	ATmega8535(L)
Table of Contents	Features................................................................................................	1
	Pin Configurations...............................................................................	2
	Disclaimer .............................................................................................................	2
	Overview...............................................................................................	3
	Block Diagram ......................................................................................................	3
	AT90S8535 Compatibility .....................................................................................	4
	Pin Descriptions....................................................................................................	5
	About Code Examples.........................................................................	6
	AVR CPU Core .....................................................................................	6
	Introduction ...........................................................................................................	6
	Architectural Overview..........................................................................................	6
	ALU – Arithmetic Logic Unit..................................................................................	7
	Status Register .....................................................................................................	8
	General Purpose Register File .............................................................................	9
	Stack Pointer ......................................................................................................	10
	Instruction Execution Timing...............................................................................	11
	Reset and Interrupt Handling..............................................................................	11
	AVR ATmega8535 Memories ............................................................	14
	In-System Reprogrammable Flash Program Memory ........................................	14
	SRAM Data Memory...........................................................................................	15
	EEPROM Data Memory......................................................................................	16
	I/O Memory .........................................................................................................	21
	System Clock and Clock Options ....................................................	22
	Clock Systems and their Distribution ..................................................................	22
	Clock Sources.....................................................................................................	23
	Default Clock Source ..........................................................................................	23
	Crystal Oscillator.................................................................................................	23
	Low-frequency Crystal Oscillator ........................................................................	26
	External RC Oscillator ........................................................................................	26
	Calibrated Internal RC Oscillator ........................................................................	27
	External Clock.....................................................................................................	29
	Timer/Counter Oscillator.....................................................................................	29
	Power Management and Sleep Modes.............................................	30
	Idle Mode ............................................................................................................	31
	ADC Noise Reduction Mode...............................................................................	31
	Power-down Mode..............................................................................................	31
	Power-save Mode...............................................................................................	31
	Standby Mode.....................................................................................................	32
	Extended Standby Mode ....................................................................................	32
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Minimizing Power Consumption .........................................................................	33
System Control and Reset ................................................................	34
Internal Voltage Reference .................................................................................	39
Watchdog Timer .................................................................................................	39
Timed Sequences for Changing the Configuration of the Watchdog Timer .......	43
Interrupts ............................................................................................	44
Interrupt Vectors in ATmega8535.......................................................................	44
I/O-Ports..............................................................................................	49
Introduction .........................................................................................................	49
Ports as General Digital I/O ................................................................................	50
Alternate Port Functions .....................................................................................	55
Register Description for I/O-Ports.......................................................................	64
External Interrupts.............................................................................	66
8-bit Timer/Counter0 with PWM........................................................	69
Overview.............................................................................................................	69
Timer/Counter Clock Sources.............................................................................	70
Counter Unit........................................................................................................	70
Output Compare Unit..........................................................................................	71
Compare Match Output Unit ...............................................................................	73
Modes of Operation ............................................................................................	74
Timer/Counter Timing Diagrams.........................................................................	78
8-bit Timer/Counter Register Description ...........................................................	81
Timer/Counter0 and Timer/Counter1 Prescalers ............................	85
16-bit Timer/Counter1........................................................................	87
Overview.............................................................................................................	87
Accessing 16-bit Registers .................................................................................	90
Timer/Counter Clock Sources.............................................................................	93
Counter Unit........................................................................................................	93
Input Capture Unit...............................................................................................	94
Output Compare Units ........................................................................................	96
Compare Match Output Unit ...............................................................................	98
Modes of Operation ............................................................................................	99
Timer/Counter Timing Diagrams.......................................................................	106
16-bit Timer/Counter Register Description .......................................................	108
8-bit Timer/Counter2 with PWM and Asynchronous Operation ..	115
Overview...........................................................................................................	115
Timer/Counter Clock Sources...........................................................................	116

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ATmega8535(L)

