2561 데이터 시트보기 (PDF) - Atmel Corporation
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2561 Datasheet PDF : 435 Pages
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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.
Table 2-1. Configuration Summary
Device
ATmega640
ATmega1280
ATmega1281
ATmega2560
ATmega2561
Flash
64KB
128KB
128KB
256KB
256KB
EEPROM
4KB
4KB
4KB
4KB
4KB
RAM
8KB
8KB
8KB
8KB
8KB
General
Purpose I/O pins
86
86
54
86
54
16 bits resolution
PWM channels
12
12
6
12
6
Serial
USARTs
4
4
2
4
2
ADC
Channels
16
16
8
16
8
2.3 Pin Descriptions
2.3.1 VCC
Digital supply voltage.
2.3.2 GND
Ground.
2.3.3 Port A (PA7..PA0)
2.3.4
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.
Port B (PB7..PB0)
2.3.5
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.
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.
ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]
7
2549Q–AVR–02/2014
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