JP2013242780A - Information processing apparatus, and control method and control program of information processing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve both low power consumption control of an arithmetic unit included in an apparatus, and detailed control and return control of a power saving state by software.SOLUTION: An information processing apparatus refers to information that is stored in a storage area accessible by a CPU 10 in a state where a clock frequency is reduced, of the storage areas of a RAM 11, the information correlating a combination of a state of the apparatus and an event that has occurred in the apparatus with a state to be transitioned to thereafter, and controls state transition of the apparatus in a power-saving state on the basis of the state of the apparatus and the event that has occurred in the apparatus.

Description

  The present invention relates to an information processing apparatus, a control method for the information processing apparatus, and a control program, and more particularly to detailed state control in a power saving state.

  In recent years, there has been a tendency to digitize information, and image processing apparatuses such as printers and facsimiles used for outputting digitized information and scanners used for digitizing documents have become indispensable devices. Such an image processing apparatus is often configured as a multifunction machine that can be used as a printer, a facsimile, a scanner, or a copier by providing an imaging function, an image forming function, a communication function, and the like.

  In recent years, a power-saving standard has been established to reduce the power consumption of electronic devices, and international efforts are being made. The power saving standard covers not only the operation of the device but also the power consumption when it is not operating. Therefore, in order to satisfy the power saving standard, it is necessary to reduce power consumption including during operation and standby.

  Since the above-described image processing apparatus is also a kind of electronic equipment, reduction in power consumption is required including during operation and standby. Here, as a technique for power saving of an electronic apparatus having an arithmetic device such as a CPU (Central Processing Unit), one arithmetic device among a plurality of arithmetic devices is operated in a state where the clock frequency is suppressed by clock gating. Then, a method has been proposed in which the operation is performed for detection of a return event and another arithmetic device is set to a low power consumption mode (see, for example, Patent Document 1).

  An arithmetic unit such as a CPU in the low power consumption mode cannot perform complicated processing with a load. Therefore, in order to perform optimal power saving control by monitoring the entire system by software control and to make a return determination, another arithmetic unit is required for this purpose. In the technique disclosed in Patent Document 1, Is also assumed to include a plurality of CPUs.

  Therefore, the invention disclosed in Patent Document 1 cannot be applied to an electronic device including a single arithmetic device. When a plurality of arithmetic devices are included, at least one of them needs to maintain a certain level of clock, and there is room for further power saving. Note that the above-described problem is not unique to the image processing apparatus, and may similarly be a problem in general information processing apparatuses that perform power saving control by performing arithmetic operations according to software programs.

  The present invention has been made in consideration of the above circumstances, and an object of the present invention is to achieve both low power consumption control of an arithmetic device included in the apparatus and detailed control and return control of a power saving state by software.

  In order to solve the above problems, an embodiment of the present invention is an information processing device that performs power saving control by restricting power supply to each unit of the device, and the arithmetic device performs an operation according to a program read to the storage medium. And a power saving state control unit that controls the apparatus in a power saving state in which the power supply is restricted, and a power saving control unit that controls transition to the power saving state, and The control unit controls to reduce the clock frequency of the arithmetic device upon transition to the power saving state, and the power saving state control unit reduces the clock frequency in the storage area of the storage medium. Information stored in a storage area accessible to the computing device in a state, and a combination of the status of the information processing device and an event that has occurred in the information processing device Control of state transition of the information processing apparatus in the power saving state based on the state of the information processing apparatus and an event that has occurred in the information processing apparatus. An information processing apparatus characterized by that.

  According to another aspect of the present invention, there is provided a method for controlling an information processing apparatus that performs power saving control by restricting power supply to each unit of the apparatus, and the arithmetic device performs an operation according to a program read to a storage medium. Thus, the device control in the power saving state in which the power supply is restricted is performed, and the clock frequency of the arithmetic device is controlled to be reduced at the time of transition to the power saving state. Information stored in a storage area accessible by the arithmetic device in a state where the clock frequency is reduced in a storage area of the medium, and a state of the information processing apparatus and an event occurring in the information processing apparatus The information associated with the combination and the state to be changed thereafter is referred to, the state of the information processing device and the information processing device And controlling a state transition of the information processing apparatus in the power saving state based on Oite generated event.

