| 摘要 |
PURPOSE:To make it possible to effectively prevent noise, by simple circuit constitution such that the noise applied to the input terminal of an electronic circuit for imparting an input signal to various function parts is inhibited by a repeating pulse signal. CONSTITUTION:The circuit of an electronic timepiece is constituted of an electronic circuit, which consists of an oscillation circuit 1, a frequency dividing circuit 2, a timing counter 3, a display decoder 5, a display part 6 and a test control circuit 7, and test terminals T1-T3, AND gates 8-10, trigger flip-flop(T- FF)11 and delay type flip-flops(D-FF)13, 14. When the oscillation circuit 1 is operated, a signal of 256Hz is outputted from the frequency dividing circuit 2 and FFs 11, 13, 14 are reset according to said signal and the AND gates 8-10 are closed. Therefore, even if any noise is applied to the test terminals T1-T3, the input thereof can be inhibited. |
