| 摘要 |
PURPOSE:To reduce the load of a control section, by transmitting the the synchronism of specified processing in response to an interruption permissible state from the control section, after once keeping the change in a status signal, at a data communication. CONSTITUTION:Circuits 9, 11 detecting the change in a status signal S transmitted from a line terminating, device a circuit 12 storing its detection signal, and circuits 13-15 discriminating the timing for informing the storage signal to a control section, are provided. When the discriminating circuit is instructed with the permission of interruption with a signal (a) from the control section, the respective stored signal is informed to the control section in the bit processing period and when the discriminating circuit is not instructed with the permission of interruption with the signal (a), each holding signal is informed to the control section in the character processing sysnchronism. |
