ATMEGA64A(2009) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA64A
(Rev.:2009)

8-bit Microcontroller with 64K Bytes In-System Programmable Flash

Atmel Corporation 

ATmega64A

2. Overview

The ATmega64A 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 ATmega64A achieves

throughputs approaching 1 MIPS per MHz, allowing the system designer to optimize power con-

sumption versus processing speed.

2.1 Block Diagram

Figure 2-1. Block Diagram

PF0 - PF7

VCC

GND

AVCC

PORTF DRIVERS

DATA REGISTER

PORTF

DATA DIR.

REG. PORTF

PA0 - PA7

PORTA DRIVERS

DATA REGISTER

PORTA

DATA DIR.

REG. PORTA

PC0 - PC7

PORTC DRIVERS

DATA REGISTER

PORTC

DATA DIR.

REG. PORTC

8-BIT DATA BUS

AREF

PEN

JTAG TAP

ON-CHIP DEBUG

BOUNDARY-

SCAN

PROGRAMMING

LOGIC

ADC

PROGRAM

COUNTER

PROGRAM

FLASH

INSTRUCTION

REGISTER

INSTRUCTION

DECODER

CONTROL

LINES

USART0

STACK

POINTER

SRAM

GENERAL

PURPOSE

REGISTERS

X

Y

Z

ALU

STATUS

REGISTER

INTERNAL

OSCILLATOR

WATCHDOG

TIMER

MCU CONTROL

REGISTER

TIMER/

COUNTERS

INTERRUPT

UNIT

EEPROM

CALIB. OSC

OSCILLATOR

OSCILLATOR

TIMING AND

CONTROL

SPI

USART1

2-WIRE SERIAL

INTERFACE

XTAL1

XTAL2

RESET

DATA REGISTER

PORTE

DATA DIR.

REG. PORTE

PORTE DRIVERS

DATA REGISTER

PORTB

DATA DIR.

REG. PORTB

PORTB DRIVERS

DATA REGISTER

PORTD

DATA DIR.

REG. PORTD

PORTD DRIVERS

DATA REG. DATA DIR.

PORTG REG. PORTG

PORTG DRIVERS

8160C–AVR–07/09

PE0 - PE7

PB0 - PB7

PD0 - PD7

PG0 - PG4

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 con-

ventional CISC microcontrollers.

The ATmega64A provides the following features: 64K bytes of In-System Programmable Flash

with Read-While-Write capabilities, 2K bytes EEPROM, 4K bytes SRAM, 53 general purpose I/O

3

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