> Harold Hallikainen <harold <at> hallikainen.org> writes:
>
>> I've done an open collector UART based bus with multiple devices.
>> There's
>> a pull-up resistor on the bus. UART RX pins tie directly to the bus.
>
> That works well and is not limited to pics. 8051s also work with such a
> bus. It
> can also be debugged and controlled from a PC. I have also used such a bus
> in
> the past. The only problem is the requirement for a stable clock, which
> excludes
> RC parts. A solution is the Dallas 1-wire bus which is self clocked.
>
> Peter
>

I think the new PICs with internal RC are stable enough for this
application unless you are doing a very wide temperature range.

Harold

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