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

Hmmm...

Patient to doctor: "When I press here, it hurts". Doctor to patient: "Then don't press there".

Both situations you describe are irregular: The power supply should not bounce on and off, and it is always a good idea to pull or plug on the SX-Key with the system powered down before.

I don't know the SX internals in detail, so I can explain this effect only on my assumptions: Either does the SX enter into some indifferent state where some high- and low-end output drivers are both on, or - maybe - it operates at a very high clock frequency on some overtone of the attached resonator/xtal.

BTW: I never saw such a latchup here, and I've used over 1000 SXes for my various projects so far.

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