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

99% of the time I have had this problem, it was either dirty connections between the SX-Key and the prog. port on my board, or using a long header cable, etc.

My experience has been that with a dirty connection it is always possible to *program* the chip, but not debug (the debug features run at a very high clock rate). In some cases just cleaning pins on my programming port on the board did the trick.

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