Andy Kunz wrote:

> At 03:16 PM 1/21/98 +0000, you wrote:
> >Miguel said:
> >> Did someone have a experience as share a memory between 2
> >> microcontrollers in the same circuit?
>
> Rather simple.
>
> Each PIC requests access to the RAM with a handshake pin to the other, and
> an ack line coming back.
>
> If granted access by the other device, that is, the line remains
> deasserted, the requestor is granted access to the device and puts out the
> address selection, then reads/writes data, then releases address (& data),
> the removes its access request.  This can be done for one-byte or a block.
>
> If they have to pass data to one another, you can use the RB0 pin to
> generate an interrupt to let the other know when you are done making your
> update(s).
>
> Andy

Doh! Forgot about that one. The old bus grant/bus ack method.
Simplest of all.

Conor.

PS: You (Andy) sent your mail to me personally instead of the list. As
it seems more On topic than I might have thought I've replied to PICLIST
for the joy of all :-)