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《单片机与接口技术》B

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一、填空题（一空一分，共29分） 1、十进制数92用二进制和8421BCD 码分别表示为和。 2、MCS-51单片机在读取扩展程序存储器单元时信号有效，在读取扩展数据存储器单元时信号有效。 3、设RAM 中(2456H)=66H ，(2457H)=34H ，ROM 中(2456H)=55H ，(2457H)=64H 。请分析下面程序执行后各寄存器的内容。（A ）=___ __，（DPTR ）=_ __。 MOV A ，#1 MOV DPTR ，#2456H MOVC A ，@A+DPTR 4、AT89S51单片机的1个机器周期含有个晶振周期或状态周期。 5、对于51单片机，当CPU 响应某中断请求时，将会自动转向相应中断入口地址去执行，外部中断0入口地址为： H ，SCON 入口地址为: H 。 6、PC 存放_____ _,在8051中决定程序执行顺序的是 (PC 还是DPTR ？),它是____ __位, （是，不是）SFR ？ 7、MCS-51单片机的P0~P4口均是 I/O 口，其中的P0口和P2口除了可以进行数据的输入、输出外，通常还用来构建系统的和。 8、组成32M ×8位的存储器，需要2M ×4位的存储芯片片。 9、下列各条指令其源操作数的寻址方式是什么？各条指令单独执行后，A 中的结果是什么？设（60H ）=21H ，（A ）=19H ，（30H ）=0FH 。（1）MOV A ，#48H ；寻址方式：（A ）= （2）ADD A ，60H ；寻址方式：（A ）= 10、8086的CPU 内部硬件结构框图被分为EU 和BIU 两大部分，其中___________负责CPU 外部的总线访问，___________负责指令的运行。 11、AT89C52 单片机有________个中断源，________级中断优先级别。 12、8255A 属于可编程的________I/O 接口芯片。

13、当MCS-51引脚信号有效时,表示从Po 口稳定地送出了低8位地址.

14、AT89C52单片机串行口波特率可以由定时器的溢出率决定。

二、选择（每小题只有一个答案是正确的，把答案写在括号内，每

题1.5分，共21分）

1、AT89S51单片机中既可位寻址又可字节寻址的单元是（）

A）20H B）30H C）00H D）70H

2、8031单片机的( )口的引脚，还具有外中断、串行通信等第二功能。

A）P0 B）P1 C）P2 D）P3

3、AT89C52 CPU是（）位的单片机

A） 16 B）4 C）8 D）准16

4、.MCS-51单片机复位操作的主要功能是把PC初始化为( )。

A）0100H B）2080H C）0000H D）8000H 5、8086系统中，存储单元的20位物理地址的形成方法是（）

A）20位地址＝段地址× 16 ＋偏移地址

B）20位地址＝段地址＋偏移地址× 4

C）20位地址＝段地址＋偏移地址× 16

D）20位地址＝段地址× 4 ＋偏移地址

6、MCS-51单片机在同一优先级的中断源同时申请中断时，CPU首先响应( )。

A）串行口中断 B）外部中断1

C）定时器0中断 D）定时器1中断

7、MCS-51单片机的堆栈区应建立在（）。

A）片内数据存储区的低128字节单元 B）片内数据存储区

C）片内数据存储区的高128字节单元 D）程序存储区

8、在串行通信中， AT89C52中发送和接收的寄存器是( ) 。

A）TMOD B）SBUF C）SCON D）DPTR

9、对程序存储器的读操作，只能使用（）

A)MOV指令 B）PUSH指令 C）MOVX指令 D）MOVC指令

10、在8051中，能够让程序在单片机外部扩展ROM中地址0000H～0FFFH空间中运行

的条件是（）

A）EA引脚接高电平B）EA引脚接低电平

C）PSEN引脚接高电平D）PSEN引脚接低电平

11、存储器的地址范围是0000H~0FFFH，它的容量为（）。

A）1KB B) 2KB C) 3KB D) 4KB

12、MOVX A , @R0指令中，源操作数采用（）寻址方式，指令作用在（）区间。

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A ）寄存器，外部数据存储器

B ）直接，程序存储器

C ）寄存器间接，内部数据存储器

D ）寄存器间接，外部数据存储器 13、不属于单片机与输入输出设备进行信息交换的方式是（）。 A) 无条件传送方式 B) 查询方式 C) DMA 方式 D)中断方式 14、下面哪条指令产生WR 信号( ) A ） MOVX @DPTR,A B ）MOVC A,@A+PC C ） MOVC A,@A+DPTR D ）MOVX A,@DPTR 三、编程题（50分） 1、单片机控制4个共阴数码管，上电后，数码管显示“3210”，当每按一次按键，数码管显示数字加一。

