Datasheet

6
2593OS–AVR–02/12
ATmega644
2.2.10 AVCC
AVCC is the supply voltage pin for Port F and the Analog-to-digital Converter. It should be exter-
nally connected to V
CC
, even if the ADC is not used. If the ADC is used, it should be connected
to V
CC
through a low-pass filter.
2.2.11 AREF
This is the analog reference pin for the Analog-to-digital Converter.