ATMEGA8_08 Datasheet, PDF (303/308 Pages) ATMEL Corporation – 8-bit with 8K Bytes In-System Programmable Flash

Table of Contents
Features 1
Pin Configurations 2
Overview 3
Block Diagram 3
Disclaimer 4
Pin Descriptions 5
Resources 7
Data Retention 7
About Code Examples 8
AVR CPU Core 9
Introduction 9
Architectural Overview 9
Arithmetic Logic Unit – ALU 11
Status Register 11
General Purpose Register File 12
Stack Pointer 13
Instruction Execution Timing 13
Reset and Interrupt Handling 14
AVR ATmega8 Memories 17
In-System Reprogrammable Flash Program Memory 17
SRAM Data Memory 18
Data Memory Access Times 19
EEPROM Data Memory 19
I/O Memory 24
System Clock and Clock Options 25
Clock Systems and their Distribution 25
Clock Sources 26
Crystal Oscillator 27
Low-frequency Crystal Oscillator 28
External RC Oscillator 28
Calibrated Internal RC Oscillator 30
External Clock 32
Timer/Counter Oscillator 32
Power Management and Sleep Modes 33
Idle Mode 34
2486T–AVR–05/08
ATmega8(L)
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