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** RTC battery is used: PMIC RTC peripheral keeps hardware clock alive when OS isn't running and backup battery powers the backup state as far as the input voltage is high enough.
IGEP Boards use as a source clock a 32.768kHz crystal. This passive component can add clock drifts due:
*General drift error
*Ambient temperature error
*Aging error
* ...
Some software tools can be used to compensate these errors.
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