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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?
74HC74, quelle affirmation est fausse ?
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.
Pour réaliser un compteur qui compte jusqu'à 7 et recommence
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 externalclock 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.
74HC74, quelle affirmation est fausse ?
Quelle (es) affirmation (s) est (sont) vraie (s)?
Soit le sketch ci dessous:
Que vaut la distance (en mm) entre l'obstacle et et le capteur ultrason de distance HSR04
on peut générer un signal PWM sur la broche:
Comment peut-on limiter le compteur 74HC393 à compter uniquement de 0 à 3, puis le faire recommencer automatiquement ?