Wake-up from deep sleep in absence of LFCLK

[Arash-Spec]

Hi, 

I am using an external RCT module to provide 32.768kHz square wave for the nRF52832 instead of an external crystal oscillator. When the system goes to deep sleep mode, the RTC module mode changes to timekeeping mode and the output clock is turned OFF.

I would like to know whether it is possible to wake up the nRF52832 module when an external trigger event (push button connected to nRF52832 GPIO) occurs but in absence of LFCLK from RTC module? 

The idea is to wake up the nRF52832 module using a push button and then it should trigger the external RTC (External Event Input pin) to provide the 32.768kHz clock.

Thanks.

[Einar Thorsrud]

Hi,

You can use a GPIO input in sense mode to wake up from system off (deep sleep). See this post for details.