单片机与pc机通讯8251A可编程通讯接口与PC机通讯.doc

课程设计IV
设计说明书
8251A可编程通讯接口与PC机通讯
学生姓名
周勇
学号
班级
计本103班
成绩
指导教师
冯永政
数学与计算机科学学院
2013年9月10日
课程设计任务书
2013—2014学年第一学期
专业: 计算机科学与技术学号: 姓名: 周勇
课程设计名称: 课程设计IV
设计题目: 8251A可编程通讯接口与PC机通讯
完成期限:自 2013 年 9 月 2日至 2013年 9 月 14 日共 2 周
设计依据要求及主要内容
一、目的任务:
依据实验器材提供的功能,利用可编程串行接口8251芯片,实现与PC机通讯。
二、设计内容:
1. 复习相关课程内容:微机原理及应用课程相关内容;汇编语言程序设计的相关内容;熟悉模拟电路、数字电路的相关知识;
2. 熟悉实验相关器材的主要功能。
3. 在上述基础上,根据课程设计的基本要求,完成以下各项任务(反映在设计说明书中):
(1)题目要求涉及的硬件电路图及摘要说明。
(2)题目的工作原理及相应描述。
(3)程序流程框图。
(4)程序文本输入及实验完成。
三、设计要求:
;(用专用软件);;。
课程设计评阅
评语:
指导教师签名:
年月日
摘要
设计了一个8251可编程通讯接口与PC机通信,8251是一种可编程的通用同步/异步接收发送器,被广泛应用于Intel80X86为CPU的微型计算机中。本设计采用8253芯片的分频作为8251的收发时钟频率,实现8251可编程通信接口与PC机的通讯。
关键词:异步;串行通信;8251
目录
1课题描述··································································1
2课题分析··································································2
8251基本功能····························································2
8251的内部结构··························································2
8251编程字·····························································2
··································································4
电路图设计······························································4
硬件设计·······························································4
软件设计·······························································4
4验证测试·································································12
5总结·····································································13
参考文献··································································14
1 课题描述
利用8253芯片的分频作为8251的收发时钟频率,8251异步串行通信,实现8251可编程通信接口与PC机的通讯。采用查询 I/O方式,故收/发程序中只需检查发/收准备好的状态是否置位,即可收发 l个字节,每按动一次任一数字键,就把该键值通过8251发送给PC机接收,并在PC机屏幕上显示出该键值。
2 课题分析
8251基本功能
8251A是一种可编程的通用同步/异步接收发送器,通常作为串行通信接口使用,被广泛应用Intel80X86为CPU的微型计算机中。其基本功能为:
(1)它是全双工、双缓冲器的接收/发送器。
(2)可工作在同步或异步工作方式。同步方式工作时,波特率在0~64K范围内;异步方式时,波特率在0~ 。
(3)同步方式时,字符可选择为5~8bit,可加奇偶校验