ATtiny24-20MU datasheet(7/236 Pages) ATMEL

Part #	ATtiny24-20MU

Description	8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

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7

8006H–AVR–10/09

ATtiny24/44/84

4.

CPU Core

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.

4.1

Architectural Overview

Figure 4-1.

Block Diagram of the AVR Architecture

In order to maximize performance and parallelism, the AVR uses a Harvard architecture – with

separate memories and buses for program and data. Instructions in the Program memory are

executed with a single level pipelining. While one instruction is being executed, the next instruc-

tion is pre-fetched from the Program memory. This concept enables instructions to be executed

in every clock cycle. The Program memory is In-System Reprogrammable Flash memory.

Flash

Program

Memory

Instruction

Register

Instruction

Decoder

Program

Counter

Control Lines

32 x 8

General

Purpose

Registrers

ALU

Status

and Control

I/O Lines

EEPROM

Data Bus 8-bit

Data

SRAM

Interrupt

Unit

Watchdog

Timer

Analog

Comparator

Timer/Counter 0

Timer/Counter 1

Universal

Serial Interface

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ATtiny24-20MU Datasheet(PDF) 7 Page - ATMEL Corporation

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