单片机课件_单片机_其他_其他下载-pudn.com

<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/62fb47a85425817ffc52fa92/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/62fb47a85425817ffc52fa92/bg1.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0">MCS-51 单片机试题及答案（1） </div><div class="t m0 x1 h3 y3 ff2 fs0 fc0 sc1 ls0 ws0">试题 </div><div class="t m0 x1 h3 y4 ff2 fs0 fc0 sc1 ls0 ws0">一、填空题（每空 1 分，共 10 分）</div><div class="t m0 x1 h3 y5 ff2 fs0 fc0 sc1 ls0 ws0">　　1.当使用 8031 单片机时，需要</div><div class="t m0 x1 h3 y6 ff2 fs0 fc0 sc1 ls0 ws0">扩展外部程序存储器，此时 EA 应为</div><div class="t m0 x1 h3 y7 ff1 fs0 fc0 sc0 ls0 ws0">_低电平</div><div class="t m0 x1 h3 y8 ff2 fs0 fc0 sc1 ls0 ws0">　　2.P0 通常用作(单片机系统的地</div><div class="t m0 x1 h3 y9 ff2 fs0 fc0 sc1 ls0 ws0">址或者数据总线)</div><div class="t m0 x1 h3 ya ff2 fs0 fc0 sc1 ls0 ws0">　 　 3. 若 由 程 序 设 定</div><div class="t m0 x1 h3 yb ff1 fs0 fc0 sc0 ls0 ws0">RS1、RS0=10，则工作寄存器 R0～</div><div class="t m0 x1 h3 yc ff1 fs0 fc0 sc0 ls0 ws0">R7 的直接地址为 10H-17H</div><div class="t m0 x1 h3 yd ff2 fs0 fc0 sc1 ls0 ws0">　　4.返回地址（或断点）是_（在</div><div class="t m0 x1 h3 ye ff2 fs0 fc0 sc1 ls0 ws0">程序中断或子程序调用时）的程序</div><div class="t m0 x1 h3 yf ff2 fs0 fc0 sc1 ls0 ws0">计数器的内容。</div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div> </body> </html>

<div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/62fb47a85425817ffc52fa92/bg2.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff2 fs0 fc0 sc1 ls0 ws0">　　5.中央处理器 CPU 是单片机的</div><div class="t m0 x1 h3 y3 ff2 fs0 fc0 sc1 ls0 ws0">核心，它完成（运算和控制功能）</div><div class="t m0 x1 h3 y4 ff2 fs0 fc0 sc1 ls0 ws0">　　6.单片机的工作过程，实际上就</div><div class="t m0 x1 h3 y5 ff2 fs0 fc0 sc1 ls0 ws0">是（周而复始地取指令和执行指令</div><div class="t m0 x1 h3 y6 ff2 fs0 fc0 sc1 ls0 ws0">的过程）</div><div class="t m0 x1 h3 y7 ff2 fs0 fc0 sc1 ls0 ws0">　　7.所谓中断源即是（引起中断的</div><div class="t m0 x1 h3 y8 ff2 fs0 fc0 sc1 ls0 ws0">原因）</div><div class="t m0 x1 h3 y9 ff2 fs0 fc0 sc1 ls0 ws0">　　8.端口（或称口）是（接口电路</div><div class="t m0 x1 h3 ya ff2 fs0 fc0 sc1 ls0 ws0">中已编址并能进行读或写操作的寄</div><div class="t m0 x1 h3 yb ff2 fs0 fc0 sc1 ls0 ws0">存器）</div><div class="t m0 x1 h3 yc ff2 fs0 fc0 sc1 ls0 ws0">　　9.异步串行近程通信时的传送信</div><div class="t m0 x1 h3 yd ff2 fs0 fc0 sc1 ls0 ws0">号是（TTL 电平信号）</div><div class="t m0 x1 h3 ye ff2 fs0 fc0 sc1 ls0 ws0">　 　 10. 若 累 加 器 A 中 的 数 据 为</div><div class="t m0 x1 h3 yf ff1 fs0 fc0 sc0 ls0 ws0">01110010B，则 PSW 中的 P=（0）</div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div>

<div id="pf3" class="pf w0 h0" data-page-no="3"><div class="pc pc3 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/62fb47a85425817ffc52fa92/bg3.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff2 fs0 fc0 sc1 ls0 ws0">　　二、单项选择题（在每小题的</div><div class="t m0 x1 h3 y3 ff2 fs0 fc0 sc1 ls0 ws0">四个备选答案中，选出一个正确答</div><div class="t m0 x1 h3 y4 ff2 fs0 fc0 sc1 ls0 ws0">案，并将正确答案的序填在题干的</div><div class="t m0 x1 h3 y5 ff2 fs0 fc0 sc1 ls0 ws0">括号内。每小题 1 分，共 10 分）</div><div class="t m0 x1 h3 y6 ff2 fs0 fc0 sc1 ls0 ws0">　　1.MCS—51 单片机的复位信号</div><div class="t m0 x1 h3 y7 ff2 fs0 fc0 sc1 ls0 ws0">是（A）有效。</div><div class="t m0 x1 h3 y8 ff2 fs0 fc0 sc1 ls0 ws0">　　A.高电平 B.低电平 C.脉冲 D.下</div><div class="t m0 x1 h3 y9 ff2 fs0 fc0 sc1 ls0 ws0">降沿</div><div class="t m0 x1 h3 ya ff2 fs0 fc0 sc1 ls0 ws0">　　2.若 MCS-51 单片机使用晶振频</div><div class="t m0 x1 h3 yb ff2 fs0 fc0 sc1 ls0 ws0">率为 6MHz 时，其复位持续时间应</div><div class="t m0 x1 h3 yc ff2 fs0 fc0 sc1 ls0 ws0">该超过（B ）。</div><div class="t m0 x1 h3 y10 ff2 fs0 fc0 sc1 ls0 ws0">　　A.2μs B.4μs C.8μs D.1ms</div><div class="t m0 x1 h3 y11 ff2 fs0 fc0 sc1 ls0 ws0">　　3.若 PSW.4=0，PSW.3=1，要想</div><div class="t m0 x1 h3 y12 ff2 fs0 fc0 sc1 ls0 ws0">把寄存器 R0 的内容入栈，应使用</div><div class="t m0 x1 h3 y13 ff2 fs0 fc0 sc1 ls0 ws0">（D）指令。</div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div>

