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

Hi all:

I am trying to set up a 3-wire asynchronous serial communication between an SX52 protoboard and a home-brewed SX28 project.
I made the communication asynchronous since I want it to work seamlessly between SXs running at different clock speeds without having to tweak things by hand every time.

The three wires are ready to send, clear to send, and serial data.

It's almost working but there is some kind of noise on the lines that's getting interpreted as data.

I have diodes on RTS and CTS since each acts as a one-way line on which one device always talks and the other always listens.

Both microcontrollers are powered from the same supply and share a common ground.
They are running at 4MHz off of their internal oscillators.

There seems to be fluctuation and "Floating" of the low voltage off of ground.
When the pins are hot the voltage holds steady.

Should I use pull down resistors?
Capacitors?
Something else?

Thanks,
-Electronegativity

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