In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Peter Van der Zee wrote:

Hi All;

I hate to be a spoiler in all of this, but I use the internal oscillator at 4 MHz for serial comms at 9600 frequently, and find it totally reliable provided one is able and prepared to "tune" the software timing to suit.

Additionally, the stability with temperature is adequate.

I normally run things at 50 MHz with a resonator, but for low cost and battery apps the internal 4Mhz works just peachy.

All that said, for critical applications I would go to a resonator, but I have some applications where there just is no room for the leaded part.

Cheers,

Peter (pjv)

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