ATmega3208/3209

18.4 Register Summary - VREF


Offset	Name	Bit Pos.	7	6	5	4	3	2	1	0
0x00	CTRLA	7:0		ADC0REFSEL[2:0]				AC0REFSEL[2:0]
0x01	CTRLB	7:0							ADC0REFEN	AC0REFEN

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