第一章 绪论.....................................................................................................................................21.1 概述.....................................................................................................................................21.2 课程设计任务.....................................................................................................................2第二章硬件系统设计.......................................................................................................................32.1 单片机最小系统.................................................................................................................32.1.1 STC89C52 的介绍.....................................................................................................32.1.2 stc89c52 系列单片机最小系统的介绍...................................................................42.2 矩阵键盘模块.....................................................................................................................52.3 数码管显示单元.................................................................................................................52.4 LCD1602 液晶显示电路......................................................................................................62.5 蜂鸣器单元.........................................................................................................................8第三章 软件设计..............................................................................................................................93.1 数码管实验.........................................................................................................................93.1.1 循环数码管显示 0—F 程序设计结构图：.............................................................93.1.2 59 秒倒计数流程图..............................................................................................103.2 矩阵键盘流程图..........
