12.3.6 Timebase
The Timebase is used to generate a timing period that is equal to or longer than 1 µs, used for timing internal delays such as ADC start-up time. This is done by setting the TIMEBASE bitfield in the Timebase (CLKCTRL.TIMEBASE) register to a count of CLK_PER cycles that is equivalent to or larger than 1 µs. The timebase must be rounded up to the closest integer.