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F28027的cpu定时器0有什么用

我想使用定时器0来测量两个终端间时间间隔,我将定时器设为1分钟左右

TIMER_setPeriod(myTimer0, 4000000000);

然后在终端程序里写入指令,每次中断读取完定时器0的读数后就重新载入定时器0,重新计时

定时器的中断程序为空,

经测试,可以正常读取两个中断直接的时间间隔但是

大概运行一分钟后 整个程序运行不正常,请问这个问题与cpu定时器0的特性有关系吗