| 摘要 |
<p>PURPOSE:To monitor clock and frame pulse by one circuit and to shorten interruption detection time. CONSTITUTION:A counter 1 for which a count value is reset in response to the input of the frame pulses is used and a counting operation is performed while the clock C is inputted. When the count value becomes a prescribed value equal to or more than the repetitive cycle of the frame pulse F, the counting operation is stopped by the decoded output of a decoder 2. In response to the stoppage, alarming signals are transmitted from a monostable multivibrator 3. Thus, the alarming signals are transmitted when at least one of the clock and the frame pulse is interrupted. When the prescribed value is made small as much as possible, the interruption detection time is shortened as well.</p> |
