peripheral_bus_clock arduino zero

Hi

how long does this command take? This is for a timer interrupt on an arduino zero..

while (TCC_0->SYNCBUSY.bit.CC0 == 1);

I found in the datasheet:

5*period_generic_glock + 2*period_peripheral_bus_clock < delay < 6*period_generic_glock + 3*period_peripheral_bus_clock

But how long is period_peripheral_bus_clock? In the datasheet it says that this clock is generated from the main but has a prescaler. By default this prescaler is 1?

Thanks

Datasheet should tell you the prescalar. For AVR the default serial peripheral inteface bus clock divider is 4.

hmm ok till now I have not found it