| 摘要 |
PURPOSE:To attain a lot of processings within a prescribed time by connecting a frequency division circuit between an input terminal and a microcomputer so as to count an input pulse by means of both the leading and trailing of the input. CONSTITUTION:A pulse signal inputted from a terminal 11 is inputted to a frequency division circuit 12 so as to detect the trailing, the signal is converted into a frequency division signal of 50% duty being risen at the trailing of one pulse and trailing at the next pulse and inputted to the microcomputer 20. Then, the leading and trailing of the frequency dividing signal are detected by H and L level detecting circuits 13, 14 respectively, and this signal is inputted to L-H and H-L level change detecting circuits 15, 16 so as to detect the leading or trailing of the frequency dividing signal. This output is counted alternatley by a counter 18 via an OR circuit 17, and the leading and trailing signal is counted sequentially. Then, the counted signal is formed as a display signal by a decoder 19 and displayed on a display device 21. |
