基于单片机的呼叫系统的设计

论文编号:JD762  论文字数:23391,页数:46

摘  要

在大型机关，旅馆和医院中，常需要有一种内部联络和呼叫系统，以便在旅客（病员）和服务人员之间建立必要的联络。而一般的内部通话系统都比较少，经常使用的是比较便宜的呼叫指示。这种呼叫指示系统在提示的同时，能够用视频显示各呼叫的号码（房间号或床位号）。其另外优点是：由微控制器组成的呼叫指示系统结构则相对简单，成本低，操作也很方便。
本课题介绍了一种单片机呼叫系统的设计方案。该呼叫系统采用AT89s52单片机作为编程控制器，此单片机适用于机、电、仪一体化的智能产品，具有精度高、低功耗、控制能力、小巧等优点。并且采用ADC0809将模拟电压转换为数字形式，利用程序对单片机设置为外中断并且计算中断的时间。P0口分别与数码管的段码相连，P2口分别与数码管的位码相连。

关键词：单片机；程序；数码管；ADC0809；AT89S52；呼叫系统

Abstract

In the large-scale organ , in the hotel and hospital , often need a kind of inside and get in touch with and call out the system, in order to set up essential contact between passenger (patient ) and attendants. And general inside conversation system little, it uses to be cheap call instruct these kind of call that this text recommend point out the system is while briefing on often, can show the number that is each called out with the video (room number or berth number). Its other advantages are: This kind is pointed out the systematic structure is relatively simple by call that little controller makes up , with low costs, operation is very convenient too.
This subject has recommended a kind of one-chip computer to call out the systematic design plan . Is it call out system adopt AT89s52 one-chip computer as programming controller , one-chip computer this suitable for plane , electricity , appearance integrated intellectual products to it''s time, advantage of have high , low consumption of precision , control ability , small and exquisiting etc.. And adopt ADC0809 to imitate the voltage to change into the digital form . Establishes using the procedure to the monolithic integrated circuit for outside severs and the computation severance time. P0 port separately with digital tubesection code connected, the P2 port is separately connected with the digital tube position code.

Key words:  microcontroller computer；program；thenumber managing；
ADC0809；AT89S51；Calling system

目    录
引言 …………………………………………………………………………………………1
前言…………………………………………………………………………………………2
1  方案论证…………………………………………………………………………………3
2  系统各模块……………………………………………………………………………4
2.1 呼叫监测部分……………………………………………………………………………4
2.2 模拟/数字转换（ADC）部分……………………………………………………………5
2.2.1ADC0809主要性能……………………………………………………………………6
2.2.2A/D转换器的主要技术参数…………………………………………………………8
2.3显示部分…………………………………………………………………………………8
2.3.1LED共阳极数码管……………………………………………………………………8
2.3.2LED驱动电路的设计…………………………………………………………………10
2.4 主控电路CPU部分…………………………………………………………………13
2.4.1单片机的内部结构……………………………………………………………………14
2.4.2单片机应用系统的构成………………………………………………………………14
2.4.3AT89S52的特性及引脚说明…………………………………………………………15
2.4.4AT89S52的基本操作…………………………………………………………………17
2.4.5单片机与ADC0809 接口的问题……………………………………………………19
3  软件设计………………………………………………………………………………20
3.1 程序设计过程及流程图………………………………………………………………20
3.2 运算器…………………………………………………………………………………21
3.3 控制器…………………………………………………………………………………22
3.4 存储器…………………………………………………………………………………22
3.5 单片机编程语言介绍…………………………………………………………………24
4  设计所用软件………………………………………………………………………26
4.1 Protel 99SE的主要功能…………………………………………………………26
4.2 软件设计过程…………………………………………………………………………28
5   调试制作及安装……………………………………………………………………28
5.1 PCB板的制作…………………………………………………………………………29
5.2 呼叫指示器的安装……………………………………………………………………30
6   结论……………………………………………………………………………………31
谢辞…………………………………………………………………………………………32
参考文献……………………………………………………………………………………33
附录…………………………………………………………………………………………34