20春学期《微控制器接口技术》在线平时作业3

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<span style="FONT-FAMILY: 宋体">执行返回指令后返回的断点是<span lang="EN-US"><o:p></o:p></span></span>
A:<span style="FONT-FAMILY: 宋体">调用指令的首地址</span>
B:调用指令的末地址
C:<span class="GramE"><span style="FONT-FAMILY: 宋体">调用指令的下一条指令的首地址</span></span>
D:<span style="FONT-FAMILY: 宋体">返回指令的末地址<span lang="EN-US"><o:p></o:p></span></span>

若（A）=8FH,(R0)=F8H,（C）=0, <div align="left">执行<span>ADDC&nbsp;A,R0指令后,正确结果是(&nbsp;)</span></div>
A:(A)= 87H,(C)=1
B:(A)= 87H,(C)=0 <o:p></o:p>
C:(A)= 8FH,(C)=1
D:(A)= 8FH,(C)=0<o:p></o:p>

<span style="FONT-FAMILY: 宋体">在寄存器间接寻址方式中，指定寄存器中存放的是（）<span lang="EN-US"><o:p></o:p></span></span>
A:<span style="FONT-FAMILY: 宋体">操作数</span>
B:<span style="FONT-FAMILY: 宋体">操作数地址</span>
C:<span style="FONT-FAMILY: 宋体">转移地址</span>
D:<span style="FONT-FAMILY: 宋体">地址偏移量<span lang="EN-US"><o:p></o:p></span></span>

<span style="FONT-FAMILY: 宋体">控制定时<span lang="EN-US">/</span>计数器工作方式的寄存器是<span lang="EN-US">( )<o:p></o:p></span></span>
A:TCON<span style="mso-spacerun: yes">&nbsp;</span>
B:PCON
C:TMOD
D:SCON<o:p></o:p>

<span style="FONT-FAMILY: 宋体">下列关于中断优先控制的论述中错误的是（）<span lang="EN-US"><o:p></o:p></span></span>
A:<span style="FONT-FAMILY: 宋体">低优先级不能中断高优先级，但相反却可以<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;</span></span></span>
B:<span style="FONT-FAMILY: 宋体">同级中断不能嵌套<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;</span></span></span>
C:<span style="FONT-FAMILY: 宋体">同级中断请求按时间的先后顺序相应</span>
D:<span style="FONT-FAMILY: 宋体">同一时刻同级多中断请求，系统无法响应<span lang="EN-US"><o:p></o:p></span></span>

<span style="FONT-FAMILY: 宋体">以下哪个属于前向通道器件（）</span><span lang="EN-US"><o:p></o:p></span>
A:<span lang="EN-US">A/D</span>
B:<span lang="EN-US">D/A</span>
C:<span lang="EN-US">LED</span>
D:继电器<span lang="EN-US"><o:p></o:p></span>

MOVX A,@DPTR指令中源操作数的寻址方式是<span>(&nbsp;)</span>
A:<span style="FONT-FAMILY: 宋体">寄存器寻址</span>
B:寄存器间接寻址
C:直接寻址
D:立即寻址

<span style="FONT-FAMILY: 宋体">定时器的计数长度设定为<span lang="EN-US">16</span>位时，其工作方式是（<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp; </span></span>）<span lang="EN-US"><o:p></o:p></span></span>
A:<span style="FONT-FAMILY: 宋体">方式<span lang="EN-US">0</span></span>
B:方式<span lang="EN-US">l</span>
C:方式<span lang="EN-US">2<span style="mso-spacerun: yes">&nbsp;</span></span>
D:方式<span lang="EN-US">3<o:p></o:p></span>

<span style="FONT-FAMILY: 宋体">在中断服务程序中至少应有一条（）<span lang="EN-US"><o:p></o:p></span></span>
A:<span style="FONT-FAMILY: 宋体">传送指令</span>
B:转移指令
C:加法指令
D:中断返回指令

