Datasheet

Table 28-5 ADC Prescaler Selections
ADPS[2:0] Division Factor
000 2
001 2
010 4
011 8
100 16
101 32
110 64
111 128
Atmel ATmega64A [DATASHEET]
Atmel-8160E-ATmega64A_Datasheet_Complete-09/2015
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