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AVR is a 8- and 32-bit microcontroller core developed by Atmel. AVR was chosen as microcontroller for the first generations of the popular Arduino SBCs.

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Disable RC oscillator in ATmega328 for FCC compliance

With respect to the topic below, I was trying to find where in the AVR documentation does it say the 8 MHz RC internal oscillator is "disabled" when CKSEL is selected to a different source? … FCC Low Oscilation Specifically, if CKSEL only changes the MUX input (figure 6 of atmega328 datashset), but the 8 MHz interncal oscillator is still going (just not being used) then any AVR chip in that …
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Disable RC oscillator in ATmega328 for FCC compliance

Confirmed via email confirmation with Microchip support. When the external clock source is selected (such as for using a 1MHz crystal) by CKSEL, the internal RC oscillator is disabled.
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Disable RC oscillator in ATmega328 for FCC compliance

Still going to wait for official word from Microchip, but @Andrew Macrae pointed me down the right road. It seems that the EEPROM status bits (EECR) are controlled by the calibrated internal RC oscill …
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