ATmega328P datasheet(441/448 Pages) ATMEL

441 / 448 page

8161D–AVR–10/09

ATmega48PA/88PA/168PA/328P

Table of Contents

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

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

1.1Pin Descriptions ........................................................................................................3

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

2.1Block Diagram ...........................................................................................................5

2.2Comparison Between ATmega48PA, ATmega88PA, ATmega168PA and

ATmega328P 6

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

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

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

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

6.1Overview ................................................................................................................... 8

6.2ALU – Arithmetic Logic Unit ......................................................................................9

6.3Status Register ..........................................................................................................9

6.4General Purpose Register File ................................................................................11

6.5Stack Pointer ...........................................................................................................12

6.6Instruction Execution Timing ...................................................................................13

6.7Reset and Interrupt Handling ..................................................................................14

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

7.1Overview .................................................................................................................16

7.2In-System Reprogrammable Flash Program Memory .............................................16

7.3SRAM Data Memory ...............................................................................................18

7.4EEPROM Data Memory ..........................................................................................19

7.5I/O Memory ..............................................................................................................20

7.6Register Description ................................................................................................21

System Clock and Clock Options ......................................................... 26

8.1Clock Systems and their Distribution .......................................................................26

8.2Clock Sources .........................................................................................................27

8.3Low Power Crystal Oscillator ...................................................................................28

8.4Full Swing Crystal Oscillator ....................................................................................30

8.5Low Frequency Crystal Oscillator ............................................................................32

8.6Calibrated Internal RC Oscillator .............................................................................33

ATmega328P Datasheet(PDF) 441 Page - ATMEL Corporation