【摘要】 为了实现计算机局域网中系统时间的统一,利用AT89C51单片机设计了基于ISA总线的GPS时钟板卡,一台计算机读取GPS时钟板卡的时间信息并在局域网中广播发送.为了降低成本和提高性能,此设计为一种嵌入式单片机系统———GPS网络时钟,它由GPS时钟板卡、网卡、以AT89C51为核心具有ISA总线的主板组成.文中给出了硬件原理图及系统测试过程.更多还原

【Abstract】 In order to get standard time in the local area network, GPS clock card based on ISA bus is designed by taking advantage of AT89C 51.A computer readouts time information of GPS clock card, broadcasts and sends it in local area network. In order to deline costs and advance qualities, a kind of infixed single chip computer system--GPS network clock is designed. It is made up of GPS clock card,network card,main plate which is with AT89C51 at the core and posesses ISA bus. Basic circuit of hardware and testing process of system are given.更多还原