Posted on July 05, 2012 at 14:53PC13 - unconnected - input/2M/pullup I also tried floating on this pin. PC14 - ABS25 32.768kHz crystal - input/2M/floating PC15 - other side of crystal - input/2M/floating PI8 - this device does not have t...
Posted on July 05, 2012 at 01:24I verified those bits are enabled. I have not had problems with the RTC or backup SRAM. They just work. My (and others) specific problems are that the backup battery drains very quickly because the VBAT switch is ''ha...
Posted on July 04, 2012 at 21:18An update on my experience with VBAT... My original board had a LTC3973 switching power supply feeding 3.3V. I disconnected and replaced with a linear supply at 3.3V. No change. I am always able to ''fix'' the problem...
Posted on June 02, 2012 at 03:48Does anyone else have this problem or know of a fix for it? I have been able to confirm that I am seeing this exact same behaviour. It has the appearance of a hardware problem with the STM32F4 and I checked the errata...
