Posted on September 27, 2011 at 10:23Hi , 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
