Hi Chennangan, If I'm understanding correctly, you're wanting to know how to reset I2caRegs.I2CFFTX.bit.TXFFST to zero when a NACK is received? Is that correct? The I2caRegs.I2CFFTX.bit.TXFFRST register bit will "Reset the transmit FIFO pointer to 0000 and hold the transmit FIFO in the reset state". You will need to create a routine in your application code for handling NACKs. Best, Kevin
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