  According to still another aspect of the present invention, there is provided a control program for an information processing apparatus that performs power saving control by restricting power supply to each unit of the apparatus, and at the time of transition to the power saving state in which the power supply is restricted. A step of controlling the clock frequency of the arithmetic device to be reduced; a step of detecting an event occurring in the information processing device in the power saving state; and a step of detecting a storage area of the storage medium in the power saving state. Information stored in a storage area accessible by the arithmetic device in a state where the clock frequency is reduced, and a combination of the state of the information processing device and an event occurring in the information processing device, and subsequent transition The information associated with the state to be executed is referred to, the state of the information processing device and the information processing device And controlling a state transition of the information processing apparatus in the power saving state based on events that have occurred had, characterized in that to be executed by the information processing apparatus.

  According to the present invention, it is possible to achieve both low power consumption control of an arithmetic device included in the apparatus and detailed control and return control of a power saving state by software.

FIG. 2 is a block diagram illustrating a hardware configuration of a part of the image processing apparatus according to the embodiment of the present invention. It is a figure which shows the function structure of the image processing apparatus which concerns on embodiment of this invention. It is a figure which shows the software structure of the image processing apparatus which concerns on embodiment of this invention. It is a figure which shows the example of the storage area of RAM which concerns on embodiment of this invention. It is a figure which shows the example of the state transition determination table which concerns on embodiment of this invention. It is a sequence diagram which shows operation | movement of the image processing apparatus which concerns on embodiment of this invention. It is a sequence diagram which shows operation | movement of the image processing apparatus which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The gist of the present embodiment is that an image processing apparatus that is a multifunction peripheral (MFP) performs appropriate power saving control according to the state while a single CPU is in a low power consumption state. is there.

  FIG. 1 is a block diagram showing a hardware configuration of a controller 20 that controls the apparatus in the image processing apparatus 1 according to the present embodiment. As shown in FIG. 1, the controller 20 of the image processing apparatus 1 according to the present embodiment has the same configuration as an information processing terminal such as a general server or a PC (Personal Computer). That is, the controller 20 according to the present embodiment includes a CPU (Central Processing Unit) 10, a RAM (Random Access Memory) 11, a ROM (Read Only Memory) 12, a network I / F 13, a serial port I / F 14, a memory card I / F. F15, image input I / F16, and image output I / F17 are included.

  The CPU 10 is a calculation unit and controls the operation of the entire image processing apparatus 1. The RAM 11 is a volatile storage medium capable of reading and writing information at high speed, and is used as a work area when the CPU 10 processes information. The ROM 12 is a read-only nonvolatile storage medium, and stores programs such as firmware.

  The network I / F 13 is an interface for connecting the image processing apparatus 1 to a LAN (Local Area Network) or the Internet, and an Ethernet (registered trademark) interface or the like is used. The serial port I / F 14 is an interface used when the image processing measure 1 is connected to an information processing terminal such as a PC. The memory card I / F 15 is a card slot for connecting a memory card such as an SD card or a memory stick to the image processing apparatus 1.

  The image input I / F 16 is an interface for connecting an image input device such as a scanner to the controller 20. The image output I / F 17 is an interface for connecting an image forming output device such as a plotter to the controller 20. In addition to the configuration illustrated in FIG. 1, the controller 20 includes an interface for connecting a display device for displaying a visual user interface in the image processing device 1 and an operation unit for operating the image processing device 1 by the user. including. For these interfaces, for example, a USB (Universal Serial Bus) interface is used.

  In such a hardware configuration, a program stored in a recording medium such as a memory card connected to the ROM 12 or the memory card I / F 15 or an optical disk (not shown) is read out to the RAM 11, and the CPU 10 performs an operation according to these programs. By doing so, a software control unit is configured. A functional block that realizes the functions of the image processing apparatus 1 according to the present embodiment is configured by a combination of the software control unit configured as described above and hardware.

  Next, a functional configuration of the image processing apparatus 1 according to the present embodiment will be described with reference to FIG. FIG. 2 is a block diagram illustrating a functional configuration of the image processing apparatus 1 according to the present embodiment. As shown in FIG. 2, the image processing apparatus 1 according to the present embodiment includes a controller 20, an ADF (Auto Document Feeder) 110, a scanner unit 22, a paper discharge tray 23, a display panel 24, and a paper feed table. 25, a print engine 26, a paper discharge tray 27, and a network I / F 13.

  The controller 20 includes a main control unit 30, an engine control unit 31, an input / output control unit 32, an image processing unit 33, and an operation display control unit 34. As shown in FIG. 2, the image processing apparatus 1 according to the present embodiment is configured as a multifunction machine having a scanner unit 22 and a print engine 26. In FIG. 2, the electrical connection is indicated by solid arrows, and the flow of paper is indicated by broken arrows.

