11.4.1 Initialization
After a Reset, the default clock source for the GCLK_MAIN clock is started and calibrated before the CPU starts running. The GCLK_MAIN clock is selected as the main clock without any prescaler division.
After a Reset, the default clock source for the GCLK_MAIN clock is started and calibrated before the CPU starts running. The GCLK_MAIN clock is selected as the main clock without any prescaler division.
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