【单选题】【消耗次数:1】
MCS-51有中断源(  )。
5个
2个
3个
6个
参考答案:
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相关题目
【判断题】 51单片机有5个中断源,2个外部中断,3个内部中断。
①  正确
②  错误
【判断题】 51单片机有5个中断源,这5个中断源的优先级相同。
①  正确
②  错误
【单选题】 MCS-51响应中断时,下面哪一个条件不是必须的()。
①  当前指令执行完毕
②  中断是开放的
③  没有同级或高级中断服务
④  必须有RETI指令
【单选题】 MCS-51单片机内部的有____个全双工的串行口。
①  1个
②  2个
③  3个
④  4个
【判断题】 MCS-51单片机内部有2个32位的定时计数器。
①  正确
②  错误
【单选题】 MCS-51单片机的中断源个数和中断优先级个数分别是( )。
①  5、2
②  5、3
③  6、2
④  6、3
【单选题】 MCS-51单片机可分为两个优先级别。各中断源的优先级别设定是利用寄存器()。
①  IE
②  IP
③  TCON
④  SCON
【简答题】 简述MCS-51的中断响应过程
【单选题】 在MCS-51系统中,若晶振频率是6MHz,一个机器周期等于()μs。
①  1
②  23
③  3
④  0.5
【单选题】 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( )。
①  外部中断0
②  外部中断1
③  定时器0中断
④  定时器1中断
随机题目
【单选题】 “Where do you live?” I live ____ 550 Dalian Road.”
①  on
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【单选题】 You’re ____ your time trying to persuade him. He’ll never join us. ?
①  spending ?
②  wasting ?
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④  missing?
【单选题】 The boy lost his ____when he stepped on the icy road.
①  way
②  weight
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【单选题】 Never in my life ____ or seen such a thing.
①  I have heard of
②  I had heard of
③  have I heard of
④  did I hear of
【单选题】 —I’m sorry to keep you waiting. —Oh, not at all. I___ here only a few minutes.
①  have been
②  had been
③  was
④  will be
【单选题】 The bus is late and Julie is cold. She____ for the bus for 10 minutes.
①  waits
②  waited
③  has been waiting
④  has waited
【单选题】 Put it down, Richard. You mustnt read ____ letter.
①  anyones elses
②  anyones else
③  anyone elses
④  anyone else
【单选题】 ____ the English examination, I would have gone to the concert last Sunday.
①  In spite of
②  But for
③  Because of
④  As for
【单选题】 Every society has its own peculiar customs and____ of acting.
①  attitudes
②  behavior
③  ways
④  means
【单选题】 “She is from Shanghai, ____ population is larger than that of any other city inChina.”
①  its
②  which
③  whose
④  that