Hi Mike,

I used the onboard uart for the PC side and bit-banged the car side.
Remember it is a shared bidirectional bus, not RS-232, with unusual
start/stop characteristics that would make the uart impractical
anyway.

Cheers,

Bob

On 23 Jul 2002 at 10:44, Michael A. Powers wrote:

> Hi,
>
> I've been thinking about interfacing a PIC to my car's ISO 9141 bus.  ISO 9141 functions very similar to a three line RS-232 serial port, at about 10400 baud.  Is there a PIC with an onboard UART that can handle that data rate?  I've read in other places that the maximum rate is about 1200
baud, (when the clock is at 4MHz) which seems outrageously slow to me.  If I can't use an onboard UART, I guess I'll try to use a 16550 external UART to get an appropriate data rate.
>
>
> BTW, are there any PICs with 2 onboard UARTS, for RS-232?  I didn't find any on Microchip's web.
>
> Thanks,
> -Mike
>
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>

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