| 摘要 |
PURPOSE:To enable to make the second-hand pointing coincide with that of a digital indication at all times by means of a simple constitution, by a method wherein a discarding and raising-to-a-unit of the fraction of 1/10 of a second unit digit are conducted at a time when a time is set to control a second-hand indication and a digital indication. CONSTITUTION:With a switch SWA closed to set a time, an output via D type FFF1, F2, and an NOR gate NOR1 in an input circuit 4 for resetting a second unit digit in a digital indication part 8 is produced into a high level to open an AND gate AND2 in a below-second interlocking circuit 5. An output of a latch circuit is produced into a high level at a time when 5 tenths of a second and upward is detected by a strobe signal STB1 corresponding to 5 tenths of a second. This generates a motor drive signal MS which drives a hand pointing indication of a high level by a full second via an AND gate 4. Simultaneously, a D+1 signal of a second unit digit + 1 signal is generated corresponding to detecting of 5 tenths of a second and upward by the switch SWB at a time when the second unit digit of the hand is reset. Thus, contents of each second unit digit of the hand and the digital indication which are driven by falling of 1Hz pulse can always be coincided with each other by means of a simple constitution. |
