【摘要】 针对在PC机和单片机频繁通信的情况下,传统的主机轮询从机的方式占用大量的CPU时间,效率低,实时性和可靠性很差的缺陷,介绍一种串行通信的新方法——基于编码器74LS148的优先级判定法,实现了PC与单片机一对多通信,有效的解决了办公电话多路控制的问题。实际应用证明,该设计可靠,稳定性好。更多还原

【Abstract】 Single-chip in the PC and frequent communication,the traditional host polling the way from the plane occupied by a large number of CPU time,low efficiency,poor real-time performance and reliability of the defects,this paper introduces a serial communication new method-based on the encoder 74LS148 to determine the priority of law,the realization of a PC with the single-chip one-to-many communications,effective multi-office telephone control.Practical application proved that the design of reliable and stable.更多还原