题目内容

已知 8254 计数器 0 的端口地址为 40H，控制字寄存器的端口地址为 43H，计数时钟频率为2MHz，利用这一通道设计当计数到0时发出中断请求信号，其程序段如下，则中断请求信号的周期是 ms。MOV AL, 00110010BOUT 43H, ALMOV AL, 0FFHOUT 40H, ALOUT 40H, AL

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