| 摘要 |
<p>PURPOSE: To form a world clock in which a parent clock is connected easily to a child clock, which can be assembled easily even when the number of child clocks is large and which can install more child clocks extremely easily. CONSTITUTION: A world clock uses a child clock 20 which is provided with a register 32 for storage of time data, with a latched circuit 23, with a driver 25 and with a time display part 27. The world clock is provided with a register 22 for storage of additional information, with a latch control circuit 35 which passes or cuts off a latch signal by data from the register 33 for storage of the additional information and with a child clock 20 which is installed additionally.</p> |
