微机原理课程设计报告(电子秒表).doc

电子与控制工程学院
计算机原理与接口技术
课
程
设
计
姓名高强强
学号 3206100232
专业建筑设施智能技术
设计题目可任意启动停止的电子秒表
指导老师傅攀峰
目录
1电子秒表课程设计要求
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2关键字································································1
3摘要···································································1
4综合实验目的························································1
5引言···································································1
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8253可编程外围芯片介绍··········································3
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6程序流程图
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7程序源程序····························································11
8程序及硬件调试图····················································15
9设计心得·······························································17
10参考文献····························································18
可任意启动/停止的电子秒表
一、电子秒表课程设计要求
6位LED数码显示,计时单位为1/100秒。利用功能键进行启/停控制。其功能为:上电后计时器清0,当第一次(或奇数次)按下启/停键时开始计数。第2次(或偶数次)按下该键时停止计时,再一次按启/停键时清零后重新开始计时。
二、关键字
8086 8255 8253 控制字
三、摘要
用汇编语言设计数字秒表,用PROTUES仿真软件搭建的硬件电路上正确显示,并且具有开始停止清零功能。用8086作为处理器,,8255具备锁存和并行输出功能,驱动7段数码管正确显示,并且具有足够高的精度。。
四、综合实验目的:
通常,学****知识是由浅入深、由此及彼,一点点的学****和积累的,而应用知识则是综合运用所积累的知识来分析和解决实际问题、从知识的系统性来检验对各层次知识的掌握程度。
综合实验的目的是让学生把理论学****和实验教学阶段所掌握的知识通过一个设计实例,经历一次理论和实践结合、软件和硬件结合的综合训练,也是一次工程实践能力的检验。这次综合实验大家应当把它作为毕业设计的预演。
锻炼通过各种媒体和途径主动获取知识的能力。
五、引言
使用8253的通道0 工作在方式0计数,,并选用二进制技术,控制字36H,计数初值500,对1MHZ的CLK计数产生2000HZ的输出脉冲给1,2通道的CLK,通道一选用二进制计数即计数结束中断方式0,,8086开始计数即毫秒位计数并显示,并与10比较,等于给分秒位加一, 毫秒位置清零,分秒位与6比较若相等清零秒各位加一,秒个位与10比较若等于清零秒十位加一,秒十位与6比较若等于清零分个位加1,分个位与10比较若等于清零分十位加一,分十位与6比较若等于全部清零。
1、使用各芯片的作用及工作原理
1)定时器/计数器8253
用系统8253定时器提供的1MHZ定时单位,设计秒表定时程序。
有关系统定时方法: