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

Joel,
  You say you do have the 10K between MCLR and the supply, so that is Ok.

  Do you have a bypass cap between Vdd and Vss on the PCB ?

  Also, you say you are using the internal 4mhz clock with an RS-232 application. This is a recipe for disaster. The internal clock is only accurate to +/- 8% and can (will) cause problems.

Bean.

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