ATmega165 datasheet(331/336 Pages) ATMEL

331 / 336 page

ATmega165/V

2573G–AVR–07/09

Table of Contents

Features................................................................................................ 1

Pin Configurations............................................................................... 2

Disclaimer ............................................................................................................. 2

Overview............................................................................................... 3

Block Diagram ...................................................................................................... 3

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 ATmega165 Memories .............................................................. 15

In-System Reprogrammable Flash Program Memory ........................................ 15

SRAM Data Memory........................................................................................... 16

EEPROM Data Memory...................................................................................... 17

I/O Memory ......................................................................................................... 22

System Clock and Clock Options .................................................... 23

Clock Systems and their Distribution .................................................................. 23

Clock Sources..................................................................................................... 24

Default Clock Source .......................................................................................... 24

Crystal Oscillator................................................................................................. 25

Low-frequency Crystal Oscillator ........................................................................ 26

Calibrated Internal RC Oscillator ........................................................................ 27

External Clock..................................................................................................... 28

Clock Output Buffer ............................................................................................ 29

Timer/Counter Oscillator..................................................................................... 29

System Clock Prescaler...................................................................................... 29

Power Management and Sleep Modes............................................. 32

Idle Mode ............................................................................................................ 33

ADC Noise Reduction Mode............................................................................... 33

Power-down Mode.............................................................................................. 33

Power-save Mode............................................................................................... 33

Standby Mode..................................................................................................... 34

Power Reduction Register .................................................................................. 34

ATmega165 Datasheet(PDF) 331 Page - ATMEL Corporation

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