Hi Boys.

I am sorry Skimask I did not put a schematic or something but was home, late night.

Darrel, that was exaclty the idea and setup! I may say that except you are reading posts very clearly, I think you read minds too!

Charles, your idea is really the oposite of this. And very dependent on the clock. With the circuit that I would post, but Darrel got me, as always he is one step ahead, there is no critical timing needed.

So the PIC would need a 65 bit buffer to store the 64 bits of the analog values and 1 bit for the previous PISO device. This is not limited to one previous of course. PIC does not know what is before it. It just puts on Sout pin the data of its buffer. The buffer fills from the 8 analog and after that, with the Sin data as arrive on each Clock of the relative pin.

It looks like RS232 serial communication but is not RS232. It is just serial 8 bit data transfer without start-stop bits and sychronous relative to the Clock line.

The point for my difficulty is to shift in PBP the 65 bit buffer.

Ioannis

P.S. Sorry for the long post...