  The display panel 24 is an output interface that visually displays the state of the image processing apparatus 1 and is an input when the user directly operates the image processing apparatus 1 or inputs information to the image processing apparatus 1 as a touch panel. It is also an interface (operation unit). As described above, the controller 20 is configured by a combination of software and hardware. The controller 20 functions as a control unit that controls the entire image processing apparatus 1.

  The main control unit 30 plays a role of controlling each unit included in the controller 20 and gives a command to each unit of the controller 20. The engine control unit 31 serves as a drive unit that controls or drives the print engine 26, the scanner unit 22, and the like. The print engine 31 controls the scanner unit 22 and the print engine 26 via the image input I / F 16 and the image output I / F 17 shown in FIG.

  The input / output control unit 32 inputs a signal or a command input via the network I / F 13 or the serial port I / F 14 to the main control unit 30. The main control unit 30 also controls the input / output control unit 32 to access other devices via the network I / F 13 or the serial port I / F 14.

  The image processing unit 33 generates drawing information based on the print information included in the input print job under the control of the main control unit 30. The drawing information is information for drawing an image to be formed in the image forming operation by the print engine 26 as an image forming unit. The print information included in the print job is image information converted into a format that can be recognized by the image processing apparatus 1 by a printer driver installed in an information processing apparatus such as a PC. The operation display control unit 34 displays information on the display panel 24 or notifies the main control unit 30 of information input via the display panel 24.

  When the image processing apparatus 1 operates as a printer, first, the input / output control unit 32 receives a print job via the network I / F 13. The input / output control unit 32 transfers the received print job to the main control unit 30. When receiving the print job, the main control unit 30 controls the image processing unit 33 to generate drawing information based on the print information included in the print job.

  When drawing information is generated by the image processing unit 33, the engine control unit 31 performs image formation on the paper conveyed from the paper feed table 25 based on the generated drawing information. A document on which an image has been formed by the print engine 26 is discharged to a discharge tray 27.

  When the image processing apparatus 1 operates as a scanner, the operation display control unit 34 or the input / output unit is operated in accordance with a user operation on the display panel 24 or a scan execution instruction input from an external PC or the like via the network I / F 13. The control unit 32 transfers a scan execution signal to the main control unit 30. The main control unit 30 controls the engine control unit 31 based on the received scan execution signal.

  The engine control unit 31 drives the ADF 21 and conveys the document to be imaged set on the ADF 21 to the scanner unit 22. Further, the engine control unit 31 drives the scanner unit 22 and images a document conveyed from the ADF 21. If no original is set on the ADF 21 and the original is directly set on the scanner unit 22, the scanner unit 22 takes an image of the set original under the control of the engine control unit 31.

  In the imaging operation, an imaging element such as a CCD included in the scanner unit 22 optically scans the document, and imaging information generated based on the optical information is generated. The engine control unit 31 transfers the imaging information generated by the scanner unit 22 to the image processing unit 33. The image processing unit 33 generates image information based on the imaging information received from the engine control unit 31 according to the control of the main control unit 30.

  The image information generated by the image processing unit 33 is stored in a storage medium attached to the image processing apparatus 1. The image information generated by the image processing unit 33 is stored as it is in a storage medium or transmitted to an external device via the input / output control unit 32 in accordance with a user instruction.

  When the image processing apparatus 1 operates as a copying machine, the image processing unit 33 generates drawing information based on the imaging information received by the engine control unit 31 from the scanner unit 22 or the image information generated by the image processing unit 33. To do. Based on the drawing information, the engine control unit 31 drives the print engine 26 as in the case of the printer operation.

  Next, the configuration of software functions included in the main control unit 30 according to the present embodiment will be described with reference to FIG. As shown in FIG. 3, the main control unit 30 according to the present embodiment includes a main control unit 41, an energy saving control unit 42, an energy saving time control unit 43, and a state transition determination table 44.

  The main control unit 41 is a control unit that controls basic functions of the image processing apparatus 1 and controls operations as the above-described printer, scanner, and copier. The energy saving control unit 42 controls the transition to a power saving state in which power supply to each unit of the image processing apparatus 1 is stopped or reduced. That is, the energy saving control unit 42 functions as a power saving control unit.

  When the CPU 10 is in a low power consumption state, the energy saving control unit 43 performs determination such as transition of the image processing apparatus 1 to various states and detection of return to the normal state. That is, the energy saving control unit 43 functions as a power saving state control unit.

  The state transition determination table 44 is information that the energy saving control unit 43 should refer to in order to make a determination such as transition to various states of the image processing apparatus 1 and detection of return to the normal state. The state transition determination table 33 is stored in a predetermined area secured in the RAM 11 so that it can be referred to also by the energy saving control unit 43 configured by the calculation of the CPU 10 in the low power consumption state.

