Hi John, I wouldn't say a polled TX driver was the intention.Transmission is kicked off by loading a value into the TXBUF. Once this buffer is emptied into the transmit shift register, the TXIFG is set which can trigger an IRQ. Then inside the ISR you would reload a new value into TXBUF. If you want to stop transmission and restart it later, you would have to load a value into TXBUF again. This could be done within an RX ISR for example. I would consider what I've described above to be an IRQ based approach but maybe we're thinking of two separate applications/scenarios. Best regards, Caleb Overbay
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