37.6.2.2.2 Data Transmission Mode

In Transmitter mode, the TXDATA register contains the data to be transmitted.

when TXDATA is empty, the Transmit Ready bit in the Interrupt Flag Status and Clear register is set (INTFLAG.TXRDYm). Writing to TXDATA will clear this bit.

A transmit underrun condition occurs if data present in TXDATA is sent and no new data is written to TXDATA register before the next time slot. Then, the Transmit Underrun bit in INTFLAG will be set (INTFLAG.TXURm). This interrupt can be cleared by writing a '1' to it. The Transmit Data when Underrun bit in the Tx Serializer Control register (TXCTRL.TXSAME) configures whether a zero data word is transmitted in case of underrun (TXCTRL.TXSAME=0), or the previous data word for the current transmit slot number is transmitted again (TXCTRL.TXSAME=1).