Part Number: MSP430FR6989 Hello All, I have seen some other threads on this - difficulty/confusion on getting the TX IRQ to trigger for the '6989. I'm using the A1 UART on pins 3.4 and 3.5 - I've noticed the MSP430 Ware also seems to be unreliable for the A1 port; I have to set this up the classic way so to speak to get the port to work. In order to trigger a TX IRQ - I have to first use the RXIRQ - echo the char to TX; then the TX IRQ will work. I have a string queued up that will then transmit provided the echo took place to kick off the TX IRQ. It would appear something has to be written to UCA1TXBUF first for the TXIRQ to become active. I have to wonder if this is the desired behavior of this serial port; if it is - can someone (preferably TI) show the state machine in which a TX IRQ is designed to be entered? Writing one char and then jumping into the TXIRQ doesn't seem to be the desirable behavior but that is the only way thus far I have got this to work. I've included about all I can find on the hardware internal to the chip here: Thanks In Advance, and Happy Holidays! John W.
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