In UM chapter 4.6.1 is mentioned that Brown Out Detect (BOD) type of reset can be detected.
But it is not so clear if something should be enabled beforehand.
I have plan to keep MCU in Power-down mode and expect if voltage go to low ( but not 0) and return back, reset is happens and via reset reason will be clear that case.
It would be nice to have BoD as wakeup source from Power-Down mode of MCU but it is not possible.
But how to configure MCU for detect BoD type of reset.