题目内容

Mr Black has a lot of friends and is very popular at parties. He is very good 1telling interesting stories and those stories often make people 2 . Everyone enjoys listening to him. Mr Black has a 3. Her name’s Kelly. She is only four4old and she can’t understand all the stories. A few days ago, one of Mr Black’s friends asked him5some stories at a birthday party. Mr Black agreed 6because he loved to do so. On that day Mr Black went to the birthday 7with his daughter. At the party he told many interesting stories. The people there laughed a lot and gave thanks to him for the great joy. Mr Black was very 8. When he finished the talk, Kelly told him she wanted to leave. Mr Black was a little surprised 9he did as his daughter asked. On their way home, he asked Kelly 10 she enjoyed the stories.“No, I didn’t. I didn’t like to see so many people laughing at you.”

查看答案
更多问题

采用 80C51 的定时器 T0 定时,用模式 2,则应 ______。21

A. 启动 T0 前先向 TH0置入计数初值,TL0置 0,以后每次重新计数前都要重新置入计数初值
B. 启动 T0 前先向 TH0、TL0 置入计数初值,以后每次重新计数前都要重新置入计数初值
C. 启动 T0 前先向 TH0、TL0置入计数初值,以后不再置入
D. 启动 T0 前先向 TH0、TL0置入相同的计数初值,以后不再置入

80C51单片机定时器 T0 的溢出标志 TF0,当计数满产生溢出时,其值为 ______。

A. 0
B. 0xff
C. 1
D. 计数值

80C51的定时器 T1 用作计数方式时, _____。

A. 外部计数脉冲由 T1(P3.5引脚 )输入
B. 外部计数脉冲由内部时钟频率提供
C. 外部计数脉冲由 T0(P3.4 引脚 )输入
D. 外部计数脉冲由 P0 口任意引脚输入

80C51单片机的 TMOD 模式控制寄存器,其中 GATE位表示的是 ______。

A. 门控位
B. 工作方式定义位
C. 时 /计数功能选择位
D. 运行控制位

答案查题题库