目 录
摘要.......................................................................................................................I
第 1 章 绪论 ........................................................................................................1
1.1 课题背景 ...................................................................................................1
1.2 本章小结 ...................................................................................................1
第 2 章 硬件电路设计 ........................................................................................3
2.1 硬件最小系统设计 ...................................................................................3
2.1.1 核心芯片 AT89C51 简介 ..................................................................3
2.1.2 复位电路的设计 ................................................................................4
2.1.3 时钟电路的设计 ................................................................................5
2.1.4 存储器的分配 ....................................................................................6
2.2 时钟电路的设计 .......................................................................................6
2.2.1 DS1302 芯片简介 ...............................................................................6
2.2.2 DS1302 与单片机的硬件电路的设计 ...............................................7
2.3 显示提示电路的设计 ...............................................................................8
2.3.1 液晶显示原理 ....................................................................................8
2.3.2 SMC1602 芯片简介............................................................................9
2.3.3 显示电路的设计 ..............................................................................11
2.4 语言提示电路的设计 .............................................................................11
2.4.1 ISD 芯片简介....................................................................................11
2.4.2 ISD1420 芯片特点及引脚介绍........................................................13
2.4.3 分段录音和放音简介 ......................................................................15
2.4.4 存储芯片 AT24C02 简介 ................................................................16
2.4.5 ISD1420 与单片机连接电路的设计................................................17
2.5 本章小结 .................................................................................................18
第 3 章 元件设计部分 ......................................................................................19
3.1 相应子程序设计 .....................................................................................19
3.1.1 按键扫描子程序设计 ......................................................................19
3.1.2 门铃键子程序设计 ..........................................................................20
3.2 录音和播放程序设计 .............................................................................22
3.2.1 RECORD 键是录主人留言信息控制键..........................................22
3.2.2 PIAY 键是播放留言控制键.............................................................22
3.3 本章小结 .................................................................................................22
第 4 章 调试 ......................................................................................................23
