ATmega3290P datasheet(378/385 Pages) ATMEL

378 / 385 page

8021E–AVR–07/09

ATmega329P/3290P

Table of Contents

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

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

1.1 Disclaimer .................................................................................................................3

Overview ................................................................................................... 4

2.1 Block Diagram ..........................................................................................................4

2.2 Comparison between ATmega329P and ATmega3290P .........................................5

2.3 Pin Descriptions .......................................................................................................6

Resources ................................................................................................. 9

Data Retention .......................................................................................... 9

About Code Examples ............................................................................. 9

AVR CPU Core ........................................................................................ 10

6.1 Overview ................................................................................................................10

6.2 Architectural Overview ...........................................................................................10

6.3 ALU – Arithmetic Logic Unit ...................................................................................11

6.4 AVR Status Register ..............................................................................................11

6.5 General Purpose Register File ...............................................................................13

6.6 Stack Pointer ..........................................................................................................14

6.7 Instruction Execution Timing ..................................................................................15

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

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

7.1 Overview ................................................................................................................18

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

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

7.4 EEPROM Data Memory .........................................................................................20

7.5 I/O Memory .............................................................................................................21

7.6 Register Description ...............................................................................................22

System Clock and Clock Options ......................................................... 27

8.1 Clock Systems and their Distribution ......................................................................27

8.2 Clock Sources ........................................................................................................28

8.3 Default Clock Source ..............................................................................................28

8.4 Crystal Oscillator ....................................................................................................29

8.5 Low-frequency Crystal Oscillator ............................................................................30

ATmega3290P Datasheet(PDF) 378 Page - ATMEL Corporation