ATmega88 datasheet(333/340 Pages) ATMEL

333 / 340 page

333

7530H–AVR–02/09

ATmega48/88/168 Automotive

37. Table of Contents

Features ..................................................................................................... 1

Pin Configurations ................................................................................... 2

1.1

Disclaimer ..........................................................................................................2

Overview ................................................................................................... 2

2.1

Block Diagram ...................................................................................................3

2.2

Automotive Quality Grade .................................................................................4

2.3

Comparison Between ATmega48, ATmega88, and ATmega168 .....................5

2.4

Pin Descriptions .................................................................................................5

About Code Examples ............................................................................. 7

AVR CPU Core .......................................................................................... 7

4.1

Introduction ........................................................................................................7

4.2

Architectural Overview .......................................................................................7

4.3

ALU – Arithmetic Logic Unit ...............................................................................9

4.4

Status Register ..................................................................................................9

4.5

General Purpose Register File ........................................................................10

4.6

Stack Pointer ...................................................................................................11

4.7

Instruction Execution Timing ...........................................................................12

4.8

Reset and Interrupt Handling ...........................................................................12

AVR ATmega48/88/168 Memories ........................................................ 14

5.1

In-System Reprogrammable Flash Program Memory .....................................14

5.2

SRAM Data Memory ........................................................................................16

5.3

EEPROM Data Memory ..................................................................................17

5.4

I/O Memory ......................................................................................................23

System Clock and Clock Options ......................................................... 24

6.1

Clock Systems and their Distribution ...............................................................24

6.2

Clock Sources .................................................................................................25

6.3

Low Power Crystal Oscillator ...........................................................................26

6.4

Full Swing Crystal Oscillator ............................................................................28

6.5

Low Frequency Crystal Oscillator ....................................................................30

6.6

Calibrated Internal RC Oscillator .....................................................................30

6.7

128 kHz Internal Oscillator ..............................................................................32

6.8

External Clock .................................................................................................32

ATmega88 Datasheet(PDF) 333 Page - ATMEL Corporation

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