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Systèmes élec. & informatiques (MESISI120424)

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Soit le sketch ci dessous:

Que vaut la distance (en mm) entre l'obstacle et et le capteur ultrason de distance HSR04

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Le circuit intégrés 74 HC4051:

choisir le ou les affirmations correctes:

         

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

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on peut générer un signal PWM sur la broche:

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

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

The 74HC/HCT393 are 4-bit binary ripple counters with separate clocks (1CP and 2 CP) and master reset (1MR and 2MR) inputs to each counter. The operation of each half of the "393" is the same as the "93" except no external

clock connections are required.

The counters are triggered by a HIGH-to-LOW transition of the clock inputs. The counter outputs are internally connected to provide clock inputs to succeeding stages.

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Le circuit intégrés 74 HC4051:

choisir le ou les affirmations correctes:

         

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74HC74, quelle est l'affirmation fausse ?

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

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