ATtiny2313
Table of Contents	Features................................................................................................	1
	Pin Configurations...............................................................................	2
	Overview...............................................................................................	2
	Block Diagram ......................................................................................................	3
	Pin Descriptions....................................................................................................	5
	About Code Examples.........................................................................	5
	Disclaimer.............................................................................................	5
	AVR CPU Core .....................................................................................	6
	Introduction ...........................................................................................................	6
	Architectural Overview..........................................................................................	6
	ALU – Arithmetic Logic Unit..................................................................................	7
	Status Register .....................................................................................................	7
	General Purpose Register File .............................................................................	8
	Stack Pointer ......................................................................................................	10
	Instruction Execution Timing...............................................................................	10
	Reset and Interrupt Handling..............................................................................	11
	AVR ATtiny2313 Memories ...............................................................	13
	In-System Reprogrammable Flash Program Memory ........................................	13
	SRAM Data Memory...........................................................................................	14
	EEPROM Data Memory......................................................................................	15
	I/O Memory .........................................................................................................	20
	System Clock and Clock Options ....................................................	21
	Clock Systems and their Distribution ..................................................................	21
	Clock Sources.....................................................................................................	22
	Default Clock Source ..........................................................................................	22
	Crystal Oscillator.................................................................................................	22
	Calibrated Internal RC Oscillator ........................................................................	24
	External Clock.....................................................................................................	26
	128 kHz Internal Oscillator..................................................................................	27
	Power Management and Sleep Modes.............................................	29
	Idle Mode ............................................................................................................	29
	Power-down Mode..............................................................................................	30
	Standby Mode.....................................................................................................	30
	Minimizing Power Consumption .........................................................................	30
	System Control and Reset ................................................................	32
	Internal Voltage Reference .................................................................................	37
	Watchdog Timer .................................................................................................	38
		i

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Interrupts ............................................................................................	43
Interrupt Vectors in ATtiny2313 ..........................................................................	43
I/O-Ports..............................................................................................	45
Introduction .........................................................................................................	45
Ports as General Digital I/O ................................................................................	46
Alternate Port Functions .....................................................................................	50
Register Description for I/O-Ports.......................................................................	57
External Interrupts.............................................................................	58
Pin Change Interrupt Timing...............................................................................	58
8-bit Timer/Counter0 with PWM........................................................	62
Overview.............................................................................................................	62
Timer/Counter Clock Sources.............................................................................	63
Counter Unit........................................................................................................	63
Output Compare Unit..........................................................................................	64
Compare Match Output Unit ...............................................................................	65
Modes of Operation ............................................................................................	66
Timer/Counter Timing Diagrams.........................................................................	71
8-bit Timer/Counter Register Description ...........................................................	73
Timer/Counter0 and Timer/Counter1 Prescalers ............................	80
16-bit Timer/Counter1........................................................................	82
Overview.............................................................................................................	82
Accessing 16-bit Registers .................................................................................	84
Timer/Counter Clock Sources.............................................................................	88
Counter Unit........................................................................................................	88
Input Capture Unit...............................................................................................	89
Output Compare Units ........................................................................................	91
Compare Match Output Unit ...............................................................................	93
Modes of Operation ............................................................................................	94
Timer/Counter Timing Diagrams.......................................................................	102
16-bit Timer/Counter Register Description .......................................................	104
USART ..............................................................................................	111
Overview...........................................................................................................	111
Clock Generation ..............................................................................................	112
Frame Formats .................................................................................................	115
USART Initialization..........................................................................................	116
Data Transmission – The USART Transmitter .................................................	118
Data Reception – The USART Receiver ..........................................................	121
Asynchronous Data Reception .........................................................................	124
Multi-processor Communication Mode .............................................................	128
USART Register Description ............................................................................	129

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ATtiny2313

Examples of Baud Rate Setting........................................................................	134
Universal Serial Interface – USI......................................................	138
Overview...........................................................................................................	138
Functional Descriptions ....................................................................................	139
Alternative USI Usage ......................................................................................	144
USI Register Descriptions.................................................................................	144
Analog Comparator .........................................................................	149
debugWIRE On-chip Debug System ..............................................	151
Features............................................................................................................	151
Overview...........................................................................................................	151
Physical Interface .............................................................................................	151
Software Break Points ......................................................................................	152
Limitations of debugWIRE ................................................................................	152
debugWIRE Related Register in I/O Memory ...................................................	152
Self-Programming the Flash...........................................................	153
Addressing the Flash During Self-Programming ..............................................	154
Memory Programming.....................................................................	158
Program And Data Memory Lock Bits ..............................................................	158
Fuse Bits...........................................................................................................	159
Signature Bytes ................................................................................................	160
Calibration Byte ................................................................................................	160
Page Size .........................................................................................................	160
Parallel Programming Parameters, Pin Mapping, and Commands ..................	161
Serial Programming Pin Mapping .....................................................................	163
Parallel Programming .......................................................................................	163
Serial Downloading...........................................................................................	172
Electrical Characteristics................................................................	177
Absolute Maximum Ratings*.............................................................................	177
DC Characteristics............................................................................................	177
External Clock Drive Waveforms ......................................................................	178
External Clock Drive .........................................................................................	178
Maximum Speed vs. VCC ........................................................................................................................	180
ATtiny2313 Typical Characteristics ...............................................	181
Register Summary ...........................................................................	211
Instruction Set Summary ................................................................	213
Ordering Information.......................................................................	215
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Packaging Information ....................................................................	216
20P3 .................................................................................................................	216
20S ...................................................................................................................	217
20M1.................................................................................................................	218
Errata ................................................................................................	219
ATtiny2313 Rev B.............................................................................................	219
ATtiny2313 Rev A.............................................................................................	219
Datasheet Revision History ............................................................	220
Changes from Rev. 2514F-08/04 to Rev. 2514G-10/04 ...................................	220
Changes from Rev. 2514F-08/04 to Rev. 2514G-10/04 ...................................	220
Changes from Rev. 2514E-04/04 to Rev. 2514F-08/04 ...................................	220
Changes from Rev. 2514D-03/04 to Rev. 2514E-04/04 ...................................	220
Changes from Rev. 2514C-12/03 to Rev. 2514D-03/04...................................	221
Changes from Rev. 2514B-09/03 to Rev. 2514C-12/03 ...................................	221
Changes from Rev. 2514A-09/03 to Rev. 2514B-09/03 ...................................	221
Table of Contents .................................................................................	i

iv ATtiny2313

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2543H–AVR–02/05