ATMEGA103(1999) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA103
(Rev.:1999)

8-bit Microcontroller with 64K/128K Bytes In-System Programmable Flash

Atmel Corporation 

Block Diagram

Figure 1. The ATmega603/103 Block Diagram

ATmega603/103

VCC

GND

AVCC

AGND

AREF

PORTF BUFFERS

ANALOG MUX

ADC

PORTA DRIVER/BUFFERS

PORTC DRIVERS

DATA REGISTER

PORTA

DATA DIR.

REG. PORTA

DATA REGISTER

PORTC

8-BIT DATA BUS

PROGRAM

COUNTER

PROGRAM

FLASH

INSTRUCTION

REGISTER

INSTRUCTION

DECODER

CONTROL

LINES

STACK

POINTER

SRAM

GENERAL

PURPOSE

REGISTERS

X

Y

Z

ALU

STATUS

REGISTER

SPI

INTERNAL

OSCILLATOR

WATCHDOG

TIMER

MCU CONTROL

REGISTER

TIMER/

COUNTERS

INTERRUPT

UNIT

EEPROM

PROGRAMMING

LOGIC

UART

OSCILLATOR

OSCILLATOR

TIMING AND

CONTROL

XTAL1

XTAL1

TOSC2

TOSC1

RESET

ALE

WR

RD

PEN

DATA REGISTER

PORTE

DATA DIR.

REG. PORTE

PORTE DRIVER/BUFFERS

DATA REGISTER

PORTB

DATA DIR.

REG. PORTB

PORTB DRIVER/BUFFERS

DATA REGISTER

PORTD

DATA DIR.

REG. PORTD

PORTD DRIVER/BUFFERS

PE0 PE7

PB0 PB7

PD0 PD7

VCC

GND

3

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