Thanks to all for your help. I believe I have a resolution.

To cut a long story short, I added all the additional components to no avail. I'd been using my emulator all along, and the TI UART was stopping the first time I tried to set some UART registers up.

Confession time - I'd done a lazy thing.

I had a macro that I used for transmitting data, and the first thing it does is wait for TXRDY to be high - ie, is the FIFO clear. I'd also used this macro to send data to the UART registers, which worked fine on the Philips chip. However, on the TI chip TXRDY is low (active) until the first UART reg has been programmed. Solution? A seperate macro to program the registers that doesn't wait on TXRDY.

Of course, I also need the extra components I think - at least Rp.

Thanks again.