ATtiny13
Table of Contents	Features.................................................................................................	1
	Pin Configurations................................................................................	1
	Disclaimer .............................................................................................................	1
	Overview ................................................................................................	2
	Block Diagram ......................................................................................................	2
	Pin Descriptions....................................................................................................	3
	About Code Examples..........................................................................	3
	AVR CPU Core ......................................................................................	4
	Introduction ...........................................................................................................	4
	Architectural Overview..........................................................................................	4
	ALU – Arithmetic Logic Unit..................................................................................	5
	Status Register .....................................................................................................	6
	General Purpose Register File .............................................................................	7
	Stack Pointer ........................................................................................................	8
	Instruction Execution Timing.................................................................................	9
	Reset and Interrupt Handling................................................................................	9
	AVR ATtiny13 Memories ....................................................................	12
	In-System Re-programmable Flash Program Memory .......................................	12
	SRAM Data Memory...........................................................................................	13
	EEPROM Data Memory......................................................................................	14
	I/O Memory .........................................................................................................	19
	System Clock and Clock Options .....................................................	20
	Clock Systems and their Distribution ..................................................................	20
	Clock Sources.....................................................................................................	21
	Default Clock Source ..........................................................................................	21
	Calibrated Internal RC Oscillator ........................................................................	22
	External Clock.....................................................................................................	23
	128 kHz Internal Oscillator..................................................................................	24
	System Clock Prescaler......................................................................................	24
	Power Management and Sleep Modes..............................................	26
	Idle Mode ............................................................................................................	27
	ADC Noise Reduction Mode...............................................................................	27
	Power-down Mode..............................................................................................	27
	Minimizing Power Consumption .........................................................................	28
	System Control and Reset .................................................................	29
	Internal Voltage Reference .................................................................................	34
	Watchdog Timer .................................................................................................	35
	Timed Sequences for Changing the Configuration of the Watchdog Timer .......	39
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Interrupts .............................................................................................	40
Interrupt Vectors in ATtiny13 ..............................................................................	40
I/O Ports...............................................................................................	41
Introduction .........................................................................................................	41
Ports as General Digital I/O ................................................................................	42
Alternate Port Functions .....................................................................................	46
Register Description for I/O-Ports.......................................................................	50
External Interrupts ..............................................................................	51
8-bit Timer/Counter0 with PWM.........................................................	54
Overview.............................................................................................................	54
Timer/Counter Clock Sources.............................................................................	55
Counter Unit........................................................................................................	55
Output Compare Unit..........................................................................................	56
Compare Match Output Unit ...............................................................................	58
Modes of Operation ............................................................................................	59
Timer/Counter Timing Diagrams.........................................................................	63
8-bit Timer/Counter Register Description ...........................................................	65
Timer/Counter Prescaler ....................................................................	71
Analog Comparator ............................................................................	73
Analog Comparator Multiplexed Input ................................................................	75
Analog to Digital Converter ...............................................................	76
Features..............................................................................................................	76
Operation ............................................................................................................	77
Starting a Conversion .........................................................................................	78
Prescaling and Conversion Timing .....................................................................	79
Changing Channel or Reference Selection ........................................................	82
ADC Noise Canceler...........................................................................................	83
ADC Conversion Result......................................................................................	88
debugWIRE On-chip Debug System .................................................	92
Features..............................................................................................................	92
Overview.............................................................................................................	92
Physical Interface ...............................................................................................	92
Software Break Points ........................................................................................	93
Limitations of debugWIRE ..................................................................................	93
debugWIRE Related Register in I/O Memory .....................................................	93
Self-Programming the Flash ..............................................................	94
Addressing the Flash During Self-Programming ................................................	95

ii ATtiny13

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	ATtiny13
Memory Programming........................................................................	99
Program And Data Memory Lock Bits ................................................................	99
Fuse Bytes........................................................................................................	100
Signature Bytes ................................................................................................	101
Calibration Byte ................................................................................................	101
Page Size .........................................................................................................	101
Serial Downloading...........................................................................................	102
High-voltage Serial Programming.....................................................................	106
High-voltage Serial Programming Algorithm.....................................................	108
High-voltage Serial Programming Characteristics ............................................	113
Electrical Characteristics .................................................................	114
Absolute Maximum Ratings*.............................................................................	114
External Clock Drive Waveforms ......................................................................	115
External Clock Drive .........................................................................................	115
ADC Characteristics – Preliminary Data...........................................................	116
ATtiny13 Typical Characteristics – Preliminary Data ....................	117
Register Summary ............................................................................	135
Instruction Set Summary .................................................................	137
Ordering Information ........................................................................	139
Packaging Information .....................................................................	140
8P3 ...................................................................................................................	140
8S2 ...................................................................................................................	141
Erratas ...............................................................................................	142
ATtiny13
Rev. A.........................................................................................................................	142
Table of Contents ..................................................................................	i

iii

2535A–AVR–04/03

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