| 摘要 |
PURPOSE:To make a wrist watch easy to find by generating an alarm tone if an input switch is not operated for a certain time. CONSTITUTION:A timing pulse 7 is counted by a counting circuit 6, and the counted value is cleared by an input switch 8. The present time is counted by a counting circuit 1, and the counted value is compared with an alarm time in a register 2 by a coincidence detecting circuit 3. If the objective switch 8 is not operated within the period determined by the cycle of pulses 7 and the counting circuit 6, the alarm tone is generated from an alarm tone generating circuit 4 and a speaker 5 on a basis of the output of the coincidence detecting circuit 3. |
