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F28034有内部时钟的。
6.6.1 Internal Zero Pin Oscillators
The F2803x devices contain two independent internal zero pin oscillators. By default both oscillators are
turned on at power up, and internal oscillator 1 is the default clock source at this time. For power savings,
unused oscillators may be powered down by the user. The center frequency of these oscillators is
determined by their respective oscillator trim registers, written to in the calibration routine as part of the
boot ROM execution. See Section 5, Electrical Specifications, for more information on these oscillators.
