ATMEGA640 datasheet(5/436 Pages) MICROCHIP

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

DS40002211A

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 ins t ructions in a single clock cycle, the ATme-

ga640/1280/1281/2560/2561 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

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

CPU

GND

VCC

RESET

Power

Supervision

POR/ BOD &

RESET

Watchdog

Oscillator

Watchdog

Timer

Oscillator

Circuits /

Clock

Generation

XTAL1

XTAL2

PC7..0

PORT C(8)

PA7..0

PORT A (8)

PORT D (8)

PD7..0

PORT B(8)

PB7..0

PORT E(8)

PE7..0

PORT F(8)

PF7..0

PORT J(8)

PJ7..0

PG5..0

PORT G(6)

PORT H (8)

PH7..0

PORT K(8)

PK7..0

PORT L (8)

PL7..0

XRAM

TWI

SPI

EEPROM

JTAG

8 bit T/C0

8 bit T/C2

16 bit T/C1

16 bit T/C3

SRAM

FLASH

16 bit T/C4

16 bit T/C5

USART 2

USART 1

USART 0

Internal

Bandgap reference

Analog

Comparator

A/D

Converter

USART 3

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.

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