Dave VanHorn wrote:

> I've done this on an 84, with ints AT the bitrate.
> The trick is to catch the edge of the start bit, and sync the ints up
> half a bit-time late.

  Yes, but that's the hybrid technique; you still need to poll for the
start bit and synchronize the interrupts.  Only *thereafter* it has low
overhead.

  Fine if you are not using the timer for anything else - such as
timing!

> I wouldn't use this approach in a noisy environment or on long lines.

  Muse:  How many UARTs *actually* do take multiple samples and average
them, and how many just sample in the middle of each bit?

--
  Cheers,
        Paul B.