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

Hi Armored Cars, 

Do you have a resistor between the SX and the display?

If the display can draw more than the absolute maximum current rating of the SX52 then it could burn out the pin

For the SX20/28 the AMR is 45 mA, and the reasonable limit is 30 mA.

I don't know about the SX52, but you might want to look it up in the data sheet.

There is also a maximum total output for all pins, which is 130mA for the SX20/28.

This thread went over a lot of these issues:

 [url]http://forums.parallax.com/forums/default.aspx?f=7&m=86217[url]

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