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

Ray,

as far as I know, the DEVICE PROTECT directive does nothing else but clear bit 3 in the FUSE register during programming the chip. This does not cause the data in program memory to be scrambled, i.e. you can run, program, debug the chip as usual. The only difference is when reading the program memory you will get scrambled data. I'm using the DEVICE PROTECT option in many of my commercial applications, and don't have problems RUNning, or DEBUGing them with the SX-Key IDE. But the "Device - Read" and "Device - Verify" options will fail by good reason, reading back junk only.

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