17.3.2.1.1 Enabling the FRC

The FRC oscillator is powered in the following conditions:

When OSCCON.NOSC[3:0] = 4’b0000 or a fail-safe clock monitor is enabled and a clock fail is detected, forcing a switch to FRC.
When SPLL_CLK2 of ADC PMU Controller, Flash controller and 32KHz_LPCLK (32 KHz) request it as the source.

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