Abstract: An image forming apparatus having an operation mode, an energy saving mode, and a stop mode includes an image forming unit that forms an image on a recording member, and a control unit that controls the image forming unit, wherein the control unit includes an arithmetic unit that performs a logical operation or a numerical operation, a storage unit that stores a register value used by the arithmetic unit in a non-volatile register which is readable and writable, and retains stored information even when no power is supplied, and a change unit that changes the register value stored in the non-volatile register so as to correspond to a mode change between the operation mode and the energy saving mode or between the operation mode and the stop mode.

Abstract: A program executing apparatus, includes: a nonvolatile memory that stores a program for activating an equipment and a variable used in the program and sustains the stored program and the variable even though power is not supplied, the program and the variable being able to be read out and written into the nonvolatile memory; and an executing unit that transmits the program and the variable to the nonvolatile memory when the activation of the equipment is instructed at an initial status where the program and the variable are not stored in the nonvolatile memory, and successively executes the program using the variable stored in the nonvolatile memory, and, when the activation of the equipment is re-instructed, executes the program using the variable stored in the nonvolatile memory.

Abstract: An image forming apparatus having an operation mode, an energy saving mode, and a stop mode includes an image forming unit that forms an image on a recording member, and a control unit that controls the image forming unit, wherein the control unit includes an arithmetic unit that performs a logical operation or a numerical operation, a storage unit that stores a register value used by the arithmetic unit in a non-volatile register which is readable and writable, and retains stored information even when no power is supplied, and a change unit that changes the register value stored in the non-volatile register so as to correspond to a mode change between the operation mode and the energy saving mode or between the operation mode and the stop mode.

Abstract: Provided is an information processor including: an operation unit performing logical operation or arithmetical operation; an execution unit executing predetermined functions based on the operation results; a clock signal generating unit generating a first clock signal to be a reference; a clock signal multiplying unit performing a multiplication operation on the first clock signal to generate a second clock signal; a clock signal selection unit selecting one of the first or second clock signals and supplies the selected signal to the execution unit; a memory storing data for setting the execution unit to be in an executable state in a readable and writable non-volatile memory; and a setting unit setting the execution unit to be in an executable state by causing the clock signal selection unit to select the first clock signal when reset is released and reading the data from the memory to start writing the data.

Abstract: A data processing apparatus includes an operation unit, a writable and readable volatile register, a writable and readable nonvolatile memory, first and second writing units and a write-back unit. The operation unit performs an arithmetic operation and a logical operation. The writable and readable volatile register stores data used in the operations performed by the operation unit. The writable and readable nonvolatile memory stores the data in parallel with the volatile register. The data stored in the nonvolatile memory is the data stored in the volatile register. The first writing unit writes the data in the volatile register. The second writing unit writes the data in the nonvolatile memory in parallel with the first writing unit every time the data is written in the volatile register. The write-back unit writes back the data stored in the nonvolatile memory to the volatile register when a power supply is turned on.

Abstract: A program executing apparatus, includes : a nonvolatile memory that stores a program for activating an equipment and a variable used in the program and sustains the stored program and the variable even though power is not supplied, the program and the variable being able to be read out and written into the nonvolatile memory; and an executing unit that transmits the program and the variable to the nonvolatile memory when the activation of the equipment is instructed at an initial status where the program and the variable are not stored in the nonvolatile memory, and successively executes the program using the variable stored in the nonvolatile memory, and, when the activation of the equipment is re-instructed, executes the program using the variable stored in the nonvolatile memory.

Abstract: An image forming apparatus having a communication interface receives image data through the communication interface to form an image. The image forming apparatus includes a power supply unit, a states monitor unit, and a mode switch unit. The power supply unit supplies electric power either in an operation mode in which the electric power necessary to form the image is supplied or in a power saving mode in which stand-by electric power is supplied. The states monitor unit monitors a connection state and a non-connection state of the communication interface. In the power saving mode, the mode switch unit switches the power supply unit to the operation mode, in response to detection by the states monitor unit of either of a change from the non-connection state to the connection state or a change from the connection state to the non-connection state.

Abstract: An image forming apparatus having a communication interface receives image data through the communication interface to form an image. The image forming apparatus includes a power supply unit, a states monitor unit, and a mode switch unit. The power supply unit supplies electric power either in an operation mode in which the electric power necessary to form the image is supplied or in a power saving mode in which stand-by electric power is supplied. The states monitor unit monitors a connection state and a non-connection state of the communication interface. In the power saving mode, the mode switch unit switches the power supply unit to the operation mode, in response to detection by the states monitor unit of either of a change from the non-connection state to the connection state or a change from the connection state to the non-connection state.