20电子时钟设计目录一、课程设计要求及目的........................................................................2二、开发环境及设备................................................................................21、设计环境............................................................................................................................22、设计所用设备....................................................................................................................2三、设计思想与原理................................................................................21、设计思想............................................................................................................................22、设计原理............................................................................................................................31、内容....................................................................................................................................32、要求....................................................................................................................................33、设计环境............................................................................................................................44、设计所用设备....................................................................................................................4三、设计所用芯片结构............................................................................41、8259A芯片的内部结构及引脚..........................................................................................42、8255芯片的内部结构及引脚............................................................................................53、8255端口地址....................................................................................................................64、8254芯片的内部结构及引脚............................................................................................65、8254引脚图如图3示，各引脚功能如下。....................................................................7四、具体模块设计....................................................................................81、概述....................................................................................................................................82、主程序模块........................................................................................................................83、小键盘模块........................................................................................................................94、显示模块..........................................................................................................................105、定时模块..........................................................................................................................106、中断处理模块..................................................................................................................107、芯片引脚...........................................................................................................................11五、程序流程图......................................................................................121、主程序流程图如图6所示...................................................................
