8.3 Clocks After Reset

The device selects the Main RC oscillator which is enabled by default after reset and configured at 12 MHz.

This 12 MHz clock provides the main clock (MAINCK) to the system.

The Slow RC oscillator is also enabled by default after reset and provides the slow clock (SLOW_CLK) that is a source for peripherals requiring a default slow clock source or reduce wake-up timings.