AVR-Chat

Thanks for the clarification.

At 07:29 PM 5/10/04 -0400, you wrote:
>
>Do you have a link to the thread - I'd be interested in that.

Just got to the Avfreaks.com site and the first forum.
Then do a seach for RS485 in the last 30 days and it
should come up. (I made some silly comments on the
thread not knowing better :-(( )

Basically the 8250 and descendeds 16450 etc have 5 different
parity modes that can be used , NONE, EVEN,ODD these
are the usual but then there is the MARK and SPACE mode
which are basically the 9 bit mode with MARK setting the parity
bit (i.e. the Address mode) and the SPACE clearing it (Data mode).
By just toggling these 3 modes your everyday PC UART can talk
to a 9 bit mode micro. If anyone is interested I can post the Delphi code
I have been using for the past week or so. It's not bullet proof yet but
it works very well.

You can also have a look at the 16550 etc data sheet under parity.



Regards

John Samperi

******************************************************
                        Ampertronics Pty. Ltd.
  11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA
         Tel. (02) 9674-6495       Fax (02) 9674-8745
               Email: samperi@ampertronics.com.au
                 Website  http://www.ampertronics.com.au
* Electronic Design   * Custom Products   * Contract Assembly
******************************************************