1、数码管显示

2、按键—外部中断0

3、 BCD 转换

2、AT89C52单片机P3.4口上连接了一个发光二级管，I/O口输出为0时，发光二极管亮，输出为1时，发光二级管灭。编程完成以下内容：发光二级管亮1秒，灭1秒，交替进行。要求用定时器实现定时，单片机外接晶振频率为24MHz。

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3、电路如下图所示。编程使D/A 转换器输出一个电压幅度为3V 的正向锯齿波波形，频率不限，D/A 转换的电压与数字量关系如图中公式所示。D/A 的器件地址请根据地址译码器自行计算。

4、单片机与PC机进行通信，PC发送字符给单片机，单片机接收到字符后，对接收到的“F”字符计数，计数满20个以后，向PC发送字符“K”，通信速率为4800BPS，单片机外接晶振频率为11.0592MHz。

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附录：

常用寄存器及数码管码表说明： TMOD TCON IE SCON PSW PCON

共阴码表： 0 1 2 3 4 5 6 7 8 9 （8段数码管）3fH 06H 5bH 4fH 66H 6dH 7Dh 07H 7fH 6fH

IT0 IE0 IT1 IE1 TR0 TF0 TR1 TF1 M0 M1 GA TE M0 MI T C / GA TE T C / EX0 ET0 EX1 ET1 ES ET2 EA RI TI RB8 TB8 REN SM2 SM1 SM0 P TI OV RS0 RS1 — AC CY SMO D D

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支部名称：填表时间：2014年月日民主评议会情况：2014年月日，应到会党员名，实到会党员名；应到会群众代表名，实到会群众代表名；实际到会总人数注：（此表由上级督导组汇总统计，一式三份，经党支部盖章、党（工）委审核盖章后，一份返回党支部，一份由党（工）委保存，一份报县委组织部。党（工）委（盖章） 2014年月日

（工）委保存，一份县委组织部和县委“活动办”存档）

限期改正党员登记表基层党组织名称：填报日期：2014年月日注：此表由党（工）委填写，一式两份，一份所在支部存档，一份上级党（工）委存档。

劝退、除名和取消预备党员资格登记表基层党支部（盖章）：填报日期：2014年月日注：此表由党（工）委填写，一式三份，经县委组织部和县委“活动办”审核盖章后，一份所在支部存档，一份上级党（工）委存档，一份县委组织部和县委“活动办”存档。

限期改正通知书同志：经党内外民主测评，党组织调查、审定，在2014年度党的群众路线教育实践活动专题组织生活会上，经过民主评议，你被评定为“差”党员。根据有关规定，结合你本人的表现和要求，党（工）委决定对你作出限期改正的处理。限期改正时间为（原则上半年）（从2014年月日至年月日）。希望你今后能正确对待党内外的批评，自觉接受党组织的教育，增强党性锻炼，争取做一名合格的共产党员。限期改正到期后，你要主动向党支部提出重新评议的申请，汇报自己的思想、工作表现，接受组织的审查。党（工）委 2014年月日

同志：经党内外民主测评，党组织调查、审定，在2014年度党的群众路线教育实践活动专题组织生活会上，经过民主评议，你被评定为“差”党员。根据有关规定，结合你本人的表现和要求，党（工）委决定对你作出劝退的处理。若有不同意见，可于收到本通知书的30日内向上级党组织反馈。党（工）委 2014年月日

2014年至2015年高等学校英语应用能力考试A级B级真题及答案

?2014年6月A级考试实考卷 ?Part I Listening Comprehension (15 minutes) Directions:This part is to test your listening ability. It consists of 3 sections. Section A Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. Both the dialogues and questions will be spoken only once. When you hear a question, you should decide on the correct answer from the 4 choices marked A), B), C) and D) given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center. 1. A) A testing system. B) A monitor system. C) A measuring system. D) A control system. 2. A) Car prices. B) Car services. C) The company’s business. D) The company’s culture. 3. A) It’s easy to do. B) It’s challenging. C) He can get a high pay. D) He did the same job before.. 4. A) She’ll meet a friend. B) She will take a flight. C) She will attend an interview at 5 o’clock. D) She will see a doctor before 5 o’clock. 5. A) She will report the complaint to the manager. B) The manager refused to talk to the man. C) The manager was on a business trip. D) She will deal with the complaint. Section B Directions: This section is to test your ability to understand short conversations. There are 2 recorded conversations in it. After each conversation, there are some recorded questions. Both the conversations and questions will be spoken two times. When you hear a question, you should decide on the correct answer from the 4 choices marked A), B), C) and D) given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center. Conversation One 6.A) Breakfast. B) Dinner. C) A 5-dollar gift card. D) Bus service to the airport. 7. A) His member card. B) His driven license. C) His credit card. D) His passport. Conversation 2 8.A) The telephone is out of order. B) The line is busy.