Rainbow-electronics ATmega8515L Manual de usuario descargar pdf (Pagina 219)

ATmega8515(L)

2512A–AVR–04/02

Table of Contents

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

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

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

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

Disclaimer ............................................................................................................. 4

AT90S4414/8515 and ATmega8515 Compatibility............................................... 4

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

About Code Examples.......................................................................... 6

AVR CPU Core ...................................................................................... 6

Introduction ........................................................................................................... 6

ArchitecturalOverview.......................................................................................... 6

ALU –ArithmeticLogicUnit.................................................................................. 7

Status Register ..................................................................................................... 8

General PurposeRegisterFile ............................................................................. 9

Stack Pointer ...................................................................................................... 10

Instruction Execution Timing............................................................................... 11

Reset andInterrupt Handling.............................................................................. 11

AVR ATmega8515 Memories ............................................................. 14

In-System Reprogrammable Flash Program Memory ........................................ 14

SRAMData Memory........................................................................................... 15

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

I/OMemory ......................................................................................................... 22

ExternalMemory Interface.................................................................................. 22

XMEM RegisterDescription................................................................................ 27

System Clock and Clock Options ..................................................... 31

Clock Systems and theirDistribution.................................................................. 31

Clock Sources..................................................................................................... 32

CrystalOscillator................................................................................................. 32

Low-frequency CrystalOscillator ........................................................................ 34

External RCOscillator ........................................................................................ 35

CalibratedInternal RCOscillator ........................................................................ 36

ExternalClock..................................................................................................... 37

Power Management and Sleep Modes.............................................. 38

Idle Mode............................................................................................................ 39

Power-down Mode.............................................................................................. 39

Standby Mode..................................................................................................... 40

Minimizing PowerConsumption ......................................................................... 40

System Control and Reset ................................................................. 42

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Rainbow-electronics ATmega8515L Manual de usuario Pagina 219