On page 17-19 (513) of slau056.pdf (http://focus.ti.com/lit/ug/slau056f/slau056f.pdf) USPIE0 sets USART0 to SPI mode in ME1 register.
msp430xG461x.h does not have a listing for USPIE0 but msp430xG43x.h does (line 91). Line 107 of msp430xG461x.h should have the following: #define USPIE0 (1<<6) John
