> -----Original Message-----
> From: Alan B. Pearce [SMTP:A.B.Pearce@RL.AC.UK]
> Sent: Wednesday, June 04, 2003 10:44 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [EE]: Zilog Encore series microprocessors
>
> I am aware that many moons ago there were hardware uart chips that did
> sample on absolutely every baud rate clock pulse, but what do you really
> do
> with all this data? Any sort of majority logic is just as likely to make a
> wrong decision as a right decision if there is that much noise. If it is a
> noisy environment then maybe the transmission medium needs changing for
> something less affected (differential, optical etc).
>
All hardware UARTs that I am aware of sample multiple times through the bit
with a majority decision.  The line wouldn't have to be particularly noisy
for a single point sample strategy to fail, just one glitch in the wrong
place would produce an error.  Of course, you have to weigh up what the
application is, there must be thousands of simple bit bashed UARTS working
happily all over the world.

Mike


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