Does the nRF52840 have an internal error flag to detect defect of external LFCLK source?

[Konstantin Y]

Dear Nordic team,

considering our error analysis, does the nRF52840-CKKA-F have an internal error flag that is set when the external LFCLK source is absent or shortcut?

What is the nRF expected to do in case the external LFCLK source fails?

Best gegards,

Konstantin

[Jared]

Hi,

Normally you would wait for the LFXO event EVENTS_LFCLKSTARTED to be generated after starting the LFCLK with the task TASKS_LFCLKSTART. If the LFCLK event doesn't start then the application will usually just spin in the while loop forever. If you suspect that there is something wrong with the external crystal then you can try to change the LFCLK source to the internal RC oscillator and see if it works then. 

regards

Jared 

[Konstantin Y]

Thank you Jared and Torbjørn, this was helpful!