Posted on May 22, 2015 at 08:59Hi all, From the STM32F100xx Reference manual, the RCC_CFGR2's bit 0 is same as RCC_CFGR's bit 17.And at our company's one product(which use STM32F100ZCT6) it work right. when CFGR change, the CFGR2 changed too.But at ...