ATmega324P datasheet(369/377 Pages) ATMEL

369 / 377 page

369

7674F–AVR–09/09

ATmega164P/324P/644P

36. Table of Contents

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

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

Overview ................................................................................................... 3

2.1

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

2.2

Comparison Between ATmega164P, ATmega324P and ATmega644P ...........4

2.3

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

Resources ................................................................................................. 7

About Code Examples ............................................................................. 8

AVR CPU Core .......................................................................................... 9

5.1

Overview ............................................................................................................9

5.2

ALU – Arithmetic Logic Unit .............................................................................10

5.3

Status Register ................................................................................................11

5.4

General Purpose Register File ........................................................................12

5.5

Stack Pointer ...................................................................................................13

5.6

Instruction Execution Timing ...........................................................................14

5.7

Reset and Interrupt Handling ...........................................................................15

AVR Memories ........................................................................................ 18

6.1

Overview ..........................................................................................................18

6.2

In-System Reprogrammable Flash Program Memory .....................................18

6.3

SRAM Data Memory ........................................................................................19

6.4

EEPROM Data Memory ..................................................................................21

6.5

I/O Memory ......................................................................................................22

6.6

System Clock and Clock Options ......................................................... 29

7.1

Clock Systems and their Distribution ...............................................................29

7.2

Clock Sources .................................................................................................30

7.3

Low Power Crystal Oscillator ...........................................................................32

7.4

Full Swing Crystal Oscillator ............................................................................33

7.5

Low Frequency Crystal Oscillator ....................................................................34

7.6

Calibrated Internal RC Oscillator .....................................................................36

7.7

128 kHz Internal Oscillator ..............................................................................37

7.8

External Clock .................................................................................................37

ATmega324P Datasheet(PDF) 369 Page - ATMEL Corporation

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