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ATMEGA8 with 8Mhz crystal just running at 1Mhz

I have a ATMEGA8A-PU with a 8Mhz crystal oscillator (T8.000 is 8Mhz isn't it?) and the following C code: ...
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Highest ADC input signal frequency for atmega8?

I am trying to make a simple project which involves acquiring some data from the adc of atmega8 chip and then sending that data to UART. But I cannot figure out what would be the maximum limit of the ...