详细说明：学习掌握单总线数字式温度传感器 DS18B20的64位激光ROM码的读出方法。读DS18B20 64位ROM码命令（33h）允许主机直接读出从机的64位ROM代码，而无须执行搜索ROM 过程。如果该命令用于多节点系统，则必然发生数据冲突，因为每个从机设备都会响应该命令。64 位激光ROM 从高位到低位依次由8 位CRC、48 位列号和8 位家族代码(28H)组成。--learning and mastering digital single bus DS18B20 64 laser ROM code to read out the side France. Reading DS18B20 64 orders ROM code (33h) allows mainfr a me directly read out from the plane of the 64 generation ROM code, and are not required to implement ROM search process. If the order for the multi-node system, the data was inevitable conflict, because each from the plane s equipment will respond to the order. 64 ROM laser from high to low followed by eight CRC, 48 ranks and eight family code (28H).