Hello Amine, In general for MSP430 devices using the (e)USCI modules for I2C, the RXIFG will fire every time the Receive buffer is filled, and the TXIFG will fire every time the Transmit buffer is empty. For debugging your I2C issues, please see the following application note. "Solutions to common eUSCI and USCI serial communication issues on MSP430 MCUs.' ( http://www.ti.com/lit/slaa734 )
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