ATmega128 datasheet(379/386 Pages) ATMEL

Part #	ATmega128

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

PDF	386 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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379 / 386 page

2467S–AVR–07/09

ATmega128

Table of

Contents

Features 1

Pin Configurations 2

Overview 2

Block Diagram 3

ATmega103 and ATmega128 Compatibility 4

Pin Descriptions 5

Resources 8

Data Retention 8

About Code Examples 9

AVR CPU Core 10

Introduction 10

Architectural Overview 10

ALU – Arithmetic Logic Unit 11

Status Register 11

General Purpose Register File 12

Stack Pointer 14

Instruction Execution Timing 14

Reset and Interrupt Handling 15

AVR ATmega128 Memories 18

In-System Reprogrammable Flash Program Memory 18

SRAM Data Memory 19

EEPROM Data Memory 21

I/O Memory 26

External Memory Interface 26

System Clock and Clock Options 36

Clock Systems and their Distribution 36

Clock Sources 37

Default Clock Source 38

Crystal Oscillator 39

Low-frequency Crystal Oscillator 40

External RC Oscillator 40

Calibrated Internal RC Oscillator 42

External Clock 43

Timer/Counter Oscillator 44

Power Management and Sleep Modes 45

Idle Mode 46

ADC Noise Reduction Mode 46

ATmega128 Datasheet(PDF) 379 Page - ATMEL Corporation

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