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[单选题]
如果需要计数一定值以后，OUT由原来的低电平变为高电平，则8253应工作于（ ） A.方式0计数结束中断方式
A
方式2速率发生器方式
B
方式3方波方式
C
方式4软件触发选通方式
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参考答案
试题答案：
A
答案解释：
方式0下，当计数单元计至零时，OUT信号由低变高。其余方式OUT都是由高变低。
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