Compteur modulo 24
Un article de Wikipedia.
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{| align="center" border="1" cellpadding="5" cellspacing="0" | {| align="center" border="1" cellpadding="5" cellspacing="0" | ||
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- | !Q<sub>d</sub>Q<sub>c</sub> | + | !Q<sub>f</sub>Q<sub>e</sub>Q<sub>d</sub>\Q<sub>c</sub>Q<sub>b</sub>Q<sub>a</sub>!!000!!001!!011!!010!!110!!111!!101!!100 |
|- | |- | ||
- | ! | + | !000 |
- | |align="center"|0||align="center"|1||align="center"|3||align="center"|2 | + | |align="center"|0||align="center"|1||align="center"|3||align="center"|2||align="center"|6||align="center"|7||align="center"|5||align="center"|4 |
|- | |- | ||
- | ! | + | !001 |
- | |align="center"| | + | |align="center"|8||align="center"|9||align="center"|-||align="center"|-||align="center"|-||align="center"|-||align="center"|-||align="center"|- |
|- | |- | ||
- | ! | + | !011 |
- | |align="center"|-||align="center"|-||align="center"|-||align="center"|- | + | |align="center"|24||align="center"|25||align="center"|-||align="center"|-||align="center"|-||align="center"|-||align="center"|-||align="center"|- |
|- | |- | ||
- | ! | + | !010 |
- | |align="center"|8||align="center"|9||align="center"|-||align="center"|- | + | |align="center"|16||align="center"|17||align="center"|19||align="center"|18||align="center"|22||align="center"|23||align="center"|21||align="center"|20 |
+ | |- | ||
+ | !110 | ||
+ | |align="center"|-||align="center"|-||align="center"|-||align="center"|-||align="center"|-||align="center"|-||align="center"|-||align="center"|- | ||
+ | |- | ||
+ | !111 | ||
+ | |align="center"|8||align="center"|9||align="center"|-||align="center"|-||align="center"|2||align="center"|2||align="center"|2||align="center"|2 | ||
+ | |- | ||
+ | !101 | ||
+ | |align="center"|8||align="center"|9||align="center"|-||align="center"|-||align="center"|2||align="center"|2||align="center"|2||align="center"|2 | ||
+ | |- | ||
+ | !101 | ||
+ | |align="center"|8||align="center"|9||align="center"|-||align="center"|-||align="center"|2||align="center"|2||align="center"|2||align="center"|2 | ||
|} | |} | ||
Version du 9 mars 2009 à 12:09
Sommaire |
Compteur modulo 24
But
Déterminer les composants logiques d'un compteur modulo 24.
Introduction
Voir le compteur modulo 16.
Compteur modulo 24
Un compteur modulo 24 utilise aussi 6 bascules JK.
Etats du compteur
En se basant sur les informations du compteur modulo 16, les états deviennent les suivants :
Etat | Q | Q+ | f | e | d | c | b | a | ||||||||||||||||
f | e | d | c | b | a | f | e | d | c | b | a | J | K | J | K | J | K | J | K | J | K | J | K | |
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | x | 0 | x | 0 | x | 0 | x | 0 | x | 1 | x |
1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | x | 0 | x | 0 | x | 0 | x | 1 | x | x | 0 |
2 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | x | 0 | x | 0 | x | 0 | x | x | 0 | 1 | x |
3 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | x | 0 | x | 0 | x | 1 | x | x | 1 | x | 1 |
4 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | x | 0 | x | 0 | x | x | 0 | 0 | x | 1 | x |
5 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | x | 0 | x | 0 | x | x | 0 | 1 | x | x | 1 |
6 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | x | 0 | x | 0 | x | x | 0 | x | 0 | 1 | x |
7 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | x | 0 | x | 1 | x | x | 1 | 1 | x | x | 1 |
8 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | x | 0 | x | 1 | x | 0 | x | 0 | x | 1 | x |
9 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | x | 1 | x | x | 1 | 0 | x | 0 | x | x | 1 |
10 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | x | x | 0 | 0 | x | 0 | x | 0 | x | 1 | x |
11 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | x | x | 0 | 0 | x | 0 | x | 1 | x | x | 1 |
12 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | x | x | 0 | 0 | x | 0 | x | x | 0 | 1 | x |
13 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | x | x | 0 | 0 | x | 1 | x | x | 1 | x | 1 |
14 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | x | x | 0 | 0 | x | x | 0 | 0 | x | 1 | x |
15 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | x | x | 0 | 0 | x | x | 0 | 1 | x | x | 1 |
16 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 1 | 0 | x | x | 0 | 0 | x | x | 0 | x | 0 | 1 | x |
17 | 0 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | x | x | 0 | 1 | x | x | 1 | x | 1 | x | 1 |
18 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | x | x | 0 | x | 0 | 0 | x | 0 | x | 1 | x |
19 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | x | x | 1 | x | 1 | 0 | x | 0 | x | x | 1 |
20 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | x | 0 | 0 | x | 0 | x | 0 | x | 0 | x | 1 | x |
21 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | x | 0 | 0 | x | 0 | x | 0 | x | 1 | x | x | 1 |
22 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | x | 1 | 0 | x | 0 | x | 0 | x | x | 0 | 1 | x |
23 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | x | 1 | 0 | x | 0 | x | 0 | x | x | 1 | x | 1 |
Matrice de référence
La matrice de référence des états du compteur :
QfQeQd\QcQbQa | 000 | 001 | 011 | 010 | 110 | 111 | 101 | 100 |
---|---|---|---|---|---|---|---|---|
000 | 0 | 1 | 3 | 2 | 6 | 7 | 5 | 4 |
001 | 8 | 9 | - | - | - | - | - | - |
011 | 24 | 25 | - | - | - | - | - | - |
010 | 16 | 17 | 19 | 18 | 22 | 23 | 21 | 20 |
110 | - | - | - | - | - | - | - | - |
111 | 8 | 9 | - | - | 2 | 2 | 2 | 2 |
101 | 8 | 9 | - | - | 2 | 2 | 2 | 2 |
101 | 8 | 9 | - | - | 2 | 2 | 2 | 2 |
Réduction des fonctions J et K
Par rapport au compteur modulo 16, seul Kd et Jb changent :
|
Ja = 1 |
|
Ka = 1 = Ja | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Jb = Qa/Qd |
| Kb = Qa | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Jc = QaQb |
| Kc = QaQb = Jc | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Jd = QaQbQc |
| Kd = Qa |