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STM32 RTC Counter value Reset

Question asked by karadag.veysel on Sep 27, 2011
Hi , Im newbie about STM32 . I try to build a calendar project using STM32 discovery board. 

I can read counter value from RS232 port every second. I dissaamble SB1 resistor from discovery board and 3V lithium battery is connected to Vbat and GND. pins.

My problem is, when I cut VUSB or reset board ,  RST counter value is reset and start with zero again. 
I looked  "Using the STM32 hardware real-time clock (RTC)- AN337". Problem is about power mode of STM32.. 

How can I configre power modes or which register to save RTC counter or register with loose USB power. 

Best regards