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

No it's not rocket science, your making it way harder than it is...

IRC_CAL is used to adjust the INTERAL oscillator ONLY. It has no effect if an external anything is used.

IRC_FAST will just set the internal oscillator as fast as it can be adjusted, but not nessaccarly +8%, same with IRC_SLOW.

IRC_CAL uses the SX-Key to measure the internal oscillator and sets it as close as possible to 4Mhz (this could still be several percent off).

The +/- 8% figure means that the interal oscillator can vary upto +/- 8% with supply voltage and temperature.

Bean.

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