Hi!

I'm looking at a design for work where we would have one central PIC
playing communications host (probably an 18F452), and 8 "satellite" PICs
controlling hardware (16F818's), communicating via with the host via SPI.

I'm worried, however, about "broadcast messages" to the satellite PICs.
Can the 16F818's listen even if the SS signal is not asserted?  Or can
I assert all of the 16F818's SS lines and have everyone listen?

And, what about the reply to the SPI master?  Do I have to worry about the
"wired-OR" nature of the SDO line, or can I keep a 0 in the SPI transmit
register, and nobody sends a reply?

If the question isn't clear enough, please ask for details.

Thanks,
   Bill

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