下载后可任意编辑目录摘要..................................................................................................................................................2Abstract.............................................................................................................................................31.实习任务与要求...........................................................................................................................41.1 实习目的.............................................................................................................................41.2 实习任务.............................................................................................................................41.3 实习要求.............................................................................................................................52．基本原理....................................................................................................................................62.1 数字时钟基本原理.............................................................................................................62.2 温度计工作基本原理.........................................................................................................62.3 频率计工作基本原理.........................................................................................................63．方案论证....................................................................................................................................73.1 键盘显示接口部分.............................................................................................................73.2 温度计部分.........................................................................................................................74．硬件设计....................................................................................................................................94.1 最小系统设计................
