I have some questions which I would like to discuss with you.
- Are there any disadvantages when I change the CPU speed from 1Mhz to 4Mhz during runtime? Of course I switch the FreeRtos timing and I'm aware of the delay functions. Beside that, do I have to take anything into account?
- Is it ok, to calibrate the internal Oszillator to 7.3728Mhz to get good usart clocking? From datasheet, I should be able to calibrate from 7.3 to 8.1 Mhz. But what happens if the temperature changes, will I get problems running out of OSCCAL value range during calibration? I know, that the internal oszillator isn't the best for usart communication, but I don't need it all the time, so it is ok I think.