Re: Slightly unmatched UART frequencies

On Tue, 25 Nov 2003 06:36:03 +0200, "valentin tihomirov"
<[EMAIL PROTECTED]> wrote:

>UART is used to transfer a byte in serial form bit-by-bit. I know that 10%
>deriviations in frequencies of transmitter and receiver are permissible. I
>was learnt that UARTs synchronyze at the falling edge (1to0) of start bit;
>hence, there should allow for transfer of a stream of bytes of arbitrary
>length.

ITU-T Recommendation V.110 (a.k.a. I.463) explains how to do
synchronous to asynchronous conversion (to get async serial signals
across ISDN).  This includes things like stop bit shaving.

http://www.itu.int/rec/recommendation.asp?type=items&lang=e&parent=T-REC-V.110-200002-I

Regards,
Allan.