| 摘要 |
PURPOSE:To prevent a full electronic timepiece from malfunction owing to a noise in alarm sounding and to take an IC test easily in a short time by inserting a chatter eliminating circuit even for a test signal. CONSTITUTION:A chattering eliminating circuit 1-4 is inserted for a test input signal 8, and its output signal is used to perform control over whether a mode input signal 2, selection input signal 4, and set input signals 6 are passed through chattering eliminating circuits 1-1, 1-2, and 1-3 or not respectively. During alarm sounding, if noises are induced on signal lines for said signals 2, 4, and 6, and a test signal 8, the noise of the test signal 8 is removed by the chattering elimiating circuit 104 and noise is cut off in the output signal 10. Theefore, noises induced in the signals 2, 4, and 6 are cut off through control logical gates 9-1, 9-2, and 9-3 in normal operation. |
