字符液晶显示的频率计

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1、目录1设计要求························································22设计方案与论证··················································22.1设计的思路··················································22.2总体方案····················································22.3总体框图··

2、··················································33设计原理及电路图················································33.1硬件原理·····················································33.1.1AT89C51介绍···············································33.1.2单片机最小系统·······

3、······································43.1.3液晶显示电16路···············································43.2电路图······················································53.2.1液晶显示电路···············································53.2.2时钟电路······················

4、·····························63.2.3控制电路···················································63.2.4字符液晶显示频率计的完整电路图·····························73.3软件设计···················································73.3.1软件环境··········································

5、·········73.3.2软件原理···················································83.3.3软件流程图·················································84器件清单······················································85器件识别与检测··············································96控制系统

6、实现16·················································96.1软件编程···················································96.2KeilC与Proteus的联调及仿真结果·····················127设计心得························································138参考文献·······················

7、·································131.设计要求（1）单片机通过I/O口接收输入信号。（2）单片机要通过I/O口控制液晶的初始化、显示方式以及要显示的字符。（3）液晶屏上能够完成部分数字或常用字符的显示。（4）能通过改变程序，提高测量精度。（5）设计字符液晶频率计的电路图，并用proteus软件进行仿真。（6）用单片机的c语言编写程序并导入单片机中进行模拟仿真。2.设计方案与论证2.1设计的思路（1）单片机部分：考虑到目前所学习的内容和设计的目的，决定选取AT89

8、C51.此单片机虽然属于低端机型，但足以满足设计的要求。选取其它的高端机型有些浪费。16（2）显示部分：该课程设计要求能够完成部分数字和常用字符的显示。若用数码管只能显示0~F，不能显示其他的字符和符号，所以不能用数码管。而选用LCD1602恰好符合要求，所以应用LCD1602。综上可得：采用定时器T1实现外部信号的频率输入，并利用T1计数器的计数功能和T0定时器的定时功能将脉冲的频率输入到LCD屏上。且可利用单刀多置开关实现多频率显示。2.2总体方案：该设计以单片机为核心，显示器