how to implement 5s key press wakeup under stop mode?

[David.Cheng]

..

[JoniS]

Wake up from the keypress and continue sampling the button state if it's long enought high/low , wake up else go back to sleep after the button is released.​

[David.Cheng]

it seems that it will wakeup until key released for stm8, what if stm32?

[JoniS]

Then it's configured to detect and wakeup on wrong edge of signal (rising/falling), or if not possible to configure such option you need to modify the hardware.​