> I am stuck and I need your help!  I have 2 PIC16F877 Micros.  They are
> communicating with each other through SPI (One master and one slave).
> The Master sends 2 bytes of data to the Slave - one is the "command"
> byte and one is the "data" byte.  The Master IC always sends out the
> "command" byte first follows by a "data" byte. The Slave IC gets
> interrupted every time the SPI reception is completed.
>
> Here is my question:  How do I write the code so that the Slave knows
> which byte is the "command" byte and which byte is a "data" byte?

You deselect the slave after the data byte, and the slave always
interprets the first byte after select as a command byte.


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