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

I think I figured this out.

I had an SX20 get so hot over the weekend that it desoldered itself from my prototype board!

I believe this occurs when the chip is clocked both internally and externally by the SX key.

This can happen if you have a program running on an internal clock and then plug in the SX key without first turning off the power.

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