Bob Drzyzgula wrote:
>
> I haven't used one, but the Dallas DS2404 seems as
> if it would be fairly simple to use. It needs
> an external battery and a 32,768 Hz crystal.
> It can be accessed either by the Dallas 1-wire or
> 3-wire protocols.


Those 1 wire protocols are cheap on pins, but expensive on uP time.
70uS delays. There's no good way to do them other than to just hang
around..