Rainbow-electronics ATmega64C1 Manuel d'utilisateur télécharger pdf (Page 359)

359

7647A–AVR–02/08

ATmega32/64/M1/C1

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

1 Pin Configurations ................................................................................... 3

1.1 Pin Descriptions .................................................................................................5

2 Overview ................................................................................................... 7

2.1 Block Diagram ...................................................................................................8

2.2 Automotive Quality Grade .................................................................................9

2.3 Pin Descriptions .................................................................................................9

2.4 About Code Examples .....................................................................................11

3 AVR CPU Core ........................................................................................ 12

3.1 Introduction ......................................................................................................12

3.2 Architectural Overview .....................................................................................12

3.3 ALU – Arithmetic Logic Unit .............................................................................13

3.4 Status Register ................................................................................................14

3.5 General Purpose Register File ........................................................................15

3.6 Stack Pointer ...................................................................................................16

3.7 Instruction Execution Timing ...........................................................................16

3.8 Reset and Interrupt Handling ...........................................................................17

4 Memories ................................................................................................ 20

4.1 In-System Reprogrammable Flash Program Memory .....................................20

4.2 SRAM Data Memory ........................................................................................20

4.3 EEPROM Data Memory ..................................................................................22

4.4 I/O Memory ......................................................................................................28

4.5 General Purpose I/O Registers .......................................................................28

5 System Clock ......................................................................................... 29

5.1 Clock Systems and their Distribution ...............................................................29

5.2 Clock Sources .................................................................................................30

5.3 Default Clock Source .......................................................................................31

5.4 Low Power Crystal Oscillator ...........................................................................31

5.5 Calibrated Internal RC Oscillator .....................................................................32

5.6 PLL ..................................................................................................................34

5.7 128 kHz Internal Oscillator ..............................................................................35

5.8 External Clock .................................................................................................35

5.9 Clock Output Buffer .........................................................................................36

5.10 System Clock Prescaler ..................................................................................36

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Rainbow-electronics ATmega64C1 Manuel d'utilisateur Page 359