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nRF52840 examples with LFRC and calibration?

I am designing a custom board with a nRF52840 module that has no 32.768 kHz crystal embedded in it and as a first step want to test it with some examples that use only RC LFCLK.

The Blinky example doesn’t have any clock configured in the sdk_config.h (even the section for such configuration is missing), so can I assume that this example uses LFRC as it declared as default source  in the documentation?

Which other examples use LFRC and is there any example with a calibration?

Thanks

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