In SX Microcontrollers, SX/B Compiler and SX-Key Tool, thomas1971 wrote:

Another interesting thing Ive just found, After the SX48 is programmed at 5v, if I put the supply back to 3.3, and try to program again it works.!!!.
Seems when the SX48 in new and unprogrammed, it want allow programming at 3 volts. Very strange problem, must be a register or somthing internal to the SX48.

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