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2561

8-bit Atmel Microcontroller with 16/32/64KB In-System Programmable Flash

Atmel Corporation 

2. Overview

The ATmega640/1280/1281/2560/2561 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced

RISC architecture. By executing powerful instructions in a single clock cycle, the

ATmega640/1280/1281/2560/2561 achieves throughputs approaching 1 MIPS per MHz allowing the system

designer to optimize power consumption versus processing speed.

2.1 Block Diagram

Figure 2-1. Block Diagram

VCC

PF7..0

PK7..0

PJ7..0

PE7..0

RESET

GND

XTAL1

XTAL2

PA7..0

PG5..0

Power

Supervision

POR / BOD &

RESET

Watchdog

Timer

Watchdog

Oscillator

Oscillator

Circuits /

Clock

Generation

PORT A (8)

PORT G (6)

PORT F (8)

PORT K (8)

PORT J (8)

PORT E(8)

JTAG

EEPROM

XRAM

A/D

Converter

Internal

Bandgap reference

CPU

Analog

Comparator

16 bit T/C3

16 bit T/C5

16 bit T/C4

FLASH

SRAM

16 bit T/C1

USART 0

USART 3

USART 1

PC7..0

PORT C (8)

TWI

SPI

8 bit T/C0

8 bit T/C2

USART 2

NOTE:

Shaded parts only available

in the 100-pin version.

Complete functionality for

the ADC,T/C4, and T/C5 only

available in the 100-pin version.

PORT D (8)

PORT B (8)

PORT H (8)

PORT L (8)

PD7..0

PB7..0

PH7..0

PL7..0

The Atmel® AVR® core combines a rich instruction set with 32 general purpose working registers. All the 32 regis-

ters are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in

one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving

throughputs up to ten times faster than conventional CISC microcontrollers.

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

5

2549Q–AVR–02/2014

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