20春学期《微控制器接口技术》在线平时作业2

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在单片机应用系统中需双向传递信号的是（ ）<span lang="EN-US"><o:p></o:p></span>
A:<span style="FONT-FAMILY: 宋体">地址线</span>
B:<span style="FONT-FAMILY: 宋体">数据线<span lang="EN-US"><o:p></o:p></span></span>
C:<span style="FONT-FAMILY: 宋体">控制信号线</span>
D:<span style="FONT-FAMILY: 宋体">电源线<span lang="EN-US"><o:p></o:p></span></span>

<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">说<span lang="EN-US">P1-P3</span>口都是准双向口是因为（）<span lang="EN-US"><o:p></o:p></span></span>
A:<span style="FONT-FAMILY: 宋体">数据不能同时出进<span lang="EN-US"><o:p></o:p></span></span>
B:<span style="FONT-FAMILY: 宋体">做输入时先向口锁存器送<span lang="EN-US">1<o:p></o:p></span></span>

在<span lang="EN-US">MCS-51</span><span style="FONT-FAMILY: 宋体">系统扩展中，为实现</span><span lang="EN-US">P</span>_{<span lang="EN-US" style="FONT-FAMILY: 宋体">0</span>}<span style="FONT-FAMILY: 宋体">口线的数据和低位地址复用应使用</span><span lang="EN-US">(<span style="mso-spacerun: yes">&nbsp; </span>)</span><span lang="EN-US" style="FONT-FAMILY: 宋体"><o:p></o:p></span>
A:地址锁存器
B:地址寄存器
C:地址缓冲器<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;</span></span>
D:地址译码器

<span style="FONT-FAMILY: 宋体">存储器的每个单元都被赋予唯一的编号，称为（）<span lang="EN-US"><o:p></o:p></span></span>
A:<span style="FONT-FAMILY: 宋体">地址</span>
B:字节
C:列号
D:容量

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

<st1:chmetcnv style="BACKGROUND-POSITION: left bottom; BACKGROUND-IMAGE: url(res://ietag.dll/#34/#1001); BACKGROUND-REPEAT: repeat-x" tabindex="" unitname="C" sourcevalue="89" hasspace="False" negative="False" numbertype="1" tcsc="0" w:st="on">89C</st1:chmetcnv>51<span style="FONT-FAMILY: 宋体">是<span lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp; </span>)<o:p></o:p></span></span>
A:CPU
B:<span style="FONT-FAMILY: 宋体">微处理器</span>
C:单片微机
D:控制器

<span style="FONT-FAMILY: 宋体">在下列总线中，哪种需用导线最少（）<span lang="EN-US"><o:p></o:p></span></span>
A:SPI<span style="mso-spacerun: yes">&nbsp;</span>
B: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>
C:<span style="FONT-FAMILY: 宋体">并行通信</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

用<span lang="EN-US">8</span>位二进制补码所能表示的<span lang="EN-US">10</span>进制数范围是（ ）
A:-127<span style="FONT-FAMILY: 宋体">～<span lang="EN-US">+127</span></span>
B:-128～<span lang="EN-US">+<st1:chmetcnv style="BACKGROUND-POSITION: left bottom; BACKGROUND-IMAGE: url(res://ietag.dll/#34/#1001); BACKGROUND-REPEAT: repeat-x" tabindex="" unitname="C" sourcevalue="128" hasspace="True" negative="False" numbertype="1" tcsc="0" w:st="on">128</st1:chmetcnv></span>
C:-127～<span lang="EN-US">+128</span>
D:-128～<span lang="EN-US">+127<o:p></o:p></span>

若只扩展一片<span lang="EN-US">4K</span><span style="FONT-FAMILY: 宋体">的数据存储器（并行方式），除</span><span lang="EN-US">P0</span><span style="FONT-FAMILY: 宋体">口外还需</span><span lang="EN-US">P2</span><span style="FONT-FAMILY: 宋体">口的（）<span lang="EN-US"><o:p></o:p></span></span>
A:<span lang="EN-US">4</span>棵
B:<span lang="EN-US">5</span>棵
C:<span lang="EN-US">6</span>棵
D:<span lang="EN-US">7</span>棵

由于单片机<span lang="EN-US">PC</span><span style="FONT-FAMILY: 宋体">寄存器为</span><span lang="EN-US">16</span><span style="FONT-FAMILY: 宋体">位，<span class="GramE">故程序</span>存贮器空间可为（ ）<u><span lang="EN-US"><o:p></o:p></span></u></span>
A:4K
B:<span class="GramE">64K</span>
C:<span class="GramE">16K</span>
D:32K

下列指令中与进位标志<span lang="EN-US">CY</span><span style="FONT-FAMILY: 宋体">无关的是（）<span lang="EN-US"><o:p></o:p></span></span>
A:<span style="FONT-FAMILY: 宋体">移位指令</span>
B:位操作指令
C:传送指令
D:条件转移指令

<span style="FONT-FAMILY: 宋体">响应中断时要保护断点，自动将其内容压入堆栈的是（ ）<span lang="EN-US"><o:p></o:p></span></span>
A:DPTR
B:PSW
C:SP
D:PC

<span style="FONT-FAMILY: 宋体">对程序存贮器的读操作只能用 （ ）<span lang="EN-US"><o:p></o:p></span></span>
A:<span lang="EN-US">MOV</span><span style="FONT-FAMILY: 宋体">指令</span>
B:PUSH<span style="FONT-FAMILY: 宋体">指令</span>
C:MOVX<span style="FONT-FAMILY: 宋体">指令</span>
D:MOVC<span style="FONT-FAMILY: 宋体">指令<span lang="EN-US"><o:p></o:p></span></span>

程序计数器<span lang="EN-US">PC</span><span style="FONT-FAMILY: 宋体">不能为用户使用，因此它就没有地址<span lang="EN-US"><o:p></o:p></span></span>
A:错误
B:正确

PSW<span style="FONT-FAMILY: 宋体">寄存器的各个位都可以通过软件编程.<span lang="EN-US"><o:p></o:p></span></span>
A:错误
B:正确

<span class="GramE">门控位</span><span lang="EN-US">GATA=0</span><span style="FONT-FAMILY: 宋体">定时器的启动只由</span><span lang="EN-US">TR</span><span style="FONT-FAMILY: 宋体">位的状态决定<span lang="EN-US"><o:p></o:p></span></span>
A:错误
B:正确

<span class="GramE"><span style="FONT-FAMILY: 宋体">是读口锁存器</span></span><span style="FONT-FAMILY: 宋体">还是读引脚是由指令区分<span lang="EN-US"><o:p></o:p></span></span>
A:错误
B:正确

定时器<span lang="EN-US">T0</span><span style="FONT-FAMILY: 宋体">方式</span><span lang="EN-US">2</span><span style="FONT-FAMILY: 宋体">为自动回复初值，故初始化时只需将初值装入</span><span lang="EN-US">TL0</span><span lang="EN-US" style="FONT-FAMILY: 宋体"><o:p></o:p></span>
A:错误
B:正确