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

I've seen the same problem, where the SX's don't want to run without the SX-Key attached.

I find that the first few times I program an SX chip it works fine by itself, but after being programmed a dozen times or so, it will only startup properly with the SX-Key attached.  I investigated further and found that the OSC wasn't oscillating.  I tried adding various resistors and caps on the resonator, which might work for a short while, but would eventually have the same problem.  To get reliable startup, I had to restrict my SX usage to applications that could use the internal 4 Mhz oscillator, though very recently I've had one SX-28 that needs the SX-Key to run on the SX Tech board even with the internal 4 Mhz clock.  Previous to this recent incident with the SX-28 on a SX Tech board, all my earlier problems had occurred with SX-48's on custom PCB's or commercial USB modules like the DLP-245SY, and the Elexol USB I/O 24.

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