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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.
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OFD (Oscillation Frequency Detector)
The OFD is a Toshiba original frequency detector which detects abnormal oscillation at the hardware level. It is compliant with IEC 60730 standard. A frequency of an external oscillator is always measured with a reference clock and a reset is generated when the frequency goes out of a predetermined range. The OFD requires no software program to operate it, which is quite different from using a watch-dog timer. The latter has to be assigned with the highest priority interrupt and needs a subroutine to detect the frequency of the oscillator. The OFD has more features. No external reference clocks are necessary, detected frequencies are selected with register values, and the detection time is as small as 100us min. to reset the microcontroller when the oscillator runs abnormally.
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