| 摘要 |
PURPOSE:To decrease the cost and to make the time control easy, by controlling the operation of an informing means for generating confirming sound of a key in synchronizing with an interruption processing with a prescribed period. CONSTITUTION:A means which resets a timer after discriminating whether or not a key on a keybaord is operated and whether or not an informing means is in operation, and a means by which the operation of the informing means is stopped when the informing means is in operation, are provided. Every time an interruption signal from a timer 61 is given, an interruption processing of a prescribed period discriminating the presence/absence of key operation is constituted and the operation of an informing means 21 generating the confirming sound of the key is controlled in synchronizing with the interruption processing. Thus, the circuit constitution as the hardware can be made easy and the time management as the software can easily be performed. |
