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Специально залез,
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It should be noted that
the X1/XCLKIN pin is referenced to the 1.8-V (or 1.9-V) core
digital power supply (VDD), rather than the 3.3-V I/O supply
(VDDIO). A clamping diode may be used to clamp a buffered
clock signal to ensure that the logic-high level does not
exceed VDD (1.8 V or 1.9 V) or a 1.8-V oscillator may be used.
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Внешний генератор конечно дешевле (как в eZ dsp) но кварц дешевле.
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