目 录1 引言............................................................................................................................................11.1 国旗自动升降系统中国外进展情况...............................................................................11.2 选题目标和意义................................................................................................................22 整体设计方案和理论分析...........................................................................................................32.1 系统装置理论分析...........................................................................................................32.2 电机选择能够有两种方案...............................................................................................32.3 电机驱动选择方案...........................................................................................................42.4 语音部分方案选择和论证...............................................................................................42.5 单片机选择方案...............................................................................................................52.6 LCD 显示选择方案............................................................................................................52.7 按键选择方案...................................................................................................................63 系统硬件设计............................................................................................................................73.1 STC89C52 单片机及相关电路..........................................................................................73.1.1STC89C52 单片机概述............................................................................................73.1.2 晶振电路................................................................................................................93.1.3 复位电路............................................
