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Systèmes élec. & informatiques (MESISI120424)

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Ce code permet de générer un signal PWM dont le rapport cyclique en % est de: ( donner la valeur numerique  en %)

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74HC393, quelle(es) affirmation (s) est vraie (s)?

The master resets are active-HIGH asynchronous inputs to each 4-bit counter identified by the "1" and "2" in the pin description.

A HIGH level on the nMR input overrides the clock and sets the outputs LOW.

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Pour réaliser un compteur qui compte jusqu'à 7 et recommence

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Comment peut-on utiliser le composant 74HC393 pour compter jusqu'à 255?

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La tension moyenne d'un signal PWM ayant un rapport cyclique de 20% et une amplitude Vcc=10V est:

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74HC74, quelle affirmation est fausse ?

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Soit le circuit suivant:

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74HC393, quelle(es) affirmation (s) est vraie (s)?

The master resets are active-HIGH asynchronous inputs to each 4-bit counter identified by the "1" and "2" in the pin description.

A HIGH level on the nMR input overrides the clock and sets the outputs LOW.

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Comment peut-on limiter le compteur 74HC393 à compter uniquement de 0 à 3, puis le faire recommencer automatiquement ?

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74HC74, quelle est l'affirmation fausse ?

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