8086微处理器接到HOLD请求信号后,发出响应信号HLDA是在()
A.T4或Ti之后的下一总线周期T1上升沿
B.T4或Ti之后的下一总线周期T1下降沿
C.T4或Ti的上升沿
D.T4或Ti的下降沿
正确答案是B
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