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

Blackbird,
  I don't see any caps on your regulator. That may be causing the problem. A new chip will not oscillate (I don't think they do), but once programmed it will be oscilating and may be causing noise on the supply.

  Check the schematic on the regulator you are using, they will recommend a cap on the input and output of the regulator.

Bean.

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