A smart watch includes a watch casing with a display disposed along the watch casing. One or more processors are operable with the display. An energy storage device powers the one or more processors. When an amount of stored energy in the energy storage device is above a predefined threshold, the one or more processors perform a timekeeping function and at least one additional function. When the amount of stored energy in the energy storage device falls below the predefined threshold, the one or more processors disable the at least one additional function while continuing to perform the timekeeping function.

An electronic apparatus includes a secondary battery, a first power feeder, a second power feeder, and a processor. The first power feeder feeds power to the secondary battery. The second power feeder feeds power to the secondary battery at a current larger than a current fed by the first power feeder. The processor detects a voltage of the secondary battery, and determines a remaining power of the secondary battery based on a comparison of the detected voltage with first or second reference values. The first reference value is a predetermined value set in accordance with the current fed by the first power feeder. The second reference value is a predetermined value set in accordance with the current fed by the second power feeder, and is higher than the first reference value.

An electronic apparatus includes a secondary battery, a first power feeder, a second power feeder, and a processor. The first power feeder feeds power to the secondary battery. The second power feeder feeds power to the secondary battery at a current larger than a current fed by the first power feeder. The processor detects a voltage of the secondary battery, and determines a remaining power of the secondary battery based on a comparison of the detected voltage with first or second reference values. The first reference value is a predetermined value set in accordance with the current fed by the first power feeder. The second reference value is a predetermined value set in accordance with the current fed by the second power feeder, and is higher than the first reference value.

A semiconductor device includes: a secondary battery; a constant voltage generation circuit that is driven in accordance with the secondary battery; a control logic circuit that is driven with a constant voltage generated by the constant voltage generation circuit and controls the constant voltage generation circuit; and a starting circuit that outputs a control signal for operating the constant voltage generation circuit in correspondence to an initialization signal input from outside in a case in which the constant voltage generation circuit is stopped.

A semiconductor device includes: a secondary battery; a constant voltage generation circuit that is driven in accordance with the secondary battery; a control logic circuit that is driven with a constant voltage generated by the constant voltage generation circuit and controls the constant voltage generation circuit; and a starting circuit that outputs a control signal for operating the constant voltage generation circuit in correspondence to an initialization signal input from outside in a case in which the constant voltage generation circuit is stopped.

A switching method and an electronic device are provided. The electronic device at least includes a first processor and a second processor. The method includes: generating, by the first processor, switching indication information in a case where a screen-on switching condition is satisfied, where the switching indication information is configured to instruct the first processor to keep displaying a first interface image during the execution of a screen-off process; implementing, by the first processor, the screen-off process under a screen-on state according to the switching indication information; sending, by the first processor, a screen switching message to the second processor in a case where the screen-off process is completed; and determining, by the second processor, to obtain screen control authority and displaying a second interface image of a second application.

A switching method and an electronic device are provided. The electronic device at least includes a first processor and a second processor. The method includes: generating, by the first processor, switching indication information in a case where a screen-on switching condition is satisfied, where the switching indication information is configured to instruct the first processor to keep displaying a first interface image during the execution of a screen-off process; implementing, by the first processor, the screen-off process under a screen-on state according to the switching indication information; sending, by the first processor, a screen switching message to the second processor in a case where the screen-off process is completed; and determining, by the second processor, to obtain screen control authority and displaying a second interface image of a second application.