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专家您好：
请问F2801中，在程序中给TBCTR赋零与TBCTR计数到PRD值在掉到零，这两者之间有什么区别，哪一种是我们通常所说的零事件
谢谢
零事件指的是TBCTR计数到PRD值在掉到零
后者，楼主为何有此困惑？ 是对文档中的描述有异议么？能否贴出来看看？
