6.3.1 Starting of Clocks

After power-up, the device is set to its initial state and kept in reset, until the power has stabilized throughout the device. Once the power has stabilized, the device will use a 4 MHz clock. This clock is derived from the 48 MHz Internal Oscillator (OSC48M), which is configured to provide a 4 MHz clock and used as a clock source for generic clock generator 0. Generic clock generator 0 is the main clock for the Power Manager (PM).

Some synchronous system clocks are active, allowing software execution.

Refer to the Clock Mask Register in the MCLK - Main Clock for the list of default peripheral clocks running. Synchronous system clocks that are running are by default not divided and receive a 4 MHz clock through generic clock generator 0. Other generic clocks are disabled.