ATmega32A datasheet(345/352 Pages) ATMEL

345 / 352 page

8155B–AVR–07/09

ATmega32A

Table of Contents

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

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

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

2.1

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

2.2

Pin Descriptions .................................................................................................4

Resources ................................................................................................. 6

Data Retention .......................................................................................... 6

About Code Examples ............................................................................. 6

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

6.1

Overview ............................................................................................................7

6.2

ALU – Arithmetic Logic Unit ...............................................................................8

6.3

Status Register ..................................................................................................8

6.4

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

6.5

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

6.6

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

6.7

Reset and Interrupt Handling ...........................................................................13

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 ..................................................................................19

7.5

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

7.6

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

8.1

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

8.2

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

8.3

Default Clock Source .......................................................................................26

8.4

Crystal Oscillator .............................................................................................27

8.5

Low-frequency Crystal Oscillator .....................................................................28

8.6

External RC Oscillator .....................................................................................29

8.7

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

8.8

External Clock .................................................................................................30

ATmega32A Datasheet(PDF) 345 Page - ATMEL Corporation

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