rtc compare interrupt and hibernate mode

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Hello, 

I'm working with a SAD51N20 with a custom board. The RTC work with the ultra low power internal oscillator. The rtc is configured to work in mode 0.

I have initialized the rtc and one compare alarm.

Everything work properly in run-mode, idle and stand by.

when the time reach the alarm the interrupt is asserted  i the application is in stand by or idle the application is waked up.

If I put the application in hibernate when the compare value is reached the application reset.

I have read the user manual and it seams that rtc have to work also in hibernate mode 

Can you give me any sudgestion?

Thanks