Real Time Clock (RTC)
The RTC is an independent BCD timer/counter. It provides a time-of-day clock/calendar, two programmable alarms and a programmable periodic wake up timer.
Features
- Time-of-day clock/calendar with subseconds, seconds, minutes, hours (12h/24h format), day (day of week), date (day of month), month, and year
 - Daylight saving compensation.
 - Two programmable alarms (interrupts).
 - Programmable wakeup timer (interrupt).
 - Digital calibration.
 - Runs regardless of device status i.e. also in low-power modes and reset
 
Functions
These functions are available: