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15问答网 > 4、在PC机中读写8253计数器的计数值利用的I⼀O地址有＿＿ A、40H B、41H C、42H D、43H E、61H

4、在PC机中读写8253计数器的计数值利用的I⼀O地址有＿＿ A、40H B、41H C、42H D、43H E、61H

2025-03-15 23:03:42

推荐回答（2个）

回答1：

答案为：40H、41H、42H、43H
在PC中一片8253需要占用4个端口地址，通常这4个端口地址是连续的。

回答2：

若是将计数初值写入8253通道0，I/O地址是40H；
若是将计数初值写入8253通道1，I/O地址是41H；
若是将计数初值写入8253通道2，I/O地址是42H；

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