Help needed: Question on Frequency Processing

I am truly lost. I need some help and a redirection. I am trying to make a chromatic tuner using AT89C2051. My project would only be from C1 until B5.

The signal would be from a cable or stereo jack.

I will be using the ADC0848 for the conversion.

I've been reading up on how frequency works but I can't seem to understand a lot of things. If my ADC and MCU are only 8-bits. How would I determine the frequency of the input in the code or inside the MCU?

I'm sorry if this is a very dumb question. I'm not an engineering student or anything.


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