> Hi,
>
>     It you use a bitbang software UART you can measure the start bit
> duration and use it as a reference for other bit's position. That way
> you can compensate for variations on the clock caused by temperature
> changes. The temperature changes are usually not too fast. With the
> hardware uart you better use a resonator...

You can only measure the length of the startbit if you know
that the first bit (D0) in the transmitted data is a one, which
has the opposite level of the startbit.

Sending the value 0 with 8 databits, no parity would give you a
single pulse that is 9 bits long.

Ruben


==============================
Ruben Jvnsson
AB Liros Electronic
Box 9124, 200 39 Malmv, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
ruben@pp.sbbs.se
==============================

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