My mind is resting on SPI.

I'll try something similar, with clk, data and two chip
select.
The master will send a clk to the chip selected. The slave will respond
with 8 bit of data ( or more ) on any rising or falling clock edge. On the
same bus only selected chip will answer. For small distances up to 2.5...3
meters no level converters are required if twisted wires are used (
clk/gnd, data/gnd, cs/gnd )

best, Vasile

P.S. From the tea rebellion at Boston, half of the world is speacking a
different english... so spelling correctly is like Einstein relativity
theorem...



On Tue, 19 Mar 2002, T Vavouras wrote:

> I have two 16F84 ('slaves') each reading an 8button keypad.
 I configure portb of each PIC to read the input.
I need to send the 8bit input state to a 'master' (probably a 16F877)
once there is a change (a button is pressed or released).
 Can i do it just using an RX and a TX line? how?
 if not possible, what else do you suggest?
> many thanks
>
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