) register.
- 4.Enable the RTC by writing a
‘
1
’ to the RTC Peripheral Enable (RTCEN) bit in the RTC.CTRLA
register.