		ATtiny26(L)
Table of Contents	Features................................................................................................	1
	Pin Configuration.................................................................................	2
	Description ...........................................................................................	3
	Block Diagram ......................................................................................................	4
	Pin Descriptions....................................................................................................	5
	Resources ............................................................................................	6
	About Code Examples.........................................................................	7
	AVR CPU Core .....................................................................................	8
	Architectural Overview..........................................................................................	8
	General Purpose Register File .............................................................................	9
	ALU – Arithmetic Logic Unit................................................................................	10
	Status Register – SREG .....................................................................................	11
	Stack Pointer – SP..............................................................................................	12
	Program and Data Addressing Modes................................................................	12
	Memories ............................................................................................	17
	In-System Programmable Flash Program Memory ............................................	18
	SRAM Data Memory...........................................................................................	18
	EEPROM Data Memory......................................................................................	19
	I/O Memory .........................................................................................................	22
	System Clock and Clock Options ....................................................	24
	Clock Systems and their Distribution ..................................................................	24
	Clock Sources.....................................................................................................	26
	Default Clock Source ..........................................................................................	27
	Crystal Oscillator.................................................................................................	27
	Low-frequency Crystal Oscillator ........................................................................	28
	External RC Oscillator ........................................................................................	29
	Calibrated Internal RC Oscillator ........................................................................	30
	External Clock.....................................................................................................	31
	High Frequency PLL Clock – PLLCLK................................................................	32
	System Control and Reset ................................................................	33
	Power-on Reset ..................................................................................................	34
	External Reset ....................................................................................................	35
	Brown-out Detection ...........................................................................................	36
	Watchdog Reset .................................................................................................	36
	MCU Status Register – MCUSR.........................................................................	37
	Power Management and Sleep Modes.............................................	38
	MCU Control Register – MCUCR .......................................................................	38
		i
1477J–AVR–06/07

Idle Mode ............................................................................................................	39
ADC Noise Reduction Mode...............................................................................	39
Power-down Mode..............................................................................................	39
Standby Mode.....................................................................................................	40
Minimizing Power Consumption .........................................................................	41
I/O Ports..............................................................................................	43
Introduction .........................................................................................................	43
Ports as General Digital I/O ................................................................................	44
Alternate Port Functions .....................................................................................	48
Register Description for I/O Ports .......................................................................	58
Interrupts ............................................................................................	59
Interrupt Vectors .................................................................................................	59
Interrupt Handling ...............................................................................................	60
External Interrupt...............................................................................	64
Pin Change Interrupt...........................................................................................	64
Timer/Counters ..................................................................................	66
Timer/Counter0 Prescaler...................................................................................	66
Timer/Counter1 Prescaler...................................................................................	67
8-bit Timer/Counter0...........................................................................................	67
8-bit Timer/Counter1...........................................................................................	69
Watchdog Timer.................................................................................	80
Universal Serial Interface – USI........................................................	82
Overview.............................................................................................................	82
Register Descriptions..........................................................................................	83
Functional Descriptions ......................................................................................	87
Alternative USI Usage ........................................................................................	92
Analog Comparator ...........................................................................	93
Analog to Digital Converter ..............................................................	96
Features..............................................................................................................	96
Operation ............................................................................................................	97
Prescaling and Conversion Timing .....................................................................	98
Changing Channel or Reference Selection ......................................................	100
ADC Noise Canceler Function..........................................................................	101
ADC Conversion Result....................................................................................	101
Scanning Multiple Channels .............................................................................	107
ADC Noise Canceling Techniques ...................................................................	107
Offset Compensation Schemes ........................................................................	107

ii ATtiny26(L)

1477J–AVR–06/07

ATtiny26(L)

Memory Programming.....................................................................	109
Program and Data Memory Lock Bits...............................................................	109
Fuse Bits...........................................................................................................	110
Signature Bytes ................................................................................................	111
Calibration Byte ................................................................................................	111
Page Size .........................................................................................................	111
Parallel Programming Parameters, Pin Mapping, and Commands ..................	111
Parallel Programming .......................................................................................	114
Serial Downloading...........................................................................................	123
Serial Programming Pin Mapping .....................................................................	123
Electrical Characteristics................................................................	128
Absolute Maximum Ratings*.............................................................................	128
DC Characteristics............................................................................................	128
External Clock Drive Waveforms ......................................................................	130
External Clock Drive .........................................................................................	130
ADC Characteristics .........................................................................................	131
ATtiny26 Typical Characteristics ...................................................	133
Register Summary ...........................................................................	170
Instruction Set Summary ................................................................	171
Ordering Information.......................................................................	173
Packaging Information ....................................................................	174
20P3 .................................................................................................................	174
20S ...................................................................................................................	175
32M1-A .............................................................................................................	176
Errata ................................................................................................	177
ATtiny26, all revisions.......................................................................................	177
Datasheet Revision History ............................................................	178
Changes from Rev. 1477G-03/05 to Rev. 1477H-04/06...................................	178
Changes from Rev. 1477F-12/04 to Rev. 1477G-03/05 ...................................	178
Changes from Rev. 1477E-10/03 to Rev. 1477F-12/04 ...................................	178
Changes from Rev. 1477D-05/03 to Rev. 1477E-10/03 ...................................	178
Changes from Rev. 1477C-09/02 to Rev. 1477D-05/03...................................	179
Changes from Rev. 1477B-04/02 to Rev. 1477C-09/02 ...................................	179
Changes from Rev. 1477A-03/02 to Rev. 1477B-04/02 ...................................	179
Table of Contents .................................................................................	i

iii

1477J–AVR–06/07

iv ATtiny26(L)

1477J–AVR–06/07

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