ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 4

• Manufacturer Part Number: ATmega88PA Automotive
• Manufacturer: Atmel Corporation

1.1.6
1.1.7
1.1.8
1.1.9
4
Atmel ATmega48PA/88PA/168PA [Preliminary]
Port D (PD7:0)
AV
AREF
ADC7:6 (TQFP and QFN Package Only)
CC
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit).
The Port D output buffers have symmetrical drive characteristics with both high sink and
source capability. As inputs, Port D pins that are externally pulled low will source current if the
pull-up resistors are activated. The Port D pins are tri-stated when a reset condition becomes
active, even if the clock is not running.
The various special features of Port D are elaborated in
page
AV
nally connected to V
to V
AREF is the analog reference pin for the A/D Converter.
In the TQFP and QFN package, ADC7:6 serve as analog inputs to the A/D converter. These
pins are powered from the analog supply and serve as 10-bit ADC channels.
CC
CC
88.
is the supply voltage pin for the A/D Converter, PC3:0, and ADC7:6. It should be exter-
through a low-pass filter. Note that PC6...4 use digital supply voltage, V
CC
, even if the ADC is not used. If the ADC is used, it should be connected
“Alternate Functions of Port D” on
CC
9223B–AVR–09/11
.