【单选题】【消耗次数：1】
8051单片机的定时器T1用作定时方式时是____。
①
由内部时钟频率定时，一个时钟周期加1
②
由内部时钟频率定时，一个机器周期加1
③
由外部时钟频率定时，一个时钟周期加1
④
由外部时钟频率定时，一个机器周期加1
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相关题目
【单选题】
8051单片机的定时器T1用作定时方式时是。
①
由内部时钟频率定时，一个时钟周期加1
②
由内部时钟频率定时，一个机器周期加1
③
由外部时钟频率定时，一个时钟周期加1
④
由外部时钟频率定时，一个机器周期加1
【单选题】
8051单片机的定时器T1用作计数方式时计数脉冲是。
①
由内部时钟频率定时，一个时钟周期加1
②
由外部计数脉冲计数，一个机器周期加1
③
外部定时脉冲由T0（P3.4）输入定时
④
由内部时钟频率计数，一个机器周期加1
【简答题】
某总线在一个总线周期中并行传送4个字节的数据，假设一个总线周期等于一个总线时钟周期，总线时钟频率为33MHz，则总线带宽是多少?
【单选题】
8051单片机的定时器T0用作计数方式时是____。
①
由内部时钟频率定时，一个时钟周期加1
②
由内部时钟频率定时，一个机器周期加1
③
由外部计数脉冲计数，下降沿加1
④
由外部计数脉冲计数，一个机器周期加1
【单选题】
8051单片机的定时器T1用作计数方式时计数脉冲是。
①
外部计数脉冲由T1（P3.5）输入
②
外部计数脉冲由内部时钟频率提供
③
外部计数脉冲由T0（P3.4）输入
④
由附加的外部脉冲计数器来计数
【简答题】
指令周期、机器周期与时钟周期的关系。
随机题目
【单选题】
The electric fan does not work because of the ____ of service.
①
pause
②
break
③
interruption
④
breakdown
【单选题】
It is ____ to fly an airplane at three thousand miles an hour.
①
possible
②
likely
③
maybe
④
probable
【单选题】
The eldest child is thoroughly ____ because they
always give him whatever he wants.
①
wasted
②
spoiled
③
destroyed
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uneducated
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When she saw the clouds, she went back to the house to
____ her umbrella.
①
bring
②
fetch
③
take
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carry
【单选题】
The new cut in interest rate ____ promote domestic investment.
①
means to
②
directs toward
③
is meant to
④
leads to
【单选题】
—__________fine day it is today!—Yes, the sunshine is__________beautiful that Id like to go swimming in the sea.
①
How, such
②
What a, very
③
How, so
④
What a, so
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By cutting down trees we ____ the natural home of birds and animals.
①
harm
②
hurt
③
injure
④
damage
【单选题】
Nowadays, many people suffer from _________ depression under the pressure of working.
①
acute
②
sharp
③
quick
④
cute
【单选题】
Something must have happened on their way. Or they_____
by now.
①
should have arrived
②
should arrive
③
would have arrived
④
would arrive
【单选题】
The treasury issued an order stating that ____ land purchased from the government had to be paid for in gold and silver.
①
henceforth
②
moreover
③
whereby
④
however