I have an ATmega8 that I want to run at 3.0V (but 3.3V is ok).
I don't want an external oscillator, only internal oscillator, and I want it running at either 7.3728 MHz or 8MHz. I prefer 7.3728 MHz because it has zero error rate for UART. But 8MHz is ok, as the internal oscillator can only do at best 4MHz or 8MHz.
But on the ATmega datasheet, Figure 171 on page 276, it appears to say that I need at least 5V to get 8MHz.
What would happen if I give it just 3.0V? Would it really just give me ~7.2MHz? Will I get about 7.3728 MHz if I gave it 3.3V?