ATMEGA640 datasheet(7/436 Pages) MICROCHIP

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

2.2

Comparison Between ATmega1281/2561 and ATmega640/1280/2560

Each device in the ATmega640/1280/1281/2560/2561 family differs only in memory size and number of pins. Table

2-1 summarizes the different configurations for the six devices.

2.3

Pin Descriptions

2.3.1

VCC

Digital supply voltage.

2.3.2

GND

Ground.

2.3.3

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 buf-

fers 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.

Port A also serves the functions of various special features of the ATmega640/1280/1281/2560/2561 as listed on

page 75.

2.3.4

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 buf-

fers 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.

Port B also serves the functions of various special features of the ATmega640/1280/1281/2560/2561 as listed on

page 76.

2.3.5

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 buf-

fers 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 ATmega640/1280/1281/2560/2561 as listed on page 79.

Table 2-1.

Configuration Summary

Device

Flash

EEPROM

RAM

General

Purpose I/O pins

16 bits resolution

PWM channels

Serial

USARTs

ADC

Channels

ATmega640

64KB

4KB

8KB

ATmega1280

128KB

4KB

8KB

ATmega1281

128KB

4KB

8KB

ATmega2560

256KB

4KB

8KB

ATmega2561

256KB

4KB

8KB

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