某一8253通道,CLK输入频率1000Hz,工作于方式3(方波方式),写入的计数初值为16H,且采用BCD计数方式,则一个周期内输出信号的高电平和低电平分别为( )
A.8,8(ms)
B.11,11(ms)
C.16,16(ms)
D.22,22(ms)
正确答案是A
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