ATmega16/32/64/M1/C1
Depending on the clock selection fuse settings, PE1 can be used as input to the inverting Oscil-
lator amplifier and input to the internal clock operating circuit.
Depending on the clock selection fuse settings, PE2 can be used as output from the inverting
Oscillator amplifier.
The various special features of Port E are elaborated in
“Alternate Functions of Port E” on page
78
and
“Clock Systems and their Distribution” on page 29.
2.3.7
AVCC
AVCC is the supply voltage pin for the A/D Converter, D/A Converter, Current source. It should
be externally connected to V
CC
, even if the ADC, DAC are not used. If the ADC is used, it should
be connected to V
CC
through a low-pass filter (see
Section 18.6.2 “Analog Noise Canceling
Techniques” on page 238).
2.3.8
AREF
This is the analog reference pin for the A/D Converter.
2.4
About Code Examples
This documentation contains simple code examples that briefly show how to use various parts of
the device. These code examples assume that the part specific header file is included before
compilation. Be aware that not all C compiler vendors include bit definitions in the header files
and interrupt handling in C is compiler dependent. Please confirm with the C compiler documen-
tation for more details.
11
7647F–AVR–04/09
ATMEL [ ATMEL CORPORATION ]
