Is it OK to use the internal LFCLK clock source for SD?

[loste]

Seems like SD will use RTC0, so if I use the "Synthesized from HFCLK" as a clock source, the SD will work well?

[Håkon Alseth]

Hi,

The LFCLK source's job is to give a clock source to peripherals RTC0 and RTC1. You can safely choose the internal RC oscillator, and still use RTC1 in your application. RTC0 will always be used by the softdevice, even if the LFCLK source is changed.

Note that the RTC1 peripheral is normally used by app_timer, so it's easier to create an instance in this library compared to using the RTC1 peripheral directly. If you search around on this forum or look at the BLE-prefixed examples in the SDK, you can see how to setup an app_timer instance.

Cheers, Håkon

[loste]

thank you for your answer.