An information processing device includes a first processor core of 2n-bits unit, a second processor core of n-bit(s) unit, a DRAM set including a first DRAM and a second DRAM of n-bit(s) unit, a first transmitting path between the first processor core and the DRAM set, a second transmitting path between the second processor core and the first or second DRAM, a transmitting path switching circuit, and a power supply controlling circuit. In normal operation, with switching to the first transmitting path and supplying power to the first processor core and the first and second DRAMs, the first processor core uses the first and second DRAMs. In power saving operation, with switching to the second transmitting path, supplying power to the second processor core and the first DRAM and stopping power to the first processor core and the second DRAM, the second processor core uses the first DRAM.

An image forming apparatus includes an image forming unit configured to form an image on a sheet based on image data, a control unit configured to control driving of the image forming unit, and a power supply unit configured to, if a factor for shifting from a power saving state to a standby state is detected, supply power to the image forming unit and the control unit. If a first type of factor is detected as the factor in the power saving state, the power supply unit supplies power to the control unit and the image forming unit, and the control unit restricts the driving of the image forming unit. If an instruction to perform a function of forming an image on a sheet is accepted, the control unit cancels restriction of the driving of the image forming unit.

According to one embodiment, an image forming apparatus includes a printer unit, a first controller, a power supply unit, and a second controller. The printer unit forms an image on a sheet. The first controller performs a control of shifting a state of the apparatus from a normal mode to a power saving mode. The power supply unit supplies power to the first controller and the printer unit in the normal mode and supplies power to the first controller and stops power supply to the printer unit in the power saving mode. The second controller performs a power supply control on the printer unit before performing a power supply control on the first controller when a packet received in the power saving mode includes specific information indicating a print job.

In a client machine that collects first data that is operation information of an apparatus and second data related to a use situation of a plurality of pieces of hardware including a processor, a memory, and a storage, control is performed so that, in a case where the client machine is in a power-saving state at a timing when data that is collected in the apparatus is transmitted to an external system, recovery from the power-saving state is performed and transmission of the first data is not restricted, and transmission of the second data is restricted, and in a case where the client machine is not in the power-saving state at the timing, the transmission of the first data and the transmission of the second data are not restricted.

An information processing system includes a first information processing apparatus, and a second information processing apparatus. The second information processing apparatus periodically acquires information from the first information processing apparatus, and stops periodically acquiring information if there is a factor for shifting a power state of the first information processing apparatus into a power saving state. The second information processing apparatus transmits information to the first information processing apparatus in a case where periodically acquiring information from the first information processing apparatus is stopped. The first information processing apparatus shifts into the second power state if the information is received.

A device including a replaceable component, in which the component is not electrically connected to the device and includes a component-side storage, a component-side transmitter/receiver, a component-side hardware processor, and a component-side power generator, the device includes a main-body side storage, a counter which counts up the consumption degree of the component stored in the main-body storage, a main-body side transmitter/receiver, a main-body side hardware processor, a main-body side power generator, and a detector which detects attachment and detachment, the main-body side hardware processor causes the main-body side transmitter/receiver to transmit the specific identification information of the component and the consumption degree of the component when detachment is detected, and the component-side hardware processor rewrites the information in the component-side storage on the basis of the specific identification information of the component and the consumption degree of the component.

A printer apparatus that operates with power supplied by a power supply device includes: a printing unit that performs printing; a communication unit that is connected by USB to an external apparatus and supplies the power to the external apparatus; and a print control unit that causes the printing unit to perform printing in accordance with a print command received by the communication unit. When the printing unit performs the printing, the print control unit causes the communication unit to transmit a power-saving-enabling instruction that instructs the external apparatus to enter a power saving state.

A power supply apparatus includes a clock signal generating unit that generates a clock signal with a clock frequency, a calculating unit that calculates a frequency at which a first frequency, a second frequency, and a third frequency are synchronized based on the clock frequency, an AC voltage output unit that outputs an AC voltage of the second frequency based on a signal of the first frequency, a DC voltage output unit outputting a DC voltage based on a signal of the third frequency, and an output unit that outputs based on the AC voltage and the DC voltage.

An EEE function when an electricity saving function is enabled and a PHY communication rate setting method need to be taken into consideration. In relation to communication with an external apparatus by a communication unit, an information processing apparatus determines whether a power saving function of realizing power saving of the communication unit by stopping some of functions of the communication unit while establishing a link is enabled. In accordance with the result of the determination, a communication rate when the information processing apparatus operates in a power saving mode is decided.

An electronic device, which can charge a battery selected from a plurality of batteries and can drive the battery as a power feeding source, includes a control unit and a display unit. When a remaining power of a second battery that does not correspond to a first battery selected as a battery to be charged or the power feeding source among the plurality of batteries is higher than or equal to a predetermined threshold value, the control unit causes the display unit to display a remaining power of the first battery from among the remaining power of the first battery and the remaining power of the second battery, and when the remaining power of the second battery is lower than the threshold value, the control unit causes the display unit to display the remaining power of the first battery and the remaining power of the second battery.