ATtiny261A datasheet(287/292 Pages) ATMEL

287 / 292 page

8197A–AVR–10/09

ATtiny261A/461A/861A

Table of Contents

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

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

1.1

Pin Descriptions .................................................................................................3

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

2.1

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

General Information ................................................................................. 6

3.1

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

3.2

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

3.3

Data Retention ...................................................................................................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 ...........................................................................13

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 ..................................................................................31

6.4

Clock Output Buffer .........................................................................................32

6.5

Power Management and Sleep Modes ................................................. 34

7.1

Sleep Modes ....................................................................................................34

7.2

Software BOD Disable .....................................................................................35

ATtiny261A Datasheet(PDF) 287 Page - ATMEL Corporation

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