| 摘要 |
PURPOSE:To obtain correctly an N-frequency-divided pulse from the time of switching by feeding back the output of an N-frequency-divider through a selector and a flip-flop and operating the frequency-divider from an initial value when switching is executed from a time pulse supplied to an error pulse counter to the output of the N-frequency-divider. CONSTITUTION:When an error alarm is sent, H is added to an AND circuit 10 in an error pulse counter 30 and turned on and L is added to an AND circuit 11 and turned off. Since an output L of the AND circuit 10 is converted through an NOR circuit 12 and an FF 20 to the H and added to the load terminal of a counter 9 in 10 frequency-dividers 31, a timer pulse entered to a counting action and added to a terminal EN is counted and when 10 counts are executed, a carry is sent. The carry is added through the AND circuit 10, the NOR circuit 12, the FF20 and an inverter 18 to an error pulse counter 30, and since the error pulse is not inputted until this time, an error alarm is released, and for a selector 32, the AND circuit 11 is turned on, and the timer pulse of a period T is added to the error counter 30 again.
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