| 摘要 |
<p>PURPOSE:To prevent mulfunction due to the effect of noise, by detecting a mode among a plurality of consecutive reset pulses and outputting a mode switching signal when detection modes among respective reset pulses are coincident. CONSTITUTION:A counter 3 counts a clock applied to a terminal 6 while reset pulses are applied to a terminal 1. A mode signal detected at the counter 3 is sequentially stored in flip-flops 4, 8 and 9 every time the reset pulse is applied to the terminal 1. The coincidence of the output of the flip-flops 4, 8 and 9 is detected at an exclusive logical sum gate 10 and a flip-flop 11 is driven with this output, allowing to avoid the output of the flip-flop 11 from being affected with noise applied to the terminal.</p> |
