ATtiny44 datasheet(231/236 Pages) ATMEL

231 / 236 page

8006H–AVR–10/09

ATtiny24/44/84

Table of Contents

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

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

1.1

Pin Descriptions .................................................................................................2

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

About ......................................................................................................... 6

3.1

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

3.2

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

3.3

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

3.4

Disclaimer ..........................................................................................................6

4CPU Core .................................................................................................. 7

4.1

Architectural Overview .......................................................................................7

4.2

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

4.3

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

4.4

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

4.5

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

4.6

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

4.7

Reset and Interrupt Handling ...........................................................................12

Memories ................................................................................................ 15

5.1

In-System Re-programmable Flash Program Memory ....................................15

5.2

SRAM Data Memory ........................................................................................15

5.3

EEPROM Data Memory ..................................................................................16

5.4

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

5.5

Clock System ......................................................................................... 24

6.1

Clock Subsystems ...........................................................................................24

6.2

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

6.3

System Clock Prescaler ..................................................................................30

6.4

Clock Output Buffer .........................................................................................30

6.5

Power Management and Sleep Modes ................................................. 33

7.1

Sleep Modes ....................................................................................................33

7.2

Software BOD Disable .....................................................................................34

ATtiny44 Datasheet(PDF) 231 Page - ATMEL Corporation

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