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Systèmes élec. & informatiques (MESISI120424)

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Une bascule D synchrone (flip-flop):

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Un Démupltiplexeur est un circuit qui réalise

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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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On peut récupérer la tension moyenne du signal PWM:

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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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La fréquence de l'oscillateur interne de la carte Aduino Uno est de

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À quelle broche du microcontrôleur doit être connectée la broche "Trig" du capteur HC-SR04 pour déclencher l'émission d'ultrasons 

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Le PWM est utile

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Int outPin = 9 ;

void setup() {

pinMode(outPin, OUTPUT);

}

void loop() {

digitalWrite(outPin, HIGH);

delay(300);

digitalWrite(outPin, LOW);

delay(200);

}

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Le circuit intégrés 74 HC4051:

choisir le ou les affirmations correctes:

         

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