	ATmega8515(L)
Table of Contents	Features................................................................................................	1
	Pin Configurations...............................................................................	2
	Overview...............................................................................................	3
	Block Diagram ......................................................................................................	3
	Disclaimer .............................................................................................................	4
	AT90S4414/8515 and ATmega8515 Compatibility...............................................	4
	Pin Descriptions....................................................................................................	5
	About Code Examples.........................................................................	6
	AVR CPU Core .....................................................................................	7
	Introduction ...........................................................................................................	7
	Architectural Overview..........................................................................................	7
	ALU – Arithmetic Logic Unit..................................................................................	8
	Status Register .....................................................................................................	9
	General Purpose Register File ...........................................................................	10
	Stack Pointer ......................................................................................................	11
	Instruction Execution Timing...............................................................................	12
	Reset and Interrupt Handling..............................................................................	12
	AVR ATmega8515 Memories ............................................................	15
	In-System Reprogrammable Flash Program memory ........................................	15
	SRAM Data Memory...........................................................................................	16
	EEPROM Data Memory......................................................................................	18
	I/O Memory .........................................................................................................	23
	External Memory Interface..................................................................................	24
	XMEM Register Description................................................................................	28
	System Clock and Clock Options ....................................................	33
	Clock Systems and their Distribution ..................................................................	33
	Clock Sources.....................................................................................................	34
	Default Clock Source ..........................................................................................	34
	Crystal Oscillator.................................................................................................	34
	Low-frequency Crystal Oscillator ........................................................................	36
	External RC Oscillator ........................................................................................	37
	Calibrated Internal RC Oscillator ........................................................................	38
	External Clock.....................................................................................................	39
	Power Management and Sleep Modes.............................................	40
	Idle Mode ............................................................................................................	41
	Power-down Mode..............................................................................................	41
	Standby Mode.....................................................................................................	42
	Minimizing Power Consumption .........................................................................	42
		i
2512G–AVR–03/05

System Control and Reset ................................................................	44
Internal Voltage Reference .................................................................................	49
Watchdog Timer .................................................................................................	49
Timed Sequences for Changing the Configuration of the Watchdog Timer .......	52
Interrupts ............................................................................................	53
Interrupt Vectors in ATmega8515.......................................................................	53
I/O Ports..............................................................................................	58
Introduction .........................................................................................................	58
Ports as General Digital I/O ................................................................................	59
Alternate Port Functions .....................................................................................	63
Register Description for I/O Ports .......................................................................	74
External Interrupts.............................................................................	76
8-bit Timer/Counter0 with PWM........................................................	79
Overview.............................................................................................................	79
Timer/Counter Clock Sources.............................................................................	80
Counter Unit........................................................................................................	80
Output Compare Unit..........................................................................................	81
Compare Match Output Unit ...............................................................................	83
Modes of Operation ............................................................................................	84
Timer/Counter Timing Diagrams.........................................................................	88
8-bit Timer/Counter Register Description ...........................................................	90
Timer/Counter0 and Timer/Counter1 Prescalers ............................	94
16-bit Timer/Counter1........................................................................	96
Overview.............................................................................................................	96
Accessing 16-bit Registers .................................................................................	99
Timer/Counter Clock Sources...........................................................................	102
Counter Unit......................................................................................................	102
Input Capture Unit.............................................................................................	103
Output Compare Units ......................................................................................	105
Compare Match Output Unit .............................................................................	107
Modes of Operation ..........................................................................................	108
Timer/Counter Timing Diagrams.......................................................................	116
16-bit Timer/Counter Register Description .......................................................	118
Serial Peripheral Interface – SPI.....................................................	125
SS Pin Functionality..........................................................................................	129
Data Modes ......................................................................................................	132

ii ATmega8515(L)

2512G–AVR–03/05

ATmega8515(L)

USART ..............................................................................................	133
Single USART...................................................................................................	133
Clock Generation ..............................................................................................	135
Frame Formats .................................................................................................	138
USART Initialization..........................................................................................	139
Data Transmission – The USART Transmitter .................................................	140
Data Reception – The USART Receiver ..........................................................	143
Asynchronous Data Reception .........................................................................	146
Multi-processor Communication Mode .............................................................	149
Accessing UBRRH/UCSRC Registers..............................................................	151
USART Register Description ............................................................................	153
Examples of Baud Rate Setting........................................................................	157
Analog Comparator .........................................................................	162
Boot Loader Support – Read-While-Write Self-Programming.....	164
Features............................................................................................................	164
Application and Boot Loader Flash Sections ....................................................	164
Read-While-Write and No Read-While-Write Flash Sections...........................	164
Boot Loader Lock bits .......................................................................................	166
Entering the Boot Loader Program ...................................................................	167
Addressing the Flash During Self-Programming ..............................................	169
Self-Programming the Flash .............................................................................	170
Memory Programming.....................................................................	177
Program and Data Memory Lock bits ...............................................................	177
Fuse bits ...........................................................................................................	178
Signature Bytes ................................................................................................	179
Calibration Byte ................................................................................................	179
Calibration Byte ................................................................................................	179
Parallel Programming Parameters, Pin Mapping, and Commands ..................	180
Parallel Programming .......................................................................................	182
Serial Downloading...........................................................................................	191
Serial Programming Pin Mapping .....................................................................	191
Electrical Characteristics................................................................	195
External Clock Drive Waveforms ......................................................................	197
External Clock Drive .........................................................................................	197
SPI Timing Characteristics ...............................................................................	198
External Data Memory Timing ..........................................................................	200
ATmega8515 Typical Characteristics ............................................	205
Register Summary ...........................................................................	237
Instruction Set Summary ................................................................	239
	iii

2512G–AVR–03/05

Ordering Information.......................................................................	242
Packaging Information ....................................................................	244
44A ...................................................................................................................	244
40P6 .................................................................................................................	245
44J ....................................................................................................................	246
44M1.................................................................................................................	247
Errata ................................................................................................	248
ATmega8515(L) Rev. B ....................................................................................	248
Datasheet Revision History ............................................................	249
Changes from Rev. 2512F-12/03 to Rev. 2512G-03/05 ...................................	249
Changes from Rev. 2512F-12/03 to Rev. 2512E-09/03 ...................................	249
Changes from Rev. 2512D-02/03 to Rev. 2512E-09/03 ...................................	249
Changes from Rev. 2512C-10/02 to Rev. 2512D-02/03...................................	249
Changes from Rev. 2512B-09/02 to Rev. 2512C-10/02 ...................................	249
Changes from Rev. 2512A-04/02 to Rev. 2512B-09/02 ...................................	250
Table of Contents .................................................................................	i

iv ATmega8515(L)

2512G–AVR–03/05

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