The processor I that I generally use (AT91SAM7S256) has the option to enable open drain on every IO pin, which is uber-handy for 1 wire. Just use the normal UART but open drain the TX and tie TX/RX together and you lose all the timing overheard by getting the uart to do it all for you!
Sounds like a handy chip, that. I suppose the SA1100 might be able to do something similar, if it wasn't already using all of the internal UARTs for other purposes!
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