Hi Richard. In an application like yours I did exactly the same, one pin was a "chip select" pin that was controlled by the master MSP430. Whenever it was driven high, I reseted the USCI module by setting the UCSWRST bit. When the master pulled chip select low, the USCI module was activated again by clearing the bit. I never had any problems, the state machine was reset every time. But I did not use STE, I used a GPIO pin with interrupt. Inside the interrupt I configured the USCI module. Dennis
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