Lpc2000

Our present product uses the AVRs UART with 9 bit data.

Any insight how this might be accomplished using one of these
parts ?

I'm weighing the different features to Try to decide if I should 
change to one of these parts or not.  They sure look good...

thanks,
bob

At 05:52 PM 5/18/04 +0000, you wrote:
>Our present product uses the AVRs UART with 9 bit data.
>
>Any insight how this might be accomplished using one of these
>parts ?

It should be possible.  I've used 16550's on a PC to do this and the LPC 
serial uarts are essential 16550s.  The trick is to use 8 bits with either 
mark or space parity depending on how you want the ninth bit set.  That 
does mean you are changing parity on the fly but you usually only do that 
at the start (and sometimes end) of a packet.  You do need to make sure 
there are no transmit buffer interactions (you don't want to modify the 
parity of previously buffered data).

On receive the ninth bit can be detected as a parity 
violation.  Potentially the biggest problem is that you can't set up to 
receive only when the ninth bit is set so you must set up your receive 
routines to read everything and discard the irrelevant portions (it does 
make a 'sniffer' easier to write though).  The performance of the LPC 
should be able to compensate for the increased overhead.

Robert

" 'Freedom' has no meaning of itself.  There are always restrictions,
be they legal, genetic, or physical.  If you don't believe me, try to
chew a radio signal. "

                         Kelvin Throop, III