【单选题】【消耗次数：1】
若要某系统的8253的2通道输出波形为占空比1:1的方波、分频系数为1000、二进制计数，其工作方式命令字为( )。
①
A6H
②
B6H
③
B4H
④
C7H
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相关题目
【简答题】
设(70H)=60H,(60H)=20H,P1为输入口，状态为0B7H,执行如下程序：MOV R0,#70H MOV A,@R0 MOV R1,A MOV B,@R1 MOV @R0,P1 。问R0、A、R1、B和70H中的数据是多少？
【单选题】
指令ADDC A，@R0 执行前（A）=38H，（R0）=30H，（30H）=FOH，（C）=1 执行后，其结果为（ ）。
①
（A）=92H （C）=1
②
（A）=92H （C）=0
③
（A）=8CH （C）=1
④
（A）=8CH （C）=0
【单选题】
设物理地址(10FF0H)=10H,(10FF1H)=20H，(10FF2H)=30H，从地址10FF1H中取出一个字的内容是
①
1020H
②
3020H
③
2030H
④
2010H
【单选题】
指令ADD A，R0 执行前（A）=38H，（R0）=54H，（C）=1 执行后，其结果为（ ）。
①
（A）=86H
②
（A）=20H
③
（A）=18H
④
（A）=00H
【单选题】
十六进制数（3FC3H）转换为相应的二进制数是____。
①
11111111000011B
②
01111111000011B
③
01111111000001B
④
11111111000001B
随机题目
【单选题】
Students with _______ problems may apply for student loans.
①
economic
②
financial
③
male
④
economical
【单选题】
James Fraser ____ tradition by using three actual American Indians as models for his creation.
①
went out
②
went for
③
went in
④
went against
【单选题】
Many manufacturers were accused of concentrating too heavily on cost reduction, often at the ____ of the quality of their products.
①
expense
②
exposure
③
expansion
④
expectation
【单选题】
The manager promised to keep me ____ of how our business was going on.
①
to be informed
②
on informing
③
informed
④
informing
【单选题】
I’m very sorry to have ____ you with so many questions on such an occasion.
①
interfered
②
offended
③
impressed
④
bothered
【单选题】
If we say some food is ____, we mean it is safe to eat.
①
ideal
②
editable
③
ideate
④
edible
【单选题】
Most people came to realize that it was about time the government ____ further measures to control the population.
①
must take
②
is taking
③
takes
④
took
【单选题】
He always has a lot of _______ ideas in his mind , and sometimes we do not even know what he is thinking about.
①
novel
②
spoil
③
acceptable
④
additional
【单选题】
Her skin was dry after ____ to the wind during the trip.
①
failure
②
disclosure
③
exposure
④
pressure