单片机键盘可调时钟 显示.doc

目录 前言··························································································································2 任务书······················································································································3· 1.方案选择 1.1.键盘设计············································································································4 1.2.门电路设计·········································································································5 1.3.显示电路·············································································································5 2.硬件电路及参考程序 2.1基于proteus仿真的硬件电路···········································································7 2.2参考程序·············································································································8 3试验调试 3.1 硬件电路的连接·······························································································14 3.2.硬件电路的调试································································································14 4试验结论···········································································································14 5心得体会···········································································································15 6参考文献及元器件引脚图 6.1参考文献···········································································································20 6.2 元器件引脚图····································································································21 6.3 AT89C51的若干时序·······················································································23 6.4硬件电路图·········································································································24 6.5元器件清单·········································································································26 前 言 随着时代科技的迅猛发展，微电子学和计算机等现代电子技术的成就给传统的电子测量与仪器带来了巨大的冲击和革命性的影响。常规的测试仪器仪表和控制装置被更先进的智能仪器所取代，使得传统的电子测量仪器在远离、功能、精度及自动化水平定方面发生了