ATMEGA6450-16AI(2004) データシートの表示（PDF） - Atmel Corporation

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ATMEGA6450-16AI
(Rev.:2004)

8-bit Microcontroller with In-System Programmable Flash

Atmel Corporation 

Table of Contents

2570A–AVR–09/04

ATmega325/3250/645/6450

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

Features (Continued)........................................................................... 2

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

Disclaimer ............................................................................................................. 3

Overview............................................................................................... 4

Block Diagram ...................................................................................................... 4

Comparison between ATmega325, ATmega3250, ATmega645 and ATmega6450

6

Pin Descriptions.................................................................................................... 6

About Code Examples......................................................................... 8

AVR CPU Core ..................................................................................... 9

Introduction ........................................................................................................... 9

Architectural Overview.......................................................................................... 9

ALU – Arithmetic Logic Unit................................................................................ 10

Status Register ................................................................................................... 11

General Purpose Register File ........................................................................... 12

Stack Pointer ...................................................................................................... 13

Instruction Execution Timing............................................................................... 14

Reset and Interrupt Handling.............................................................................. 14

AVR ATmega325/3250/645/6450 Memories ..................................... 17

In-System Reprogrammable Flash Program Memory ........................................ 17

SRAM Data Memory........................................................................................... 18

EEPROM Data Memory...................................................................................... 19

I/O Memory ......................................................................................................... 24

System Clock and Clock Options .................................................... 25

Clock Systems and their Distribution .................................................................. 25

Clock Sources..................................................................................................... 26

Default Clock Source .......................................................................................... 26

Crystal Oscillator................................................................................................. 26

Low-frequency Crystal Oscillator ........................................................................ 28

Calibrated Internal RC Oscillator ........................................................................ 28

External Clock..................................................................................................... 29

Clock Output Buffer ............................................................................................ 30

Timer/Counter Oscillator..................................................................................... 30

System Clock Prescaler...................................................................................... 31

Power Management and Sleep Modes............................................. 33

Idle Mode ............................................................................................................ 34

ADC Noise Reduction Mode............................................................................... 34

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