Datasheet

6
8011GS–AVR–08/07
ATmega164P/324P/644P
2.3.9 XTAL2
Output from the inverting Oscillator amplifier.
2.3.10 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.
2.3.11 AREF
This is the analog reference pin for the Analog-to-digital Converter.
3. Resources
A comprehensive set of development tools, application notes and datasheetsare 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.