| 摘要 |
PURPOSE:To decide an array of keys for every key telephone according to the preference of each subscriber, by writing previously the desired data into a storing circuit and then reading the data in accordance with a key operation. CONSTITUTION:A central processing circuit 100 controls an FF200, switches the outputs of the 1st and 2nd selecting circuits 202 and 204 to the side of an address bus 201 and writes the desired data into storing circuits 203 and 205. After this, the FF200 is controlled and the outputs of the circuits 202 and 204 are switched to the side of a latching circuit 102 and a binary encoder 108 respectively. Now if either one of the 1st-3rd keys 109-111 is pushed by a subscriber, a binary code corresponding to the pushed key is delivered from a binary encoder 108 and applied to the address input of the 2nd storing circuit 205 via the 2nd selecting circuit 204. Thus the data written previously is read out to the output of the circuit 205 and then taken into the circuit 100 through a gate circuit 107. |
