When we use this chip, we encountered the following problems：
1 How long did it take to switch the Swtiched Power（VTP<= 2.6V）?
2 What circumstances the Oscillator Enable bit（OSEN-----register 01h bit 7）becomed 1?
3 The battery has electricity, but the time is 2099 or 2050,why?The battery is SL-840P(Manufacturer：Tadiran Batteries).
Looking forward to your reply，thanks!
1. RTC will continue working when VDD cross VTP.
2. The default status of this bit is 1.
3. The date/time need to to set up when the chip powered after assembled on the circuit board.
This apps note can help to understanding the usage of the device, if you were not aware: