(respond before)• ck_spre (usually 1 Hz internal clock)When ck_spre frequency is 1Hz, this allows to achieve a wakeup time from 1 s toaround 36 hours with one-second resolution.I have configured the wakeup Timer with CubeMx:For 3 Seconds:In the main....

@Bruno Sena​ How did you configure the wakeup timer?I am trying it with CUBEMX. -> In the STM32F44_en.DM00135183.pdf under section 22.3.4 "Periodic auto-wakeup"I found:The wakeup timer clock input can be:• RTC clock (RTCCLK) divided by 2, 4, 8, or 16...