[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fxw3de_DnpPW4sYwYlJ8riDZJ9w-g2DhfcEWKTnm1LSU":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-12-17 23:31:12",270833244,[8,9,10,11],"20H-2FH","08H-0FH","00H-1FH","00H-07H",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},27,"1ff49415f9c812faed863e8418924350","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F10900a78da598961cc57d2de16f5e1bb.PNG","单片机","work_49205115","23机械2第4次作业","8051单片机内部RAM中,可作为工作寄存器区的字节地址范围是( )",[21,32,41,50,59,68,71,80,89,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],270833239,[25,26,27,28],"存储数据","指示程序计数器","控制中断","指示堆栈顶部","AT89S51单片机的堆栈指针SP的作用是( )","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],270833240,[36,37,38,39],"串行口中断请求","电平方式的外部中断请求","定时器溢出中断请求","跳沿方式的外部中断请求","在 AT89S51的中断请求源中,需要外加电路实现中断撤销的是( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],270833241,[45,46,47,48],"下降沿触发","低电平有效","上升沿触发","高电平有效","单片机的复位信号通常是( )",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],270833242,[54,55,56,57],"P0","P3","P2","P1","AT89S51单片机的IO口中,____口没有内部上拉电阻",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],270833243,[63,64,65,66],"4 32","2 32","2 16","4 16","液晶显示模块LCD1602,每次显示 行,每行可显示______ 个字符.( )",{"answer":69,"createTime":5,"id":6,"options":70,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],270833245,[75,76,77,78],"方式0","方式2","方式1","方式3","帧格式为1个起始位,8个数据和1个停止位的异步串行通信方式是方式( )",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],270833246,[84,85,86,87],"16 40","16 20","8 40","8 20","AT89S51单片机具有 位的CPU,一般采用 个引脚的DIP封装方式.( )",{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":30,"type":31},[],270833247,[93,94,95,96],"程序状态字寄存器 PSW","A. 程序计数器PC","寄存器 B","数据指针DPTR","以下哪个不是AT89S51单片机的特殊功能寄存器?( )",{"answer":99,"createTime":5,"id":100,"options":101,"question":102,"source":30,"type":31},[],270833248,[75,76,78,77],"用AT89S51单片机的串行口扩展并行I\u002FO口时,串行口应该选择( )"]