文档介绍：基于AT89C2051单片机的电子定时器设计
【摘要】
随着时代的进步,电子行业的发展,定时器的应用也越来越广泛。但传统的定时器都是使用发条驱动式、电机传动式或电钟式等机械定时器。电子定时器相对产痛定时器来说,体积小、重量轻、造价低、精度高、寿命长、而且安全可靠、调整方便、适于频繁使用。本设计采用AT89C2051单片机为核心,阐述了系统工作原理,给出了软件流程。该电子定时器满足对电器的电源进行控制,同时要方便用户对电子定时器的操作。最大时间能达到30h,切最大精度可以到分钟
关键词:定时器;单片机;AT89C2051;动态扫描;继电器
【Abstract】
Progress , development of electron industry , the timer application are also more and more broad with the times. But, the tradition timer all is to use spring to drive machinery timers such as style , electric motor drive style or electric clock style. Come the electron timer to say volume is small , weight is light , cost of construction is low , accuracy is high , life-span is long, and safety is reliable , adjust to be suitable for being frequently put into use conveniently relatively painful timer of product. Have designed that the monolithic machine is core originally adopt AT89C2051 , have set forth system operating principle , have given a software out technological process. The power source go along being the electron timer's turn to be satisfied with electrical equipment is controlled , is wants the convenience of customers operation to electron timer at the same time. Maximal time can reach 30 hs , by all means maximal accuracy can arrive at a minute
Keywords: Timer; Monolithic machine; AT89C2051; Development is scanned; Relay
目录
1 引言 7
7
8
8
2 51单片机内部结构及计数原理 8
51单片机内部机构 8
11
3 电子定时器的设计 19
19
系统硬件电路设计 19
芯片的选择 19
交流控制接口电路 19
19
报警电路 19
系统程序的设计 20
主程序流程图 20
4 重要元件及重要电路 21
AT89C2051的内部结构及功能和引脚说明 21
AT89C2051主要性能 22
AT89C2051的内部结构 22
AT89C2051的引脚说明 24
继电器 26
、电磁继电器的工作原理和特性 26
、继电器主要产品技术参数 26
、继电器的电符号和触点形式 27
28
、数码管的分类 28
、数码管的驱动方式 28
5 软件设计 29
伪定义 29
中断入口 30
主程序 31
34
BCD子程序(加1或减1) 35
36
37
37
40
42