Rainbow-electronics ATmega8515L Manual de usuario descargar pdf (Pagina 6)

ATmega8515(L)

2512A–AVR–04/02

About Code

Examples

Thisdocumentation containssimple codeexamples that briefly showhow to usevarious

parts of the device. These codeexamples assume that the part specificheaderfileis

includedbefore compilation. Beawarethat not all C Compiler vendors include bit defini-

tions in the headerfiles and interrupt handling in C iscompilerdependent. Please

confirm with the CCompilerdocumentation for more details.

AVR CPU Core

Introduction Thissection discusses the AVR corearchitectureingeneral.Themainfunction of the

CPUcoreis to ensure correct program execution. The CPU musttherefore beableto

access memories, perform calculations, controlperipherals, andhandleinterrupts.

Architectural Overview Figure 3. Block Diagram of theAVRArchitecture

Inorder to maximize performanceandparallelism, the AVR uses a Harvard architecture

– withseparate memories andbusesforprogram anddata. Instructions in the program

memory areexecutedwith a single levelpipelining. Whileoneinstruction isbeing exe-

cuted, thenextinstruction ispre-fetchedfrom the program memory.Thisconcept

enables instructions to beexecuted in every clock cycle. The program memory isIn-

System reprogrammable Flash memory.

Flash

Program

Memory

Instruction

Decoder

Program

Counter

Control Lines

32x8

General

Purpose

Registrers

ALU

Status

and Control

I/O Lines

EEPROM

Data Bus 8-bit

Data

SRAM

Direct Addressing

Indirect Addressing

Interrupt

Unit

SPI

Unit

Watchdog

Timer

Analog

Comparator

I/O Module 2

I/O Module1

I/O Module n

1 2 3 4 5 6 7 8 9 10 11 ... 222 223

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