ATtiny261-ESSZ datasheet(222/227 Pages) ATMEL

222 / 227 page

222

7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

31. Table of Contents

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

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

1.1

Disclaimer ..........................................................................................................3

1.2

Automotive Quality Grade .................................................................................3

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

2.1

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

2.2

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

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

About Code Examples ............................................................................. 8

AVR CPU Core .......................................................................................... 9

5.1

Overview ............................................................................................................9

5.2

ALU – Arithmetic Logic Unit .............................................................................10

5.3

Status Register ................................................................................................11

5.4

General Purpose Register File ........................................................................12

5.5

Stack Pointer ...................................................................................................13

5.6

Instruction Execution Timing ...........................................................................14

5.7

Reset and Interrupt Handling ...........................................................................15

AVR Memories ........................................................................................ 17

6.1

In-System Re-programmable Flash Program Memory ....................................17

6.2

SRAM Data Memory ........................................................................................17

6.3

EEPROM Data Memory ..................................................................................18

6.4

I/O Memory ......................................................................................................22

6.5

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

7.1

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

7.2

Clock Sources .................................................................................................27

7.3

Default Clock Source .......................................................................................27

7.4

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

7.5

High Frequency PLL Clock - PLLCLK .............................................................28

7.6

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

7.7

128 kHz Internal Oscillator ..............................................................................30

7.8

Low-frequency Crystal Oscillator .....................................................................30

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