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Maintains the real time, even when the device is off (powered-off).
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Has the capability to generate an alarm at a specific time and date.
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Includes the means for periodic software calibration of the RTC.
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Includes logic to correct the static fractional inaccuracy of the oscillator.
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Keeps track of time within a window of more than 136 years (232 seconds) from a reference point.
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Implemented as three counters.
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16-bit tick counter creates one second based on the crystal clock.
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4-bit fraction counter keeps track of the static crystal errors in one second that is less than one oscillator tick.
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32-bit seconds counter holds the real time and allows on-demand reload whenever current time of the RTC is set.
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Allows wake-up at a specific second within the 136 years (32-bit alarm)