Using Xmega USART in Master SPI mode

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I have a question regarding using the USART peripheral as a Master SPI.  The datasheet is not clear (to me) regarding enabling/disabling the TX/RX. 

Does the USART state machines get completely reset when the TX/RX are disabled?  I see that the buffers get flushed but I see nothing

regarding the state machine(s) being reset.  I would assume so but wanted to ask first.  If this is explained better in the datasheet, I would appreciate someone

pointing to where this is explained.