JPS5712390A - Electronic timepiece - Google Patents

Abstract

PURPOSE:To obtain a low-power consumptive, easily mass-producing electronic timepiece capable of self-diagnosing by detecting a frequency division output and by controlling electric power to be supplied to a frequency dividing circuit, etc. CONSTITUTION:The oscillation output of an oscillating circiut 2 is waveform- shaped by way of a gate 7 opened with a one-second pulse, etc., from a timing generating circuit 4 and the counted by the counter 8 of a malfunction detector 11, and when its count value is judged to be a prescribed value and normal, a discriminating circuit 9 generates a high-level discrimination signal. In response to this discrimination signal, the counter 12 of a power limiting device 14 goes down by one by the output pulse of the one-pulse generating circit 10 of the detector 11. Then, a current limiting block 13 reduces power supplied to the circuit, a frequency dividing circuit, etc., and if the detector 11 detects a fault, the supply power is increased. Therefore, the timepiece is capable of self-diagnosing and even if parts and elements have variances, the easily mass-producing timepiece driven by minimum power according to the result of the diagnosis is obtained.