In SX Microcontrollers, SX/B Compiler and SX-Key Tool, mgreen wrote:

If you have a block of 3 I/O pins free on each SX28, you can simply hook the 3 I/O pins from one SX28 to the other using a 330 Ohm resistor on each pin.   You'd declare the I/O pins as inputs on one SX28 and as outputs on the other SX28 (where the output register would work like a variable).  You'll need to initialize the I/O pins appropriately by declaring the individual pins as INPUT or OUTPUT.  One example of the declarations is "4 bit Parallel LCD Display with SX28 (SX/B 2.0)" here [url]http://forums.parallax.com/forums/default.aspx?f=7&m=182809[/url].

If you use pins 0-2 of one of the byte I/O ports, you'll have an easier time setting and checking the 3-bit value.  If the port is called Comm, you'd set a new value (NewValue) by using something like:
[code]Temp = Comm & %11111000
Temp = Comm | NewValue
Comm = Temp[/code]
To test the value on the other SX28:
[code]Temp = Comm & %00000111
IF Temp = 3 THEN[/code]

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