ATMEGA3290 datasheet(6/375 Pages) ATMEL

6 / 375 page

ATmega329/3290/649/6490

2552H–AVR–11/06

Comparison between

ATmega329,

ATmega3290,

ATmega649 and

ATmega6490

The ATmega329, ATmega3290, ATmega649, and ATmega6490 differs only in memory

sizes, pin count and pinout. Table 1 on page 6 summarizes the different configurations

for the four devices.

Pin Descriptions

The following section describes the I/O-pin special functions.

Digital supply voltage.

GND

Ground.

Port A (PA7..PA0)

Port A is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each

bit). The Port A output buffers have symmetrical drive characteristics with both high sink

and source capability. As inputs, Port A pins that are externally pulled low will source

current if the pull-up resistors are activated. The Port A pins are tri-stated when a reset

condition becomes active, even if the clock is not running.

Por t A also ser v es the fu nctio n s of va r i ou s sp ecia l f e a t ur es of t h e

ATmega329/3290/649/6490 as listed on page 67.

Port B (PB7..PB0)

Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each

bit). The Port B output buffers have symmetrical drive characteristics with both high sink

and source capability. As inputs, Port B pins that are externally pulled low will source

current if the pull-up resistors are activated. The Port B pins are tri-stated when a reset

condition becomes active, even if the clock is not running.

Port B has better driving capabilities than the other ports.

Por t B also ser v es the fu nctio n s of va r i ou s sp ecia l f e a t ur es of t h e

ATmega329/3290/649/6490 as listed on page 68.

Port C (PC7..PC0)

Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each

bit). The Port C output buffers have symmetrical drive characteristics with both high sink

and source capability. As inputs, Port C pins that are externally pulled low will source

current if the pull-up resistors are activated. The Port C pins are tri-stated when a reset

condition becomes active, even if the clock is not running.

Port C also serves the functions of special features of the ATmega329/3290/649/6490

as listed on page 71.

Port D (PD7..PD0)

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.

Table 1. Configuration Summary

Device

Flash

EEPROM

RAM

LCD

Segments

General Purpose

I/O Pins

ATmega329

32K bytes

1K bytes

2K bytes

4 x 25

ATmega3290

32K bytes

1K bytes

2K bytes

4 x 40

ATmega649

64K bytes

2K bytes

4K bytes

4 x 25

ATmega6490

64K bytes

2K bytes

4K bytes

4 x 40

ATMEGA3290 Datasheet(PDF) 6 Page - ATMEL Corporation

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