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| UM10562 Datasheet, PDF (780/942 Pages) NXP Semiconductors – LPC408x/407x User manual | |||
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NXP Semiconductors
UM10562
Chapter 29: LPC408x/407x Real Time Clock (RTC)
29.7 RTC usage notes
If the RTC is used, VBAT may be connected to an independent power supply (typically an
external battery), or left floating. The RTC domain will always be internally powered if
VDD(REG)(3V3) is present, even if there is no power applied to VBAT. As long as power is
available on either VDD(REG)(3V3) or VBAT, the RTC will not lose its time value and backup
register contents. If both VDD(REG)(3V3) and VBAT are not present, all RTC information will
be lost. The RTC will stop incrementing or be unpredictable if the clock source is lost,
interrupted, or altered. The Event Recorder is powered in the same manner as the RTC.
UM10562
User manual
All information provided in this document is subject to legal disclaimers.
Rev. 1 â 13 September 2012
© NXP B.V. 2012. All rights reserved.
780 of 942
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