3.3.2 ADC Reference Selection

The reference selection for the ATtiny817 ADC is shown in the table below. It can be configured in the ADMUX register of the ADC.

Table 3-5. ADC Reference Selection
Value	Description
0x0	Internal reference
0x1	VDD
Other	Reserved.

As the core idea is to let V_CC act as the reference of the ADC, the VDD is selected as the ADC reference in this example.

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