可编程定时计数器计数波形的实时观测与研究

To Observe Counting Waves of Programmable Interval Timer and Research

应用查询或中断控制技术实时观测 82 53可编程定时计数器的各种计数波形 .实验结果表明 :82 53计数器的计数频率可数倍于 2 .5MHz,并且在计数模式 3下的奇分频系数必须大于等于 5才有效 .本实验为提高 82

Applying polling or interrupt control technique, to observe the counting waves of 8253 programmable interval timer. The experiment results showed that counting frequency of 8253 PIT may many times higher than 2 5 MHz and odd counting value must be large or equal 5 valid in counting mode 3. The experiment results provide reliable experiment data to increase utilizable of 8253 PIT.