Counter Unit......................................................................................................	117
Output Compare Unit........................................................................................	117
Compare Match Output Unit .............................................................................	119
Modes of Operation ..........................................................................................	120
Timer/Counter Timing Diagrams.......................................................................	124
8-bit Timer/Counter Register Description .........................................................	126
Asynchronous Operation of the Timer/Counter ................................................	129
Timer/Counter Prescaler...................................................................................	132
Serial Peripheral Interface – SPI.....................................................	134
SS Pin Functionality..........................................................................................	138
Data Modes ......................................................................................................	141
USART ..............................................................................................	142
Overview...........................................................................................................	142
Clock Generation ..............................................................................................	143
Frame Formats .................................................................................................	146
USART Initialization..........................................................................................	147
Data Transmission – The USART Transmitter .................................................	149
Data Reception – The USART Receiver ..........................................................	152
Asynchronous Data Reception .........................................................................	155
Multi-processor Communication Mode .............................................................	159
Accessing UBRRH/UCSRC Registers..............................................................	160
USART Register Description ............................................................................	161
Examples of Baud Rate Setting........................................................................	167
Two-wire Serial Interface ................................................................	171
Features............................................................................................................	171
Two-wire Serial Interface Bus Definition...........................................................	171
Data Transfer and Frame Format .....................................................................	172
Multi-master Bus Systems, Arbitration and Synchronization ............................	174
Overview of the TWI Module ............................................................................	176
TWI Register Description..................................................................................	178
Using the TWI ...................................................................................................	182
Transmission Modes.........................................................................................	185
Multi-master Systems and Arbitration...............................................................	198
Analog Comparator .........................................................................	200
Analog Comparator Multiplexed Input ..............................................................	202
Analog-to-Digital Converter............................................................	203
Features............................................................................................................	203
Operation ..........................................................................................................	204
Starting a Conversion .......................................................................................	205
Prescaling and Conversion Timing ...................................................................	206
Changing Channel or Reference Selection ......................................................	209
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ADC Noise Canceler.........................................................................................	211
ADC Conversion Result....................................................................................	215
Boot Loader Support – Read-While-Write Self-Programming.....	221
Boot Loader Features .......................................................................................	221
Application and Boot Loader Flash Sections ....................................................	221
Read-While-Write and No Read-While-Write Flash Sections...........................	221
Boot Loader Lock Bits.......................................................................................	223
Entering the Boot Loader Program ...................................................................	224
Addressing the Flash during Self-Programming ...............................................	226
Self-Programming the Flash .............................................................................	227
Memory Programming.....................................................................	234
Program And Data Memory Lock Bits ..............................................................	234
Fuse Bits...........................................................................................................	235
Signature Bytes ................................................................................................	236
Calibration Byte ................................................................................................	236
Parallel Programming Parameters, Pin Mapping, and Commands ..................	237
Parallel Programming .......................................................................................	239
Serial Downloading...........................................................................................	248
Electrical Characteristics................................................................	252
Absolute Maximum Ratings*.............................................................................	252
DC Characteristics............................................................................................	252
External Clock Drive Waveforms ......................................................................	255
External Clock Drive .........................................................................................	255
Two-wire Serial Interface Characteristics .........................................................	256
SPI Timing Characteristics ...............................................................................	258
ADC Characteristics – Preliminary Data...........................................................	260
ATmega8535 Typical Characteristics – Preliminary Data............	263
Register Summary ...........................................................................	296
Instruction Set Summary ................................................................	298
Ordering Information.......................................................................	301
Packaging Information ....................................................................	302
44A ...................................................................................................................	302
40P6 .................................................................................................................	303
44J ....................................................................................................................	304
44M1-A .............................................................................................................	305
Errata ................................................................................................	306
ATmega8535 all rev..........................................................................................	306

iv ATmega8535(L)

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ATmega8535(L)

Datasheet Change Log for ATmega8535.......................................	307
Changes from Rev. 2502E-12/03 to Rev. 2502F-06/04 ...................................	307
Changes from Rev. 2502D-09/03 to Rev. 2502E-12/03 ...................................	307
Changes from Rev. 2502C-04/03 to Rev. 2502D-09/03...................................	307
Changes from Rev. 2502B-09/02 to Rev. 2502C-04/03 ...................................	307
Changes from Rev. 2502A-06/02 to Rev. 2502B-09/02 ...................................	308
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