Rainbow-electronics ATmega3290P_V Manuel d'utilisateur télécharger pdf (Page 369)

ATmega329/3290/649/6490

2552H–AVR–11/06

Table of Contents Features................................................................................................ 1

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

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

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

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

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

Comparison between ATmega329, ATmega3290, ATmega649 and ATmega6490

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

Resources ............................................................................................ 8

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

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

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

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

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

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

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

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

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

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

AVR ATmega329/3290/649/6490 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..................................................................................................... 30

Clock Output Buffer ............................................................................................ 31

Timer/Counter Oscillator..................................................................................... 31

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

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

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Rainbow-electronics ATmega3290P_V Manuel d'utilisateur Page 369