发明名称 ELECTRONIC DEVICE
摘要 PURPOSE:To realize a real time clock with a low power consumption and to accurately recognize the residual capacity of batteries when a printing operation is started even in the waiting state for a key entry. CONSTITUTION:This device is provided with a frequency divider circuit 2 capable of selectively frequency-dividing the clock in several ways, a count pulse generation circuit 3 for outputting count up signals and count interval signals at every certain interval of time from the frequency-divided clock, a CPU 4 for the clock for performing counting for the clock and an interval discrimination circuit 5 for controlling the interval of the time of the count pulses for the clock based on the level of a battery voltage 7. The frequency division of the clock of the frequency divider circuit 2 is changed by the control information of the interval discrimination circuit 5. Thus, the CPU 4 prolongs the interval of the counted pulses when the capacity of the battery is reduced or the battery is left for a long time and the power consumption can be reduced to the utmost.
申请公布号 JPH064481(A) 申请公布日期 1994.01.14
申请号 JP19920161401 申请日期 1992.06.19
申请人 CANON INC 发明人 HARA TOSHIMASA
分类号 G01R31/36;G04G19/00;G04G99/00;G06F15/02;H02J7/00 主分类号 G01R31/36
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