脉冲按键电话按键显示器设计

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1、目录1引言...................................................................................................................................................11.1背景说明........................................................................................................

2、..............................11.2设计任务及设计要求...................................................................................................................12设计方案....................................................................................................

3、........................................12.1实验基本原理..............................................................................................................................12.2设计要求分析..............................................................................

4、................................................22.1.1编码器真值表......................................................................................................................22.2.2号码输入显示控制模块状态表...................................................................

5、.........................22.2.3主控制模块状态表...............................................................................................................32.3系统设计思路与框图.....................................................................................................

6、..............32.4各模块功能分析..........................................................................................................................52.4.1按键电路模块.........................................................................................................

7、.............52.4.2译码电路模块......................................................................................................................52.4.3移位寄存器、锁存模式.......................................................................................................52

8、.4.4数码管显示模块...................................................................................................................63设计步骤和调试过程...............