If data is written into UCxTXBUF while the master is held inactive by UCxSTE, it will be transmitted as
soon as UCxSTE transitions to the master-active state. If an active transfer is aborted by UCxSTE
transitioning to the master-inactive state, the data must be re-written into UCxTXBUF to be transferred
when UCxSTE transitions back to the master-active state. The UCxSTE input signal is not used in 3-pin master mode.
这是手册上的原话，最后一句说3线不用UCxCTE,难道我理解的不对吗·····
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