目 录
第一章 绪 论 ...............................................................................................................1
1.1 概述 ......................................................................................................................1
1.2 研究目的、内容及思路 .......................................................................................2
第二章 1-WIRE 总线技术 .......................................................................................3
2.1 1-WIRE 规范的通信协议 ......................................................................................3
2.2 1-WIRE 协议体系结构模型 ..................................................................................3
2.2.1 1-Wire 物理层协议........................................................................................4
2.2.2 复位和存在时序 ............................................................................................5
2.2.3 写时序 ............................................................................................................5
2.2.4 读时序 ............................................................................................................5
2.2.5 1-Wire 链路层协议........................................................................................6
2.3 本章小结 ...............................................................................................................6
第三章 数字温度传感器 DS18B20 ....................................................................7
3.1 单总线数字温度计 DS18B20 简介......................................................................7
3.2 DS18B20 的原理...................................................................................................7
3.2.1 DS18B20 的特性 ...........................................................................................8
3.2.2 DS18B20 引脚及功能 ...................................................................................9
3.2.3 DS18B20 的工作原理 ...................................................................................9
3.2.4 存储器操作命令代码及其含义 ..................................................................10
3.3 温度检测系统原理及软件流程图 .....................................................................11
3.4 本章小结...............................................................................................................12
第四章 串行通信和 RS-232-C ...........................................................................13
4.1 数据的串行通信...................................................................................................13
4.2 有关串行通信的物理标准...................................................................................14
4.3 RS-232-C 标准....................................................................................................14
4.4 RS232C 串口通信接线方法（三线制）...........................................................15
4.5 本章小结 ..............................................................................................................16
第五章 硬件设计 ......................................................................................................17
5.1 设计指标及总体设计 .........................................................................................17
5.2 单片机 STC89C51 ..............................................................................................18
5.2.1 电平转换电路 ..............................................................................................21
5.2.2 复位电路 ......................................................................................................21
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