[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fsMRh2C6NnCncWhjNo8LDHvh2b_swJW8QV8dJnQwQqZ8":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":21,"type":22},[],"2023-11-25 15:54:09",108466065,[8,9,10,11],"数据输入口","数据的输出口","准双向输入\u002F输出口","高8位地址总线",{"courseId":13,"courseImg":14,"courseName":15},"44d46dca581882f9f42dd57c63f789d7","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fde1039184a0155359e8de3da7e69b497.jpg","单片机原理及接口技术","当MCS-51单片机扩展了外部存储器时,P2口应作为 ( )",[18,23,32,41,50,59,67,76,85,94],{"answer":19,"createTime":5,"id":6,"options":20,"question":16,"source":21,"type":22},[],[8,9,10,11],"v1",0,{"answer":24,"createTime":5,"id":25,"options":26,"question":31,"source":21,"type":22},[],108466071,[27,28,29,30],"ADC0809","DAC0832","8255A","EPROM 2764","下列具有模数转换功能的芯片是( )",{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":21,"type":22},[],108466077,[36,37,38,39],"ALE","EOC","CLOCK","START","ADC0809的启动转换的信号是( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":21,"type":22},[],108466081,[45,46,47,48],"看其芯片型号是RAM还是ROM","看其读信号是\u002FRD还是\u002FPSEN","看其位于地址范围的低端还是高端","看其离MCS-51芯片的远近","区分片外程序存储器和片外数据存储器的最可靠方法是( )",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":21,"type":22},[],108466085,[54,55,56,57],"11","12","13","14","在8051片外扩展8K的EPROM 2764 ,需要使用( )根地址线",{"answer":60,"createTime":5,"id":61,"options":62,"question":66,"source":21,"type":22},[],108466090,[63,64,65,36],"\u002FRD","\u002FWR","\u002FPSEN","访问片外数据存储器时,以下不起作用的信号是( )",{"answer":68,"createTime":5,"id":69,"options":70,"question":75,"source":21,"type":22},[],108466095,[71,72,73,74],"P0口和P2口","P0口","P2口和P3口","P2口","MSC-51系列单片机外扩存储器芯片时,4个I\u002FO口中用作数据总线的是( )",{"answer":77,"createTime":5,"id":78,"options":79,"question":84,"source":21,"type":22},[],108466098,[80,81,82,83],"静态","动态","动态和静态","查询","在单片机应用系统中,LED的( )显示方式编程简单,但占用I\u002FO端口线多,一般适用显示位数较少的场合",{"answer":86,"createTime":5,"id":87,"options":88,"question":93,"source":21,"type":22},[],108466103,[89,90,91,92],"将各位数码管的段选线并联(同序号引脚连在一起)","用一个8位I\u002FO端口控制各位数码管的段选线","将各位数码管的位选线直接接在+5V或GND","将各位数码管的位选线用各自独立的I\u002FO端口控制","LED数码管若采用动态显示方式,下列说法错误的是( )",{"answer":95,"createTime":5,"id":96,"options":97,"question":102,"source":21,"type":22},[],108466107,[98,99,100,101],"8、8","8、9","8、16","1、8","ADC0809芯片是m路模拟输入的n位A\u002FD转换器,m、n分别是( )"]