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AVR ADC prescaler and ADC clock frequency.

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ArdyNT

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1. What is the function of ADC prescalar ? Why I need to use prescalar?

2. If I use 12MHz crystal and I choose prescalar of 16, then the clock frequency will be 750 000 Hz. But the datasheet says the frequency should be between 50 kHz - 200kHz. Any explanation about this?

3. If I use codevision, why the clock frequency is 750 000 kHz ? not in Hz like in question 1?

It is shown below:
fr.png
 

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