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

Kelvin,
  Make sure you power supply is not dipping below 5.0 volts when the SX-Key start up.
  
  If you are using the OSC4MHZ setting on the device line, then serial communication will not work correctly because the internal oscillator is only +/- 8% accurate. It WILL work when debugging because when you are debugging the SX-Key supplies the clock and the SX-Key is very accurate.

Bean.

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