The TRMT flag tells you that the whole byte has actually been sent on
    the wire.  Most of the time you don't care, but it can be important to
    know if the wire is being shared.

You also want to wait for TRMT before you do something like change the
uart bit rate, if circumstances are such that something can request a
bitrate change while tranmission is in progress (usually this shows up
in larger systems...)

BillW

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