A watch/calculator is disclosed which employs a holdcircuit to hold clock incrementing pulses when datafrom the clock is transferred to calculator circuitry oran arithmetic operation is performed on the data. Whenthe time data is returned from the calculator circuitry tothe clock circuitry or the arithmetic operation is com-pleted, the hold circuit releases any held incrementingsignal so that an increment signal is not lost, even whenthe time data is momentarily out of the clock circuitryin the calculator circuitry or other operations are beingperformed on the time data. Thus, when the time data isreturned to the clock circuitry or the operation is com-pleted, the data is incremented or updated as it wouldhave been normally
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