How to forward the Clock Signal / Clock Pins ?

[schnitzlein]

Hello,

Using nrf9131-ek because the nrf9161 doesn't seems to have the capability of using an external RC oscillator.

Plans are there in the project with using some/many of the nrf9131 chips together with the same clock.

On a custom pcb, it might be wise in just routeing the external RC oscillator with the same length of routes to each of the pcb.

But I am on a prototype situation right now, before such things...

I have a noob question unfortunately.

I am not sure if it makes sense todo it at all, but actually, I want to forward the Clock Signal outside to one of the Standard Pins the GPIO for example.

For use with ossziloskop and logic analyzer etc. or just provide it as a Signal source to another board.

I checked many options send Clock Signal out via Software APIs, but it will definitly change the clock signal and add some drift/jitter/skew to it.

Is gpio-forwarder an option? never used it before, looks like it is mentioned to be used between nrf cpus.

Can I simply forward the XL1 Pin and XL2 Pin to a random GPIO Pin P0.17 for example. ?
But how ?

XC1 and XC2 is also there but it seems it can only forward this with the same GND forwarding (but if forwarding why not this also)

tl;dr:
Move Clock Signal from external RC oscillator out, how todo?

kind regards

[Turbo J]

Not possible nor intended on any NRFxy µC.

The HFXOs are optimized for crazy short starup time (<2ms for the NRF91XXX) and only support specific crystals AFAIK. Touching them with an oscilloscope probe will probably disturb the circuitry enough for it to stop working correctly.

What are you trying to achieve? There is probably a better way to sync your devices good enough.

[schnitzlein]

thanks for the point, I was worriny about those things too.
I simply have to "make sure" something and check and proof things.

Anyway there are other ways, but I have to follow every single trace I have. :)