ATtiny25 datasheet(191/196 Pages) ATMEL

191 / 196 page

191

7598H–AVR–07/09

ATtiny25/45/85

30. Table of Contents

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

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

Overview ................................................................................................... 2

2.1

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

2.2

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

2.3

Pin Descriptions .................................................................................................5

About Code Examples ............................................................................. 5

AVR CPU Core .......................................................................................... 5

4.1

Introduction ........................................................................................................5

4.2

Architectural Overview .......................................................................................6

4.3

ALU – Arithmetic Logic Unit ...............................................................................7

4.4

Status Register ..................................................................................................7

4.5

General Purpose Register File ..........................................................................9

4.6

Stack Pointer ...................................................................................................10

4.7

Instruction Execution Timing ...........................................................................11

4.8

Reset and Interrupt Handling ...........................................................................11

AVR ATtiny25/45/85 Memories ............................................................. 13

5.1

In-System Re-programmable Flash Program Memory ....................................13

5.2

SRAM Data Memory ........................................................................................14

5.3

EEPROM Data Memory ..................................................................................15

5.4

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

System Clock and Clock Options ......................................................... 21

6.1

Clock Systems and their Distribution ...............................................................21

6.2

Clock Sources .................................................................................................23

6.3

Default Clock Source .......................................................................................24

6.4

Crystal Oscillator .............................................................................................24

6.5

Low-frequency Crystal Oscillator .....................................................................25

6.6

Calibrated Internal RC Oscillator .....................................................................26

6.7

External Clock .................................................................................................27

6.8

128 kHz Internal Oscillator ..............................................................................28

6.9

Clock Output Buffer .........................................................................................29

6.10

System Clock Prescaler ..................................................................................29

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