[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f0mOzaPPoMHtvTYUnNEHHmbHf-5VPu79_vuCOsx7pa_s":3},{"id":4,"source":5,"question":6,"options":7,"answer":12,"related":13,"type":24,"origin":102,"createTime":26},181932022,"v1","80C51的ALE线的作用是______",[8,9,10,11],"晶体振荡器接入","片外ROM读选通线","片内外存储器选择","地址锁存有效信号输出端",[],[14,27,37,44,54,64,74,83,92,96],{"id":15,"source":5,"question":16,"options":17,"answer":22,"related":23,"type":24,"origin":25,"createTime":26},181932014,"当8051单片机的RST引脚上出现持续______个机器周期以上的高电平时,系统复位",[18,19,20,21],"1","4","2","3",[],[],0,null,"2025-04-07T22:26:44+08:00",{"id":28,"source":5,"question":29,"options":30,"answer":35,"related":36,"type":24,"origin":25,"createTime":26},181932015,"单片机保持复位状态,P1、P2、P3口引脚的电平状态为______",[31,32,33,34],"低电平","随机不确定","高电平","高阻",[],[],{"id":38,"source":5,"question":39,"options":40,"answer":42,"related":43,"type":24,"origin":25,"createTime":26},181932016,"若RS1=1,RSO=1,选中的工作寄存器组是第______组",[20,41,18,21],"0",[],[],{"id":45,"source":5,"question":46,"options":47,"answer":52,"related":53,"type":24,"origin":25,"createTime":26},181932017,"若执行一段代码共耗时 1000 个机器周期即 1 毫秒,则该单片机应用系统的振荡脉冲频率为______MHz",[48,49,50,51],"6","12","11.0952","24",[],[],{"id":55,"source":5,"question":56,"options":57,"answer":62,"related":63,"type":24,"origin":25,"createTime":26},181932018,"单片机复位时,PC的内容自动变为______",[58,59,60,61],"0003H","0000H","0001H","0002H",[],[],{"id":65,"source":5,"question":66,"options":67,"answer":72,"related":73,"type":24,"origin":25,"createTime":26},181932019,"8051 单片机的______口的引脚,还具有外中断、串行通信等第二功能",[68,69,70,71],"P2","P1","P0","P3",[],[],{"id":75,"source":5,"question":76,"options":77,"answer":81,"related":82,"type":24,"origin":25,"createTime":26},181932020,"80C51单片机包含1个______位的CPU",[19,78,79,80],"8","32","16",[],[],{"id":84,"source":5,"question":85,"options":86,"answer":90,"related":91,"type":24,"origin":25,"createTime":26},181932021,"80C51的\u002FPSEN 线的作用是______",[87,88,9,89],"片外RAM读选通线","片内RAM读选通线","片内ROM读选通线",[],[],{"id":4,"source":5,"question":6,"options":93,"answer":94,"related":95,"type":24,"origin":25,"createTime":26},[8,9,10,11],[],[],{"id":97,"source":5,"question":98,"options":99,"answer":100,"related":101,"type":24,"origin":25,"createTime":26},181932023,"在80C51单片机的4个并行口中,能作为通用I\u002FO口和低8位地址总线的是______",[71,68,70,69],[],[],{"courseName":103,"courseImg":104,"workName":105,"workId":106,"count":107,"courseId":108},"单片机原理及接口技术","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb7b71e09b27c1821bada66f9b7a42fd2.png","2.2 C51单片机存储器及IO","work_41771826",16,"6b4a67d7b6c68c8d2cd5c979b0aaadbd"]