Source of HFCLK

RE: Source of HFCLK

Bendik Heiskel — Tue, 07 Dec 2021 11:30:20 GMT

Yes, the Bluetooth LE Controller will use the external oscillator as the accuracy is needed for the radio.

RE: Source of HFCLK

Christoffer Brask — Tue, 07 Dec 2021 10:14:56 GMT

Hi Bendik,

From what i'm reading, as i'm using BLE, some lowlevel library code will select the use of an external oscillator instead of the internal rc?

RE: Source of HFCLK

Bendik Heiskel — Tue, 07 Dec 2021 10:08:14 GMT

Hi,

The external crystal oscillator is used when a higher accuracy clock is needed. In order to lower the power usage the crystal oscillator is only running when needed, and otherwise the RC oscillator is used. If you don't care about the current consumption and always want the external crystal oscillator running, you can start the crystal oscillator at startup and leave it running. The Clock Driver API can be used for this.

Best regards,

Bendik