ATmega328P datasheet(338/345 Pages) ATMEL

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338

7810A–AVR–11/09

ATmega328P [Preliminary]

36. Table of Contents

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

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

1.1

Pin Descriptions .................................................................................................3

1.2

Disclaimer ..........................................................................................................4

1.3

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

Overview ................................................................................................... 5

2.1

Block Diagram ...................................................................................................5

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

Data Retention .......................................................................................... 7

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

AVR CPU Core .......................................................................................... 8

6.1

Overview ............................................................................................................8

6.2

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

6.3

Status Register ................................................................................................10

6.4

General Purpose Register File ........................................................................11

6.5

Stack Pointer ...................................................................................................12

6.6

Instruction Execution Timing ...........................................................................13

6.7

Reset and Interrupt Handling ...........................................................................14

AVR Memories ........................................................................................ 16

7.1

Overview ..........................................................................................................16

7.2

In-System Reprogrammable Flash Program Memory .....................................16

7.3

SRAM Data Memory ........................................................................................17

7.4

EEPROM Data Memory ..................................................................................18

7.5

I/O Memory ......................................................................................................19

7.6

System Clock and Clock Options ......................................................... 25

8.1

Clock Systems and their Distribution ...............................................................25

8.2

Clock Sources .................................................................................................26

8.3

Low Power Crystal Oscillator ...........................................................................27

8.4

Full Swing Crystal Oscillator ............................................................................29

8.5

Low Frequency Crystal Oscillator ....................................................................31

8.6

Calibrated Internal RC Oscillator .....................................................................32

ATmega328P Datasheet(PDF) 338 Page - ATMEL Corporation

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