练习3(第4章)

第四章思考与练习

（一）课本部分

见教材P128-129。

（二）补充部分

一、是非题

8．多个中断源不可以同时申请中断。（）

9．CPU 在响应INT0 中断时，其中断申请标志IE0 用软件清除是多余的。（）10．串行口的发送中断与接收中断各自有自己的中断入口地址。（）

11．波特率反映了串行通讯的速率。（）

12．只要中断允许寄存器IE 中的EA=1 ，那么中断请求就一定能够得到响应。（）13．中断服务程序执行的最后一条指令必须是RETI 。（）

14．在微机的输入/ 输出方式中，中断请求方式比查询方式的效率高。（）

15．执行LCALL 指令时，栈指针SP 的内容不会发生变化。（）

16.外部数据存储器的读指令为MOVC。（）

17.8051单片机串行中断只有一个，但有2个标志位。（）

二、选择题

6．对8031 而言，可作为普通I/O 口使用的是：（）

①P0 、P2 口②P1 、P3 口③P0 、P1 、P2 、P3 口

7．下面那一段程序能准确地读取P1 口引脚信号：（）

①MOV A ，#00H ；MOV P1，A ；MOV A，P1

②MOV A ，#0FFH ；MOV P1 ，A ；MOV A ，P1

③MOV A ，#0FFH ；MOV A ，P1

④MOV A ，#0FFH ；MOV A ，P1

8．MCS — 51 单片机的四个并行I/O 中，其驱动能力最强的是：（）

①P0 口②P1 口③P2 口④P3 口

9．定时器/ 计数器工作于模式2 ，在计数溢出时：（）

①计数从零重新开始②计数从初值重新开始③计数停止

10．T0 设置成计数方式时，外部引脚计数脉冲的最高频率应是晶振频率的：（）

①1/12 ②1/24 ③1/48

11．当晶振频率是12MHz 时，MCS — 51 单片机的机器周期是：（）

①1μs ②1ms ③2μs ④2ms

12．外部中断INT0 的触发方式控制位IT0 置1 后，其有效的中断触发信号是：（）

①高电平②低电平③上升沿④下降沿

13．按键的机械抖动时间参数通常是：（）

①0 ②5~10μs ③5~10ms ④1s 以上

14．N 位LED 显示器采用动态显示方式时，需要提供的I/O 线总数是：（）

①8+N ②8 × N ③N

15．一字节补码所表示的数值范围是：（）

①-128 ～+127 ②-127 ～+128 ③-128 ～+128

16. 定时器/计数器工作方式1是（）。

A.8位计数器结构

B.2个8位计数器结构

C.13位计数结构

D.16位计数结构

17.设MCS-51单片机晶振频率为12MHz，定时器作计数器使用时，其最高的输入计数频率

应为（）(1) 1us, (2) 2us, (3)3us, (4)4us

18. 串行口的控制寄存器SCON中，REN的作用是（）。

A.接收中断请求标志位

B.发送中断请求标志位

C.串行口允许接收位

D.地址/数据位

三程序设计

已知晶振频率为12MH Z ，请用T0 的工作模式 1 定时及溢出中断方式编程，实现从P1.0 引脚输出周期为10ms的方波。要求先确定定时时间并给出定时初值的计算步骤，然后写程序。

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