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

Joe,
  I have not tried it at 3.3volts, but the watchdog timer is VERY inaccurate. And very sensitive to temperature and supply voltage. (In fact I've seen programs that measure temperature using the watchdog timer compared to a resonator).

  50% error sounds really high though.

Bean.

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