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ATMEGA48-15AZV

8-bit Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

Atmel ATmega48/88/168 Automotive

3. About Code Examples

This documentation contains simple code examples that briefly show how to use various parts of

the device. These code examples assume that the part specific header file is included before

compilation. Be aware that not all C compiler vendors include bit definitions in the header files

and interrupt handling in C is compiler dependent. Please confirm with the C compiler documen-

tation for more details.

4. AVR CPU Core

4.1 Introduction

This section discusses the AVR core architecture in general. The main function of the CPU core

is to ensure correct program execution. The CPU must therefore be able to access memories,

perform calculations, control peripherals, and handle interrupts.

4.2 Architectural Overview

Figure 4-1. Block Diagram of the AVR Architecture

Data Bus 8-bit

Flash

Program

Memory

Instruction

Register

Instruction

Decoder

Control Lines

Program

Counter

Status

and Control

32 x 8

General

Purpose

Registrers

ALU

Interrupt

Unit

SPI

Unit

Watchdog

Timer

Analog

Comparator

Data

SRAM

EEPROM

I/O Module1

I/O Module 2

I/O Module n

I/O Lines

7

7530J–AVR–03/12

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