第一章 AT89S51单片机实验及实践系统板简介┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅1 第二章 Keil C软件使用┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅14 第三章 AT89S51单片机下载器软件使用┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅25 第四章 实验及实践课题┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅28 1. 闪烁灯┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅28 2. 模拟开关灯┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅31 3. 多路开关状态指示┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅┅33 4. 广告灯的左移右移┅┅┅┅┅┅┅┅┅┅┅┅