Importance

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Abstract

In a timer apparatus, the clock controlling circuit thereof outputs a clock signal during a period in which an input signal is significant. The counter thereof counts the number of pulses of the clock signal to generate a count-up signal when the value of count reaches a prescribed value. The initialization circuit thereof outputs an initialization signal when the input is not significant. The clock controlling circuit stops the output of the clock signal when the count-up signal is generated. Thereby, it is prevented to misjudge the detection of an effective pulse width to achieve the effective pulse width though the pulse width of the pulse does not actually reach the effective pulse width actually.

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First Claim