OFD(振荡频率检测器)

OFD(振荡频率检测器)

OFD是东芝原创的频率检测器,在硬件层面检测异常振荡。它符合IEC 60730标准。外部振荡器的频率将始终通过参考时钟来测量,当频率超出预定范围时将产生复位。OFD不需要软件程序来操作,这与使用看门狗定时器大不相同。后者必须分配最高优先级的中断,并且需要一个子程序来检测振荡器的频率。OFD具有更多的功能特性,无需外部参考时钟,可使用寄存器值选择检测频率,检测时间最小为100us,当振荡器运行异常时,将复位微控制器。

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采用振荡频率检测器的微控制器产品如下。

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