JPS6418091A - Clock device - Google Patents

Abstract

PURPOSE:To lower product cost and reduce consumption of electric power in the breaking time of main power source in applying a simple circuit by operating a measuring part and performing update of time data only when a clock signal is input in the breaking time of main power source. CONSTITUTION:Electric power of an incorporated power source (b) is supplied at the braking time of main power source B. A clock generating means M1 generates a periodic clock signal, another measuring part M2 receives it and time is measured. The measuring part M2 stores time data by the use of a time data memory means M3 and the measuring part M2 is shifted from an operation condition to a stand-by condition at the breaking time of main power source B by the use of a condition shifting means M4. At this time the stand-by data corresponding to the stand-by condition are stored by a condition memory means 5. When the clock signal is input, a update beginning instruction is output by an update control means M6 after the measuring part M2 is shifted from the stand-by condition to the operation condition. Therefore, an update instruction is output after the time data of the means 3 are updated by a time data update means 7 and the measuring part M2 is shifted by the means 6 from the operation condition to the stand-by condition.