六．硬件接线图················································（12） 七．实验源程序················································（13） 八．调试分析···················································（16） 九．设计总结···················································（16）
微机原理课程设计
一、设计目的Biblioteka （1）掌握 8086、8253、8254、8259 等常用芯片的使用及连接方法 （2）掌握 8253、8254 等初始化编程方式 （3）加深对中断控制方式的理解以及中断的具体使用 （4）学习使用 ADC0809 芯片进行数模转换 （5）深化汇编语言的编程思想同时对本学期所学内容进行综合
二、实验器件
8086、74LS138、74LS373、74LS245、8253、8255、ADC0809、7 段数码管、5KΩ 电位器、+5v 电源等
三、设计内容
利用《微型计算机原理》课程中所学的主要可编程接口芯片 74LS138、8253、8255A、 ADC0809 和中断控制器 8259 设计一个模拟电压采集电路。采用 ADC0809 设计一个单通 道模拟电压采集电路，要求对所接通道变化的模拟电压值进行采集，采集来的数字量送 至数码管 LED 指示，采集完 100 个数据后停止采集过程。
四、设计原理
1、设计思想
（1）利用 8086 和 74LS373 的连接进行地址的锁存，输出用作控制信号 A0-A4，其 中 A0，A1 接至 8253 及 8255 的 A0，A1 端，A2，A3，A4 用作 74LS138 译码器的输入
（1）8255 内部结构···············································（· 8） （2）8255 寻址··················································（8） （3）8255 工作方式控制字·······································（9） （4）8255 端口 C 置位/复位控制字·································（· 9） （5）8255 与 cpu 的连接···········································（· 9） （6）8255 初始化编程············································（10） 5、编写中断程序···········································（10）
五．程序流程图················································（11）
1、主程序流程图············································（11） 2、中断子程序流程图······································（12）
1、设计思想··················································（3） 2、ADC0809 简介·············································（3） （1）ADC0809 功能及引脚········································（3） （2）ADC 地址译码与通道选择····································（4） （3）ADC0809 工作时序图········································（4） （4）ADC0809 与系统总线的连接·································（5） (5)ADC0809 编程···············································（5） （6）8255 与 ADC0809 的连接示意图······························（6） 3、8253 简介·················································（6） （1）8253 内部结构···············································（· 6） （2）A0，A1 功能说明···········································（6） （3）8253 读写操作·············································（7） （4）8253 控制字···············································（7） （5）8253 初始化编程···········································（7） 4、8255 简介·················································（8）
目录
一．设计目的····················································（3） 二．实验器件····················································（3） 三．设计内容····················································（3） 四．设计原理····················································（3）