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The required USART initialization/re-configuration process is:
1) Set SWRST (BIS.B #SWRST,&UxCTL)
2) Initialize all USART registers with SWRST=1 (including UxCTL)
3) Enable USART module via the MEx SFRs (USPIEx)
4) Clear SWRST via software (BIC.B #SWRST,&UxCTL)
5) Enable interrupts (optional) via the IEx SFRs (URXIEx and/or UTXIEx)
Failure to follow this process may result in unpredictable USART behavior.
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