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Hi Peter ! Why don't you try the older MC68B50 ACIA. It is still a good option for the HC11. The chip is obsolete, but you can still find thousands of it almost for free because it was second sourced by many other semiconductor manufacturers like AMI , Fairchild, etc.. You can get 76K and more. The 16550 needs some external extra hardware and I don't think that you will get a surprising result because of the HC11 bandwith limitations compared to a PC microprocessor. Regards, Roberto Guillermo Berner Boolean General 54 11 4308 3500 54 11 4308 3700 ----- Original Message ----- From: "Peter Mackel" <> To: <> Sent: Friday, July 26, 2002 5:20 AM Subject: RE: [m68HC11] PC16550D UART with HC11E1 > Hi > > Has anyone tried connecting a PC16550D UART to a 68HC11E1? I finding it > difficult to fully utilise the higher baud rates that it offers. I can > transmit at 38K, but my time between bytes (where I have to poll the UART to > ensure the previous byte has been sent) practically halves my baud rate. > > I've connected the interrupt line from the UART to the HC11's PortA, and I > use a falling edge on PORT A to trigger my interrupt rountines. > > Just interested if anyone else has used it and if they experienced any > funnies. > > Regards > > Pete > > > To unsubscribe from this group, send an email to:

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