Samd21 custom board and Arduino framework

It´s works! I can develop the code over the microcontroller.

I dont understand well the crystal setup. I dont know if the microcontroller is running an intertar 32khz crystal and if the microcontroller is working on 1mhz, 8mhz or 48mhz.

If it is possible, i want not work with internar or external 32khz crystal.

Thanks for your help.
Regards,