<span style="FONT-FAMILY: 宋体">串行口允许接收的条件是<span lang="EN-US"><o:p></o:p></span></span>
A:SM2=1<span style="mso-spacerun: yes">&nbsp;</span>
B:REN=<st1:chmetcnv style="BACKGROUND-POSITION: left bottom; BACKGROUND-IMAGE: url(res://ietag.dll/#34/#1001); BACKGROUND-REPEAT: repeat-x" tabindex="" w:st="on" unitname="C" sourcevalue="1" hasspace="True" negative="False" numbertype="1" tcsc="0">1</st1:chmetcnv>
C:RI=1

在下列控制信号中，不是给程序存贮器扩展使用的是（<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp; </span></span>）
A:/PSEN<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>
B:<span lang="EN-US">/EA<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>
C:<span lang="EN-US">ALE<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>
D:<span lang="EN-US">/WR<o:p></o:p></span>

<span lang="EN-US">4</span>个<span lang="EN-US">I</span>／<span lang="EN-US">O</span>口中有<span lang="EN-US">1</span>个<span class="GramE">口具有</span>第<span lang="EN-US">2</span>功能，它是（ ）
A:P0<span style="FONT-FAMILY: 宋体">口</span>
B:P1口
C:P2口
D:P3口

<span style="FONT-FAMILY: 宋体">下列指令中不是变址寻址方式的是（）<span lang="EN-US"><o:p></o:p></span></span>
A:JMP&nbsp;@A+DPTR
B:MOVC&nbsp;A,@A+DPTR
C:MOVC&nbsp;&nbsp;&nbsp; A,@A+PC
D:MOVX&nbsp;&nbsp; A,@DPTR

<span style="FONT-FAMILY: 宋体"><font face="宋体">在下列所列特点中，不属于串行工作方式2的是（）</font></span>
A:11<span style="FONT-FAMILY: 宋体">位帧格式</span>
B:由第<span lang="EN-US">9</span>位数据<span lang="EN-US"><o:p></o:p></span>
C:<span style="FONT-FAMILY: 宋体">只有<span lang="EN-US">1</span>种波特率</span>
D:两种波特率可选<span lang="EN-US"><o:p></o:p></span>

必须进行十进制调整的十进制运算是（ ）
A:<span class="GramE"><span style="FONT-FAMILY: 宋体">加法和减法</span></span>
B:<span style="FONT-FAMILY: 宋体">乘法和除法</span>
C:<span style="FONT-FAMILY: 宋体">只有加法</span>
D:<span style="FONT-FAMILY: 宋体">只有减法<span lang="EN-US"><o:p></o:p></span></span>

中断技术是一种资源共享是解决资源竞争的有效方法<span lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

<st1:chmetcnv style="BACKGROUND-POSITION: left bottom; BACKGROUND-IMAGE: url(res://ietag.dll/#34/#1001); BACKGROUND-REPEAT: repeat-x" tabindex="" w:st="on" unitname="C" sourcevalue="89" hasspace="False" negative="False" numbertype="1" tcsc="0"><span lang="EN-US">89C</span></st1:chmetcnv><span lang="EN-US">51</span>单片机没有<span lang="EN-US">I<st1:chmetcnv style="BACKGROUND-POSITION: left bottom; BACKGROUND-IMAGE: url(res://ietag.dll/#34/#1001); BACKGROUND-REPEAT: repeat-x" tabindex="" w:st="on" unitname="C" sourcevalue="2" hasspace="False" negative="False" numbertype="1" tcsc="0">2C</st1:chmetcnv></span>接口，只能靠软件模拟<span lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

定时器在工作时占用<span lang="EN-US">CPU</span><span style="FONT-FAMILY: 宋体">时间</span><span lang="EN-US"><o:p></o:p></span>
A:错误
B:正确

P3<span style="FONT-FAMILY: 宋体">口在使用时，第二功能优先，空闲的口线可用作<span lang="EN-US">I/O</span>口先使用<span lang="EN-US"><o:p></o:p></span></span>
A:错误
B:正确

<span style="FONT-FAMILY: 宋体">连续重复执行的算法可用循环程序编写<span lang="EN-US"><o:p></o:p></span></span>
A:错误
B:正确