Hello @ASEHST , Your fix worked for me, suspend systick before entering into STOP3 mode. But currently I'm working with Zephyr RTOS and using STM32 HAL drivers to enter into STOP3 mode, with zephyr 3.2.0 version we got same issue as control is coming...

I am working with STM32 U575/U5A5 series of STM32 controllers in low power mode. I have programmed the controller to enter into Stop 3 mode and wake from stop3 mode based on wakeup Pin(High on PF2). once immediately flashing hex file into controller ...