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About I2C

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Hello ahgan84. You'll want to refer to the MSP430x2xx Family User's Guide, slaa144h.pdf. [tipdf]slau144h[/tipdf] 14.1 covers devices with the Universal Serial Interface (USI) and 17.1 covers devices with the Universal Serial Communications Interface (USCI) I2C modes.

Basically, if your device has USI, you won't use UCBxTXBUF at all. And if you have USCI, you won't use USISRL.

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