目 录
引 言.................................................................................................................................................1
1 电子时钟的设计目的和要求.......................................................................................................2
1.1 设计目的.............................................................................................................................2
1.2 设计要求.............................................................................................................................2
2 电子时钟的设计流程...................................................................................................................3
2.1 总体方案的原理.................................................................................................................3
2.2 总体设计方案和框图.........................................................................................................3
........................................................................................................................................................3
3 系统硬件设计................................................................................................................................4
3.1 STC12C5A16S2 单片机..................................................................................................4
3.2 模块电路.............................................................................................................................5
3.2.1 复位电路与晶振电路..............................................................................................5
3.2.2 显示模块及芯片......................................................................................................5
3.３串口通讯单元....................................................................................................................7
3.４蜂鸣器单元........................................................................................................................7
3.４.1 鸣器的结构原理....................................................................................................7
3.４.2 蜂鸣器的驱动........................................................................................................7
3.4.3 蜂鸣器驱动电路......................................................................................................8
3.4.4 蜂鸣器驱动设计......................................................................................................9
4 系统软件设计..............................................................................................................................10
4.1 程序流程图.......................................................................................................................10
4.2 电子时钟主要程序...........................................................................................................11
5 安装调试......................................................................................................................................17
总 结................................................................................................................................................19
参 考 文 献.....................................................................................................................................20
附录 电路原理图............................................................................................................................21
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