目 录
一 引 言--------------------------------------------------------------------------------------------------------------1
二 设计任务和要求-----------------------------------------------------------------------------------------------------1
2.1 设计任务--------------------------------------------------------------------------------------------------------1
2.2 设计要求--------------------------------------------------------------------------------------------------------1
三 方案总体设计--------------------------------------------------------------------------------------------------------2
3.1 显示时间方案选择--------------------------------------------------------------------------------------------2
3.2 总体设计--------------------------------------------------------------------------------------------------------2
3.3 总体设计 --------------------------------------------------------------------------------------------------------2
四 硬件设计--------------------------------------------------------------------------------------------------------------4
4.1 单片机最小系统-----------------------------------------------------------------------------------------------4
4.1.1 STC89C52 单片机特征参数-------------------------------------------------------------------------4
4.1.2 STC89C52RC 关键引脚功效-------------------------------------------------------------------------4
4.1.3 STC89C52RC 中止源----------------------------------------------------------------------------------5
4.1.4 时钟电路-----------------------------------------------------------------------------------------------5
4.1.5 复位电路-----------------------------------------------------------------------------------------------6
4.2 数码换显示电路-----------------------------------------------------------------------------------------------6
4.3 红绿灯显示电路-----------------------------------------------------------------------------------------------8
4.4 整体电路--------------------------------------------------------------------------------------------------------9
五 软件设计 ------------------------------------------------------------------------------------------------------------10
5.1 KEIL C 介绍 --------------------------------------------------------------------------------------------------10
5.2 程序步骤图 ---------------------------------------------------------------------------------------------------10
5.3 keil 调试过程 -----------------------------------------------------------------------------------------------11
六 系统仿真--------------------------------------------------------------------------------------------------------------13
6.1 proteus 仿真软件介绍-------------------------------------------------------------------------------------13
6.2 仿真调试过程 ------------------------------------------------------------------------------------------------13
七 设计总结--------------------------------------------------------------------------------------------------------------15
参 考 文 献--------------------------------------------------------------------------------------------------------------16
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