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ATMEGA329/V_06

8-bit Microcontroller with In-System Programmable Flash

Atmel Corporation 

Overview

The ATmega329/3290/649/6490 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architec-

ture. By executing powerful instructions in a single clock cycle, the ATmega329/3290/649/6490 achieves throughputs

approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.

Block Diagram

Figure 3. Block Diagram

GND

VCC

AVCC

AGND

AREF

PF0 - PF7

PA0 - PA7

PC0 - PC7

PORTF DRIVERS

DATA REGISTER

PORTF

DATA DIR.

REG. PORTF

PORTA DRIVERS

PORTC DRIVERS

DATA REGISTER

PORTA

DATA DIR.

REG. PORTA

DATA REGISTER

PORTC

8-BIT DATA BUS

DATA DIR.

REG. PORTC

ADC

JTAG TAP

PROGRAM

COUNTER

STACK

POINTER

ON-CHIP DEBUG

BOUNDARY-

SCAN

PROGRAMMING

LOGIC

PROGRAM

FLASH

INSTRUCTION

REGISTER

INSTRUCTION

DECODER

CONTROL

LINES

SRAM

GENERAL

PURPOSE

REGISTERS

X

Y

Z

ALU

AVR CPU

STATUS

REGISTER

USART

UNIVERSAL

SERIAL INTERFACE

INTERNAL

OSCILLATOR

WATCHDOG

TIMER

MCU CONTROL

REGISTER

TIMER/

COUNTERS

INTERRUPT

UNIT

EEPROM

CALIB. OSC

OSCILLATOR

TIMING AND

CONTROL

LCD

CONTROLLER/

DRIVER

SPI

DATA REGISTER

PORTE

DATA DIR.

REG. PORTE

DATA REGISTER

PORTB

DATA DIR.

REG. PORTB

DATA REGISTER

PORTD

DATA DIR.

REG. PORTD

DATA REG. DATA DIR.

PORTG REG. PORTG

PORTE DRIVERS

PORTB DRIVERS

PORTD DRIVERS

PORTG DRIVERS

PE0 - PE7

PB0 - PB7

PD0 - PD7

PG0 - PG4

4 ATmega329/3290/649/6490

2552HS–AVR–11/06

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