Rainbow-electronics ATtiny861_V Manual do Utilizador descarregar pdf (Página 231)

2588B–AVR–11/06

ATtiny261/461/861

Table of Contents

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

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

1.1 Disclaimer .................................................................................................................2

2 Overview ................................................................................................... 3

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

2.2 Pin Descriptions ........................................................................................................4

3 Resources ................................................................................................. 6

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

5 AVR CPU Core .......................................................................................... 8

5.1 Overview ...................................................................................................................8

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

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

5.4 General Purpose Register File ...............................................................................11

5.5 Stack Pointer ..........................................................................................................12

5.6 Instruction Execution Timing ..................................................................................13

5.7 Reset and Interrupt Handling ..................................................................................13

6 AVR Memories ........................................................................................ 16

6.1 In-System Re-programmable Flash Program Memory ...........................................16

6.2 SRAM Data Memory ...............................................................................................16

6.3 EEPROM Data Memory .........................................................................................17

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

6.5 Register Description ...............................................................................................21

7 System Clock and Clock Options ......................................................... 24

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

7.2 Clock Sources ........................................................................................................26

7.3 Default Clock Source ..............................................................................................26

7.4 External Clock ........................................................................................................26

7.5 High Frequency PLL Clock - PLLCLK ....................................................................27

7.6 Calibrated Internal RC Oscillator ............................................................................28

7.7 128 kHz Internal Oscillator .....................................................................................29

7.8 Low-frequency Crystal Oscillator ............................................................................29

7.9 Crystal Oscillator ....................................................................................................29

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Rainbow-electronics ATtiny861_V Manual do Utilizador Página 231