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Can the RTC output be used for PLL0 input?

Question asked by LPCware Support on Mar 31, 2016

Yes, the RTC oscillator can be used as a clock source for PLL0, however, when using PLL0 to drive the USB controller, the RTC cannot be used as the clock source. The reason it cannot be used for driving the USB controller is that an FREF less than 100 kHz will need to be used, and this causes a high jitter, which can cause a problem for PLL0.