ATmega16A datasheet(345/352 Pages) ATMEL

345 / 352 page

8154B–AVR–07/09

ATmega16A

Table of Contents

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

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

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

2.1

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

2.2

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

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

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

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

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

6.1

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

6.2

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

6.3

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

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 ......................................................... 24

8.1

Clock Systems and their Distribution ...............................................................24

8.2

Clock Sources .................................................................................................25

8.3

Default Clock Source .......................................................................................25

8.4

Crystal Oscillator .............................................................................................26

8.5

Low-frequency Crystal Oscillator .....................................................................27

8.6

External RC Oscillator .....................................................................................28

8.7

Calibrated Internal RC Oscillator .....................................................................29

8.8

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

ATmega16A Datasheet(PDF) 345 Page - ATMEL Corporation

ATmega16A Datasheet(HTML) 345 Page - ATMEL Corporation

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