Datasheet

219
7701F–AVR–10/12
Atmel ATtiny24/44/84 [Preliminary]
30. Table of Contents
Features .................................................................................................. 1
1 Pin Configurations ................................................................................ 2
1.1 Disclaimer ......................................................................................................2
2 Overview ................................................................................................ 3
2.1 Block Diagram ................................................................................................3
2.2 Automotive Quality Grade ..............................................................................4
2.3 Pin Descriptions .............................................................................................5
3 Resources .............................................................................................. 6
4 About Code Examples .......................................................................... 6
5CPU Core ................................................................................................ 7
5.1 Overview ........................................................................................................7
5.2 Architectural Overview ...................................................................................7
5.3 ALU – Arithmetic Logic Unit ...........................................................................8
5.4 Status Register ...............................................................................................8
5.5 General Purpose Register File .....................................................................10
5.6 Stack Pointer ................................................................................................11
5.7 Instruction Execution Timing ........................................................................12
5.8 Reset and Interrupt Handling .......................................................................12
6 Memories .............................................................................................. 15
6.1 In-System Re-programmable Flash Program Memory .................................15
6.2 SRAM Data Memory ....................................................................................15
6.3 EEPROM Data Memory ...............................................................................17
6.4 I/O Memory ..................................................................................................21
6.5 Register Description .....................................................................................22
7 System Clock and Clock Options ...................................................... 25
7.1 Clock Systems and their Distribution ............................................................25
7.2 Clock Sources ..............................................................................................26
7.3 Default Clock Source ...................................................................................26
7.4 Crystal Oscillator ..........................................................................................27
7.5 Low-frequency Crystal Oscillator ..................................................................28
7.6 Calibrated Internal RC Oscillator ..................................................................29
7.7 External Clock ..............................................................................................29