2.3.17
2.3.18
AVCC
AREF
AVCC is the supply voltage pin for Port F and the A/D Converter. It should be externally con-
nected 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 A/D Converter.
3. Resources
A comprehensive set of development tools and application notes, and datasheets are available
for download on http://www.atmel.com/avr.
4. Data Retention
Reliability Qualification results show that the projected data retention failure rate is much less
than 1 PPM over 20 years at 85°C or 100 years at 25°C.
10
ATmega640/1280/1281/2560/2561
2549LS–AVR–08/07