Olin
I think this refers to how accurately you detect the start bit, therefore
how accurately you can locate the center of subsequent bits. Testing for
start with even 1 bit time would work sometimes, 1/2 bit time (i.e. polling
for start at twice baud rate) gives 1/2 bit uncertainty, 1/4 is probably a
good compromise. Hardware UARTs frequently use 1/16 bit sampling.

Oliver.

----- Original Message -----
From: Olin Lathrop <olin_piclist@COGNIVIS.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, September 24, 2000 3:46 PM
Subject: Re: [PIC]: Asynchronous comms on PIC 12ce519


> > In case anyone is interested l have found that you synchronise at 1/4
bit
> > time for sampling and leave a 1/2 bit window in which to sample you get
> much
> > better results than trying to sample at 1/2 bit time...
>
> I don't follow what your are trying to say.  If you are going to take a
> single sample per bit, why would you not want to center your sampling
window
> at wherever you think the center of the bit is?
>
>
> *****************************************************************
> Olin Lathrop, embedded systems consultant in Devens Massachusetts
> (978) 772-3129, olin@cognivis.com, http://www.cognivis.com
>
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