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ATtiny26(L)

1477G–AVR–03/05

Notes: 1. Note that the PCINT1 Interrupt is only enabled if both the Global Interrupt Flag is

enabled, the PCIE1 flag in GIMSK is set and the alternate function of the pin is dis-

abled as described in “Pin Change Interrupt” on page 62

2. Not operator is marked with “~”.

Table 25. Overriding Signals for Alternate Functions in PA3..PA0

Signal

Name PA3/AREF/PCINT1 PA2/ADC2 PA1/ADC1 PA0/ADC0

PUOE ADMUX[REFS0] 0 0 0

PUOV0 000

DDOE ADMUX[REFS0] 0 0 0

DDOV 0 0 0 0

PVOE0 000

PVOV0 000

DIEOE PCINT1_ENABLE

(1)

•

(2)

ADMUX[REFS0]

000

DIEOV1 000

DIPCINT1 –––

AIO ANALOG REFERENCE INPUT ADC2 INPUT ADC1 INPUT ADC0 INPUT

Table of Contents Features1
Pin Configuration2
Description3
- Block Diagram4
- Pin Descriptions5
About Code Examples5
AVR CPU Core6
- Architectural Overview6
- General Purpose Register File7
- ALU - Arithmetic Logic Unit8
- Status Register - SREG9
- Stack Pointer - SP10
- Program and Data Addressing Modes10
Memories15
- In-System Programmable Flash Program Memory16
- SRAM Data Memory16
- EEPROM Data Memory17
- I/O Memory20
System Clock and Clock Options22
- Clock Systems and Their Distribution22
- Clock Sources24
- Default Clock Source25
- Crystal Oscillator25
- Low-Frequency Crystal Oscillator26
- External RC Oscillator27
- Calibrated Internal RC Oscillator28
- External Clock29
- High Frequency PLL Clock - PLLCLK30
System Control and Reset31
- Power-On Reset32
- External Reset33
- Brown-Out Detection34
- Watchdog Reset34
- MCU Status Register - MCUSR35
Power Management and Sleep Modes36
- MCU Control Register - MCUCR36
- Idle Mode37
- ADC Noise Reduction Mode37
- Power-Down Mode37
- Standby Mode38
- Minimizing Power Consumption39
I/O Ports41
- Introduction41
- Ports as General Digital I/O42
- Alternate Port Functions46
- Register Description for I/O Ports56
Interrupts57
- Interrupt Vectors57
- Interrupt Handling58
External Interrupt62
- Pin Change Interrupt62
Timer/Counters64
- Timer/Counter0 Prescaler64
- Timer/Counter1 Prescaler65
- 8-Bit Timer/Counter065
- 8-Bit Timer/Counter167
Watchdog Timer78
Universal Serial Interface - USI80
- Overview80
- Register Descriptions81
- Functional Descriptions85
- Alternative USI Usage90
Analog Comparator91
Analog to Digital Converter94
- Features94
- Operation95
- Prescaling and Conversion Timing96
- Changing Channel or Reference Selection98
- ADC Noise Canceler Function99
- ADC Conversion Result99
- Scanning Multiple Channels105
- ADC Noise Canceling Techniques105
- Offset Compensation Schemes105
Memory Programming107
- Program and Data Memory Lock Bits107
- Fuse Bits108
- Signature Bytes109
- Calibration Byte109
- Page Size109
- Parallel Programming Parameters, Pin Mapping, and Commands109
- Parallel Programming112
- Serial Downloading121
- Serial Programming Pin Mapping121
Electrical Characteristics126
- Absolute Maximum Ratings126
- DC Characteristics126
- External Clock Drive Waveforms128
- External Clock Drive128
- ADC Characteristics129
Attiny26 Typical Characteristics131
Register Summary168
Instruction Set Summary169
Ordering Information171
Packaging Information172
- 20P3172
- 173173
- 32M1-A174
Errata175
- Attiny26, All Revisions175
Datasheet Revision History176
- Changes from Rev. 1477F-12/04 to Rev. 1477G-03/05176
- Changes from Rev. 1477E-10/03 to Rev. 1477F-12/04176
- Changes from Rev. 1477D-05/03 to Rev. 1477E-10/03176
- Changes from Rev. 1477C-09/02 to Rev. 1477D-05/03176
- Changes from Rev. 1477B-04/02 to Rev. 1477C-09/02177
- Changes from Rev. 1477A-03/02 to Rev. 1477B-04/02177

Brand	Atmel
Model	ATtiny26
Category	Microcontrollers
Language	English

Atmel ATtiny26 User Manual

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