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Systèmes élec. & informatiques (MESISI120424)

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The 74HC74 is dual positive edge triggered D-type flip-flop. They have individual data (nD), clock (nCP), set (nSD) and reset (nRD) inputs, and complementary nQ and nQ outputs. Data at the nD-input, that meets the set-up and hold time requirements on the LOW-to-HIGH clock transition, is stored in the flip-flop and appears at the nQ output.

Quelle affirmation est fausse?

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74HC74, quelle est l'affirmation fausse ?

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

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Le circuit ci-dessous est alimenté avec un signal PWM (e(t) est un signal PWM) on peut récupérer la tension moyenne du signal :

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

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

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int outPin = 9 ;

void setup() {

pinMode(outPin, OUTPUT);

}

void loop() {

digitalWrite(outPin, HIGH);

delay(50);

digitalWrite(outPin, LOW);

delay(200);

}

Le rapport cyclique en %:

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