Circuit Device And Real-Time Clock Device

A circuit device includes a battery power supply terminal, an energy harvest power supply terminal, a storage power supply terminal, a power supply switch circuit, and a control circuit that controls the power supply switch circuit. In a first state, the power supply switch circuit outputs a storage power supply voltage to a supply node while charging the battery by supplying an energy harvest power supply voltage to the battery power supply terminal. In a second state, the power supply switch circuit outputs the storage power supply voltage and the energy harvest power supply voltage to the supply node while charging a storage capacitor by supplying the energy harvest power supply voltage to the storage power supply terminal.