Calculator operation time period counter in a combination of electronic timepiece and electronic calculator

Claim 1

A power consumption display alarm system for a combination electronic digital timepiece and electronic calculator including a time keeping circuit, an arithmetic calculation circuit, a keyboard unit for introducing information into the arithmetic calculation circuit and a display for displaying information stored in the time keeping circuit and the arithmetic calculation circuit, said power consumption display alarm system comprising: a. power supply means for supplying power to the time keeping circuit and the arithmetic calculation circuit; b. first switching means interposed between the power supply and the arithmetic calculation circuit for activating the arithmetic calculation circuit only when the first switching means is operated, said time keeping circuit being activated continuously without operation of the first switching means; c. a calculator operation time period counter means for counting a time period in response to actuation of the first switching means; d. second switching means adapted to be operated only when said first switching means is operated, and interposed between the time keeping circuit and the calculation operation time period counter means, thereby introducing a clock signal from the time keeping circuit into the calculator operation time period counter only when the first switching means and the second switching means are operated; and e. power consumption display means contained in said display and connected to the calculator operation time period counter means for displaying information stored within the calculator operation time period counter means, thereby displaying power consumption in said combination electronic digital timepiece and electrical calculator.