| 摘要 |
PURPOSE:To simplify the interface circuit of a control part, by integrating signal lines from an operating part to the control part. CONSTITUTION:When command keys K1-K5 of the operating part 1 are operated, signals having frequencies proper to the command keys K1-K5 are transmitted to the control part 2, and the detecting means of the control part 2 detects the frequency of the signal at every prescribed period, and outputs it to a discriminating means. The discriminating means discriminates the frequency of the signal to which command key it corresponds, and inputs the fact that a discriminated command key is operated in a memory means. The operation of the command key is inputted to a transient memory means, and also, control corresponding to the command key is executed by the control part 2. In this way, it is possible to remarkably reduce the number of lead wires connecting the operating part and the control part, and the number of pins of connectors, and to simplify the interface circuit of the control part. |
