Thomas,

 From my experience, you have to toggle the /SS pin at every transaction.
 This is what tell the slave to act upon the data/command it just received.

                                                     Regards,

                                                       Jim



> Hi,
> If a Master PIC wants to send multiple bytes of data
> to a Slave PIC (with SS enabled) using SPI, does it
> have to pull the SS line high at the end of every
> byte?  The slave receives data perfectly with this:
> - SS low
>   - Send data
>   - Delay 10ms
> - SS high
> - SS low
>   - Send data
>   - Delay 10ms
> - SS high
>
> However, The slave doesn't receive data properly with
> this:
> - SS low
>   - Send data
>   - Delay 10ms
>   - Send data
>   - Delay 10ms
> - SS high
>
> Both the slave and the master are F877 @ 20Mhz.  Did I
> do something wrong?
> Regards,
> Thomas
>
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