7.6.1 Clocks Startup
The device selects the OSC16M oscillator which is enabled by default after reset and configured at 4 MHz.
This 4 MHz clock is also the default time base for the Generic Clock
Generator 0 which provides the main clock (CLK_MAIN) to the system through the GLCK_MAIN
clock.
Note: Other generic clocks are
disabled to optimize power consumption.
Some synchronous clocks require also to be active after startup.
Note: These active synchronous clocks also
receive the 4 MHz clock from Generic Clock Generator 0.
Refer to the Clock Mask Register section in the Main Clock (MCLK) chapter to obtain the list of clocks that are running by default.