摘要本文设计了自动打铃系统的硬件电路和软件程序。自动打铃系统以单片机AT89C51为微处理器,DS12887为时钟芯片,8279为键盘显示接口芯片,实现了自动打铃,系统可以根据需要通过键盘调整打铃的时间,通过6位数码管显示当前的时间。文中给出了硬件电路图和软件程序,并对部分程序设计给出了程序框图。自动打铃系统电路简单,功能齐全。关键词:自动打铃系统;单片机AT89C51;DS12887;8279AbstractThisarticledesignedhashitthebellsystem',DS12887istheclockchip,8279forthekeyboarddemonstrationconnectionchip,realizedhashitthebellautomatically,ordingtoneedtohitbell'stimethroughthekeyboardadjustment,,,:Hitsthebellsystemautomatically;MonolithicintegratedcircuitAT89C51;DS12887;8279目录第1章绪论........................................................................................................................................................................................................................................................................................................3第2章设计任务及要求..........................................................................................................................................................................................................................................................................................................4第3章系统方案设计..................................................................................................6第4章系统硬件电路设计.......................................................................................................................................................................................................................................................................................................................................................................
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