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6747定时中断问题

采用32位Unchained模式,定时源采用内部时钟,定时各个寄存器查看配置正常,但是无论配置中断周期多少,中断都是按照每秒7,8次中断。

查了一下是中断响应时间长,这是什么原因呢,即使中断程序什么也不做也不行