![](https://csdnimg.cn/release/download_crawler_static/86211441/bg2.jpg)
定..............................................................................................................2
1.4 基本方
案 ....................................................................................................................3
1.4.1 设计课题简要概
述..............................................................................................3
1.4.2 系统软硬件划
分..................................................................................................3
1.4.3 单片机选
型..........................................................................................................3
1.5 总体设计框
图..............................................................................................................3
第 2 章硬件电路设
计......................................................................................................4
2.1 基本原理概
述..............................................................................................................4
2.2 主要原件参数与功能简
介..........................................................................................4
2.2.1 主控器
AT89S51...................................................................................................4
2.2.2 外部存储电路
AT24C02.......................................................................................5
2.3 单元电路的设
计..........................................................................................................7
2.3.1 显示电路设计.......................................................................................................7
2.3.2 键盘接口电路设计..............................................................................................8
2.3.3 响铃电路设计......................................................................................................9
2.4 电源电路的设
计........................................................................................................10
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