RTC Wake up

RE: RTC Wake up

Jørgen Holmefjord — Thu, 23 Apr 2020 10:12:28 GMT

You can use the internal RTC for wakeup only from System ON mode, in system OFF mode all clock sources are stopped. Note that the RTC (Real Time Counter) peripheral is only a low-power/low-frequency timer, it is not a Real Time Clock. You can configure it to generate an event every hour for waking the chip.

RE: RTC Wake up

bhakti — Thu, 23 Apr 2020 10:10:12 GMT

Also please share information documents or link related to internal rtc.

Thank you.

RE: RTC Wake up

bhakti — Thu, 23 Apr 2020 10:08:30 GMT

Thank you for the answer. Also can we use internal RTC alarms for wake up? Does internal RTC of nrf52840 have 1hr alarm register?

RE: RTC Wake up

Jørgen Holmefjord — Tue, 21 Apr 2020 13:02:05 GMT

Hi,

It is possible to wake the nRF52840 from both System ON and System OFF idle modes using GPIO input.

For System ON, see the Pin Change Interrupt Example, for System OFF, you can reference the code in this example on GitHub.

Best regards,
Jørgen