32 kHZ controlling softdevice NRF51822

[Matthias]

Hello,

i am using the nrf51822 with softdevice s110. In the spec i read that the contoller works as well with an external 32khz reference which i want to use. The oszillator has a pin for enabling/disabling and another with the clock.

Does the softdevice automatically use the second pin (45 - which now is unused) for enabling and disabling the external reference? If not, can i add this function somehow?

Thanks a lot Matthias

[Asbjørn]

There's nor built in functionality for activating a clock source like you describe, but you can easily configure a GPIO to enable the 32 kHz. The 32 kHz will essentially be running for as long as the softdevice is enabled as it is the protocol timing source. Just make sure that it is running and available before you enable the softdevice.

Also, make sure the clock reference is within the specification for the 32 kHz.