单选题在8255接口电路中,若A组和B组工作于方式1,且为输出口,控制线由高电平跳变为低电平的时刻为()。ACPU已送出一个数据到8255,输出缓冲器满B8255已把输出缓冲器内容送出外设C8255向CPU发中断请求时DCPU向8255输出缓冲器写新数据时
单选题
在8255接口电路中,若A组和B组工作于方式1,且为输出口,控制线由高电平跳变为低电平的时刻为()。
A
CPU已送出一个数据到8255,输出缓冲器满
B
8255已把输出缓冲器内容送出外设
C
8255向CPU发中断请求时
D
CPU向8255输出缓冲器写新数据时
参考解析
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