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

Ray,
  The internal oscillator is not accurate enough for timing such things. SERIN and SEROUT won't work correctly either when using the internal oscillator. It is about +/- 8% so it can vary quite a bit. An even if you use IRC_CAL it it very unreliable.

Bean.

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