Resolved! how to design wakeup voltage of STM32F072xB WKUP PA0 port
from datasheet " The wakeup source from Sleep and Stop mode is an EXTI line configured in event mode.The wakeup source from Standby mode is the WKUP1 pin (PA0); The device exits Standby mode when an external reset (NRST pin), an IWDG reset, a rising ...