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

Hi Electronegativity,

well, I never tried this (and better don't). It only happende to me once in a while that I plugged in the Key in reverse, i.e. OSC1 to Vss, OSC2 to Vdd, Vdd to OSC2, and Vss to OSC1 which did not kill it. Nevertheless, I also have one SX-Key here that does no longer debug, or clock a device. Maybe, I handled it the way you had mentioned without noticing it.

In general, a good rule, handling this little, but valuable device is:

- Always turn off power before connecting, or disconnecting the SX-Key to/from the target device.
- Double-check the right orientation, and position of the SX-Key on the ISP-header before powering the target device.

I also always use a short ribbon cable with a male SUB-D9 on one end, and a female one on the other end sitting between the SX-Key, and the serial cable going to the PC's COM port. This reliefes a lot mechanical stress from the SX-Key.

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