Rainbow Electronics ATtiny861_V - Manual (Page 231)

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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