目录
一、实验目的 .......................................................................................................................................................3
二、设计要求 .......................................................................................................................................................3
三、系统总览 .......................................................................................................................................................3
四、实验所用模块及连线 ..................................................................................................................................4
1. 8254 定时/计数器...................................................................................................................................4
a.
8254 的基本特点 ............................................................................................................................4
b 8254的内部结构及芯片的引脚定义 ............................................................................................4
c 芯片的连线 ........................................................................................................................................4
2. 8259 中断控制器.....................................................................................................................................5
a.
8259 的基本特点 ............................................................................................................................5
3. 8255 并行输入/输出接口芯片 ..............................................................................................................5
a.
8255 的基本特点.............................................................................................................................5
b.8255 内部结构及芯片的引脚定义 .............................................................................................5
c. 芯片实现功能 ...................................................................................................................................5
4. 矩阵键盘...................................................................................................................................................6
5. 数码管及LED 灯显示.............................................................................................................................8
6.8254发声单元............................................................................................................................................9
7.IR7 中断服务程序............................................................................................................................................10
五、汇编源程序.................................................................................................................................................11
六、调试中出现的问题 ....................................................................................................................................17
1. 按键跳转只能进入一次........................................................................................................................17
2. 数码管显示不正常 ................................................................................................................................17
3. 调试时想知道子程序中的某些程序是否被执行 ...............................................................................18
七、分析与总结.................................................................................................................................................18
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