| 摘要 |
PURPOSE:To select the existence of the protect of input switches for modification and the regulation of zero without increasing the input terminals of a LSI, by mounting each switch of input for midification and protect doubling as the regulation of zero. CONSTITUTION:If each switch S1, S2 of hour modifying input and minute modifying input are in ON when a protect switch S3 doubling as the regulation of zero is not in ON, hours or minutes are not quickly sent because output is not produced at AND 5, 6. When the switch S3 is beforehand in ON, signals are transmitted to an hour quick sending circuit 7 or a minute quick sending circuit 8, and hours or minutes are quickly sent. When the switch 3 is before in ON, zero is regulated, and the output of the switch S1 or S2 is introduced to the circuits 7 or 8. When the switch S1 or S2 is beforehand in ON, the input of an AND 3 becomes to ''0'', zero is not regulated even if the switch S3 is in ON, but the signals of the switch S1 or S2 are forwarded to the circuits 7 or 8 by the output of the AND 5 or 6. |