<div id="pf4" class="pf w0 h0" data-page-no="4"><div class="pc pc4 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/62fb47a85425817ffc52fa92/bg4.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y14 ff2 fs0 fc0 sc1 ls0 ws0">　　A.PUSH R0 B.PUSH @R0</div><div class="t m0 x1 h3 y15 ff2 fs0 fc0 sc1 ls0 ws0">　　C.PUSH 00H D.PUSH 08H</div><div class="t m0 x1 h3 y16 ff2 fs0 fc0 sc1 ls0 ws0">　　4.能够用紫外光擦除 ROM 中程</div><div class="t m0 x1 h3 y17 ff2 fs0 fc0 sc1 ls0 ws0">序的只读存储器称为（C ）。</div><div class="t m0 x1 h3 y18 ff2 fs0 fc0 sc1 ls0 ws0">　 　 A. 掩 膜 ROM B.PROM</div><div class="t m0 x1 h4 y19 ff1 fs0 fc0 sc0 ls0 ws0">C.EPROM D.EEPROM</div><div class="t m0 x1 h3 y7 ff2 fs0 fc0 sc1 ls0 ws0">　　5.在片外扩展一片 2764 程序存</div><div class="t m0 x1 h3 y8 ff2 fs0 fc0 sc1 ls0 ws0">储器芯片要（B）地址线。</div><div class="t m0 x1 h3 y9 ff2 fs0 fc0 sc1 ls0 ws0">　　A.8 根 B.13 根 C.16 根 D.20 根</div><div class="t m0 x1 h3 ya ff2 fs0 fc0 sc1 ls0 ws0">　　6.定时器/计数器工作方式 1 是</div><div class="t m0 x1 h3 yb ff2 fs0 fc0 sc1 ls0 ws0">（D）。</div><div class="t m0 x1 h3 yc ff2 fs0 fc0 sc1 ls0 ws0">　　A.8 位计数器结构 B.2 个 8 位计</div><div class="t m0 x1 h3 yd ff2 fs0 fc0 sc1 ls0 ws0">数器结构</div><div class="t m0 x1 h3 ye ff2 fs0 fc0 sc1 ls0 ws0">　　C.13 位计数结构 D.16 位计数结</div><div class="t m0 x1 h3 yf ff2 fs0 fc0 sc1 ls0 ws0">构</div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div>

<div id="pf5" class="pf w0 h0" data-page-no="5"><div class="pc pc5 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/62fb47a85425817ffc52fa92/bg5.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff2 fs0 fc0 sc1 ls0 ws0">　　7.设 MCS-51 单片机晶振频率为</div><div class="t m0 x1 h3 y3 ff1 fs0 fc0 sc0 ls0 ws0">12MHz，定时器作计数器使用时，</div><div class="t m0 x1 h3 y4 ff2 fs0 fc0 sc1 ls0 ws0">其最高的输入计数频应为（C）</div><div class="t m0 x1 h3 y1a ff2 fs0 fc0 sc1 ls0 ws0">　 　 A.2MHz B.1MHz C.500KHz</div><div class="t m0 x1 h4 y1b ff1 fs0 fc0 sc0 ls0 ws0">D.250KHz</div><div class="t m0 x1 h3 y1c ff2 fs0 fc0 sc1 ls0 ws0">　　8.已知 1 只共阴极 LED 显示器，</div><div class="t m0 x1 h3 y1d ff2 fs0 fc0 sc1 ls0 ws0">其中 a 笔段为字形代码的最低位，若</div><div class="t m0 x1 h3 y1e ff2 fs0 fc0 sc1 ls0 ws0">需 显 示 数 字 1 ， 它 字 形 代 码 应 为</div><div class="t m0 x1 h3 y1f ff2 fs0 fc0 sc1 ls0 ws0">（A）。</div><div class="t m0 x1 h3 y20 ff2 fs0 fc0 sc1 ls0 ws0">　　A.06H B.F9H C.30H D.CFH</div><div class="t m0 x1 h3 yb ff2 fs0 fc0 sc1 ls0 ws0">　　9. 下列数据字定义的数表中，</div><div class="t m0 x1 h3 yc ff2 fs0 fc0 sc1 ls0 ws0">（C）是错误的。</div><div class="t m0 x1 h3 y21 ff2 fs0 fc0 sc1 ls0 ws0">　　A.DW“AA” B.DW“A”</div><div class="t m0 x1 h3 y22 ff2 fs0 fc0 sc1 ls0 ws0">　　C.DW“OABC” D.DWOABCH</div><div class="t m0 x1 h3 y23 ff2 fs0 fc0 sc1 ls0 ws0">　　10.串行口的控制寄存器 SCON</div><div class="t m0 x1 h3 y24 ff2 fs0 fc0 sc1 ls0 ws0">中，REN 的作用是（C）。</div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div>