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