基于 51 单片机的病床呼叫系统 目 录摘要.................................................................................................................................................................2Abstract...........................................................................................................................................................2引言.................................................................................................................................................................21 系统方案设计.............................................................................................................................................31.1 系统整体方案设计.........................................................................................................................31.2 主控制器的选择.............................................................................................................................31.3 显示模块的选择.............................................................................................................................31.4 报警模块的选择.............................................................................................................................41.5 无线通信的选择.............................................................................................................................42 硬件设计.....................................................................................................................................................42.1 单片机最小系统设计.....................................................................................................................42.1.1 概述.............................................................................................................................................42.1.2 晶振电路....................................................................................................................
