Hi guys,
I hope someone can help me.
I am using a MKR1010 board with a SAMD21 and I am trying to change the frequency for the attachInterrupt function to use the external interrupt. I have a receiver on a pin and the external interrupt function is called via attachInterrupt(pin, ISR, CHANGE) to find a valid signal. I think that I need to change the frequency of the EIC (External Interrupt Controller). The SAMD21 uses 48MHz and I would need 16Mhz for the external interrupts. How can I change the frequency? I have no experience in changing the registers 
Kind Regards
Alex