《基于avr单片机的通用usb接口模块设计》

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1、基于AVR单片机的通用USB接口模块设计1引言　　USB接口以其数据传输快、连接简单、易于扩展、支持热插拔等特点已成为外设与PC通信的主要方式之一。随着嵌入式系统的发展，嵌入式微处理器需增加通用的USB接口，以便实现与PC等USB主机系统的通信。针对这样的需求，这里采用PHILIPS公司的USB接口器件PDIUSBD12和Atmel公司的AVR系列单片机ATmega8设计一种通用的USB接口模块。该模块可方便为各种嵌入式微处理器增加USB接口，从而实现与USB主机系统的高速通信。　　2系统硬件设计　　该系统模块的控制核心是AVR高速单片机ATmega8。AVR单片机是新一代基于哈佛结构

2、的高速RISC微控制器，具有速度快、价格低、可靠性高，I／O口线驱动能力强和片内集成外设资源丰富等特点，其内部集成有可进行ISP下载编程的Flash，EEPROM、熔丝位和锁定位。AVR单片机的ISP下载电缆制作简单、成本低廉，还有免费的下载软件(例如PonyProg)支持。PDIUSBD12是一款高性价比USB接口器件，完全符合USB1.l规范，易于与各种微处理器接口。Opinionsandsuggestionsontheparty'smasslineeducationalpracticeAccordingtothecentralandprovincial,municipalunif

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