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

Dan,

  First you need to know if the chip is running or not, just because your serial pin stays at ground doesn't mean it stopped working. 

  Just make a simple LED blinker with the same DEVICE parameters and see if it works. If it doesn't post the LED blinker program.

  You may need a different OSCxxx setting for 3.3V on the device line.

Bean.

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