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

See the SX-Key (SX) manual for more details, but the paraphrased version goes something like this:

IRC_FAST or IRC_SLOW  -- this *manually* set calibration fuse bits for the internal clock. Generally these are used because you *don't* want to calibrate the internal clock (which slows downloading).

Using IRC_4MHZ will force the SX IDE to calibrate the clock then download the program. This "calibrated" clock can still be quite off, and is subject to all kinds of fluctuations based on temperature, load, etc. If you have time-critical code then the internal clock may never be accurate enough for you.

That said, being 5%-10% off is one thing, 15% seems pretty high.

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