| 摘要 |
PURPOSE:To produce a prescribed interruption signal with simple constitution, by setting a time interval of the interruption signal to a specified value, through the comparison of an input signal with reference voltage at a comparison circuit and the application of the interruption signal to a processor with the input signal having the level of the reference voltage or more. CONSTITUTION:An input signal Sin is fed to a comparison circuit 10 and it is compared with reference voltage Vr. The input signal Sin having a prescribed level or more is wave-shaped to produce a wave shape type output signal (b). The signal (b) in wave shape is fed to a resistance 12 via a capacitor 11, the rising part of the signal (b) is differentiated to obtain a differentiated output signal C of negative polarity, and further, the part of positive polarity is clamp with a diode 14. Moreover, the differentiated output signal C is fed to a microprocessor, and the part of the differentiated output signal C at a prescribed level or lower is taken as the interruption signal to produce the interruption signal with a prescribed width, in a time interval T. |
