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188

7598H–AVR–07/09

ATtiny25/45/85

27.2 PC

Table of Contents

Default Chapter1
- Features1
1 Pin Configurations2
2 Overview2
- Block Diagram3
- Automotive Quality Grade4
- Pin Descriptions5
3 About Code Examples5
4 AVR CPU Core5
- Introduction5
- Architectural Overview6
- ALU - Arithmetic Logic Unit7
- Status Register7
- General Purpose Register File9
- Stack Pointer10
- Instruction Execution Timing11
- Reset and Interrupt Handling11
5 AVR Attiny25/45/85 Memories13
- In-System Re-Programmable Flash Program Memory13
- SRAM Data Memory14
- EEPROM Data Memory15
- I/O Memory21
6 System Clock and Clock Options21
- Clock Systems and Their Distribution21
- Clock Sources23
- Default Clock Source24
- Crystal Oscillator24
- Low-Frequency Crystal Oscillator25
- Calibrated Internal RC Oscillator26
- External Clock27
- 128 Khz Internal Oscillator28
- Clock Output Buffer29
- System Clock Prescaler29
7 Power Management and Sleep Modes31
- MCU Control Register - MCUCR31
- Idle Mode32
- ADC Noise Reduction Mode32
- Power-Down Mode32
- Limitations33
- Power Reduction Register33
- Minimizing Power Consumption34
8 System Control and Reset35
- Resetting the AVR35
- Reset Sources35
- Power-On Reset36
- External Reset37
- Brown-Out Detection38
- Watchdog Reset39
- MCU Status Register - MCUSR40
- Internal Voltage Reference40
- Watchdog Timer41
- Timed Sequences for Changing the Configuration of the Watchdog Timer44
9 Interrupts45
- Interrupt Vectors in Attiny25/45/8545
10 O Ports46
- Introduction46
- Ports as General Digital I/O47
- Alternate Port Functions52
- Register Description for I/O-Ports58
11 External Interrupts58
- MCU Control Register - MCUCR59
- General Interrupt Mask Register - GIMSK59
- General Interrupt Flag Register - GIFR60
- Pin Change Mask Register - PCMSK60
12 8-Bit Timer/Counter0 with PWM61
- Overview61
- Timer/Counter Clock Sources62
- Counter Unit62
- Output Compare Unit63
- Compare Match Output Unit65
- Modes of Operation66
- Timer/Counter Timing Diagrams70
- 8-Bit Timer/Counter Register Description72
13 Timer/Counter Prescaler78
- Prescaler Reset78
- External Clock Source79
14 Counter and Compare Units81
- Timer/Counter181
15 Dead Time Generator93
- Timer/Counter1 Dead Time Prescaler Register 1 - DTPS194
- Timer/Counter1 Dead Time a - DT1A95
- Timer/Counter1 Dead Time B - DT1B95
16 Universal Serial Interface - USI96
- Overview96
- Functional Descriptions97
- Alternative USI Usage103
- USI Register Descriptions103
17 Analog Comparator108
- ADC Control and Status Register B - ADCSRB108
- Analog Comparator Control and Status Register - ACSR108
- Analog Comparator Multiplexed Input110
18 Analog to Digital Converter111
- Features111
- Operation112
- Starting a Conversion113
- Prescaling and Conversion Timing114
- Changing Channel or Reference Selection117
- ADC Noise Canceler118
- ADC Conversion Result121
19 Debugwire On-Chip Debug System128
- Features128
- Overview128
- Physical Interface128
- Software Break Points129
- Limitations of Debugwire129
- Debugwire Related Register in I/O Memory129
20 Self-Programming the Flash130
- Performing Page Erase by SPM130
- Filling the Temporary Buffer130
- Performing a131
- Addressing the Flash During Self-Programming131
21 Memory Programming134
- Program and Data Memory Lock Bits134
- Fuse Bytes135
- Signature Bytes137
- Calibration Byte137
- Page Size137
- Serial Downloading138
- High-Voltage Serial Programming142
- High-Voltage Serial Programming Algorithm Sequence144
- High-Voltage Serial Programming Characteristics149
22 Electrical Characteristics150
- Absolute Maximum Ratings150
- External Clock Drive Waveforms151
- External Clock Drive152
- ADC Characteristics - Preliminary Data153
- Calibrated RC Oscillator Accuracy154
23 Typical Characteristics154
- Active Supply Current155
- Idle Supply Current157
- Power-Down Supply Current161
- Pin Pull-Up162
- Pin Driver Strength165
- Pin Thresholds and Hysteresis168
- BOD Thresholds and Analog Comparator Offset171
- Internal Oscillator Speed172
- Current Consumption of Peripheral Units175
- Current Consumption in Reset and Reset Pulse Width176
- Analog to Digital Converter177
24 Register Summary182
25 Instruction Set Summary184
26 Ordering Information186
27 Packaging Information187
28 Document Revision History189
- Revision 7598H - 07/09189
- Revision 7598G - 03/08189
- Revision 7598F - 11/07189
- Revision 7598E - 03/07189
- Revision 7598D - 02/07189
- Revision 7598C - 09/06189
- Revision 7598B - 08/06189
- Changes from Revision 2535A-09/01 to Revision 7598A-04/06189
29 Errata190
- Attiny25, Revision E190
- Attiny45, Revision G190
- Attiny85, Revision C190

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