AnsweredAssumed Answered

Use of RTC in back up domain

Question asked by pai.rohit on Apr 9, 2014
Latest reply on Jun 6, 2014 by sung.chen_chung
Hello All,

I have read from STM324xx data sheet that the RTC is registers are still valid and running when Vdd is off and Vbat is present. I am not sure how the microcontroller manges normal running mode and standby mode (Vdd is off and Vbat is present). 

I have two questions
1. Is it responsibility of FW to manage the switch or is is managed by the MCU hardware.? When Vdd is off and Vbat is present does the microcontroller automatically goes to standby mode..? Do we need any kind of configuration for this...?
2. How to know after power start whether the product up from a stand by mode or a power down reset. 

Thnaks for any kind of suggestion.

BR,
Rohit 

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