>Isn't it possible to connect the ADC input pin temporary to Vref, or connect a
>free ADC pin to Vref? This would provide you the maximum ADC reading.
>
>You made me have a few more ideas :-)
The absence of an ADRESH register is proof that the ADC can only have 8 bits.
At runtime, I could think of...
To distignuish between 10 and 12 bits, one could set the output to left
justify, and take a hundred readings of a non-constant voltage. If for all the
readings (ADRESL & 0b00111111) == 0, you can be sure the conversion is 10 bits
and not 12. (Due to (quantization) noise, the least significant bit will not be
0 for all of the conversions.)
Or, you can time a conversion: 10 bit takes 11Tad, 12 bit takes 13Tad.
The ADRESH:ADRESL registers are labeled read/writeable, maybe one can write all
1's to the registers, do a conversion of a voltage higher than 1/2 ref., and
see which of the upper bits have been cleared.
Greets,
Kiste
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