Re: Atmega Internal clock source accuracy


> I find that Atmega internal 1MHz RC clock source is inaccurate. It is
> about 95% of 1MHz. I used 3V.

The internal RC source varies across V and T.

> I have tried to check the oscillator calibration byte by AVRStudio and
> then load the value into OSCCAL in the beginning of the program.

You don't need to do this for the 1MHz value (usually, it depends on
the specific chip). The 1MHz cal byte is loaded automatically at
powerup.

.

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