注意:使用一个ONDTR功能块的最好方式就是,每次描从-一个特别的基准地址调用一次。每次扫描不要从一个特别的基准地址调用ONDTR多于–次(否则会导致不适当的计时结果)。当一个ONDTR出现在–个程序块中,每次扫描就累计一次时间。相同扫描期内后来调用该程序块将对ONDTR没有影响。不要在两个不同子程序中编入带相同的基准地址的ONDTR功能块。不应该编–个围绕定时器功能的跳转的程序。
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