Thank you for the answer! In the datasheet I couldn't find out exactly what is UCLK (I hoped that is ACLK). :) I am using wake from RTC and LPM3 mode. The MCU is clocked from an external 32.768 kHz oscillator. Actionly there is some strange behaviour that even when I set the system to LPM4, rtc is still working. Only when I disable the global interrupt than the rtc won't interrupt.
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