  FIG. 4 is a diagram showing an aspect of the storage area of the RAM 11 according to the present embodiment. As shown in FIG. 4, a text area 11a, a static area 11b, and a dynamic area 11c are secured in the RAM 11 according to the present embodiment. The text area 11a is an area where a program is loaded. The static area 11b is an area in which static variables such as global variables are stored, and can be accessed even by the CPU 10 in an energy saving state with low power consumption.

  In other words, the static area 11b is information that the energy saving time control unit 43 refers to while the program for configuring the energy saving time control part 43 is being read into the text area 11a in the storage area of the RAM 11. This is an area in which a certain state transition determination table 44 is stored. At this time, the state transition determination table 44 is continuously stored at a fixed position in the storage area of the RAM 11 while the program of the energy saving control unit 43 is being read.

  As described above, of the information referred to by the CPU 10 that performs the calculation according to the program, the area in which the information that is kept stored at a certain position while the program is read is the static area 11b.

  The dynamic area 11c is an area used for dynamic management of the memory, and is an area used for storing a local variable and temporarily saving a register value of the CPU 10. The state transition determination table 44 is stored in the static area 11b among the areas of the RAM 11 secured in this way.

  Next, the contents of the information included in the state transition determination table 44 will be described with reference to FIGS. FIG. 5A is a diagram illustrating the contents of the state transition table among the information included in the state transition determination table 44. As shown in FIG. 5A, the state transition table includes information indicating the state of the image processing apparatus 1 such as “state A”, “state B”, “state C”, and “event 1”, “event 2”. This is a matrix table in which values are stored for each combination with information indicating an event that occurs in the image processing apparatus 1 such as “, event 3”.

  In the example of FIG. 5A, for example, when “event 1” occurs in “state A”, the image processing apparatus 1 transitions to “state B”. That is, the state transition table shown in FIG. 5A is information in which information indicating a state to be subsequently transitioned is associated with each combination of state and event.

  FIG. 5B is a diagram showing the contents of the state table showing the details of each state specified in the state transition table among the information included in the state transition table 34. As shown in FIG. 5B, the status table includes “module 1”, “module 2”, “module 3”, etc. for each status such as “status A”, “status B”, “status C”, etc. This is information specifying the control state of each module such as ON, OFF, and low clock.

  Each module such as “module 1”, “module 2”, and “module 3” illustrated in FIG. 5B includes, for example, the network I / F 13, the serial port I / F 14, and the memory card I / F 15 illustrated in FIG. An interface or an interface for connecting the display panel 24. In the power saving control, each interface is controlled by controlling each interface. In the example of FIG. 5B, “state B” indicates that “module 1” and “module 2” are in the “OFF” state, and “module 3” is in the “low clock” state.

  The state transition table shown in FIG. 5A and the state table shown in FIG. 5B are preferably configured to be changeable by the user. Thereby, power saving control according to the operating environment of the image processing apparatus 1 is possible.

  Next, an operation related to power saving control of the image processing apparatus 1 according to the present embodiment will be described. FIG. 6 is a sequence diagram showing an operation when the image processing apparatus 1 is turned on. As shown in FIG. 6, when the image processing apparatus 1 is turned on and the program is loaded into the RAM 11 to configure the functions of the controller 20 as shown in FIGS. An initialization process is performed on the control unit that controls (S601).

  Here, the control unit for controlling each module includes an interface such as the network I / F 13, serial port I / F 14, and memory card I / F 15 shown in FIG. 1 and an interface for connecting the display panel 24. It is a control part for controlling, for example, driver software for controlling each module.

  Specifically, the interface for connecting the display panel 24 is the operation display control unit 34 shown in FIG. 2, and the network I / F 13 or the serial port I / F 14 is the input / output shown in FIG. It is the control unit 32. If the image input I / F 16 and the image output I / F 17 are used, the engine control unit 31 shown in FIG.

  The control unit of each module that has received the initialization process by the energy saving control unit 42 registers a callback function for performing state transition determination such as energy saving transition or return in the energy saving control unit 42 (S602). Thereby, the operation related to the power saving control when the image processing apparatus 1 is powered on is completed.

  FIG. 7 is a sequence diagram illustrating the subsequent operations to the energy saving mode and the return operation from the energy saving mode in the image processing apparatus 1. As shown in FIG. 7, first, the main control unit 41 gives an energy saving transition instruction to the energy saving control unit 42 in response to the user's operation and the transition to the energy saving state such as satisfaction of the energy saving transition condition (S701). At this time, the main control unit 41 confirms the operating state of the application program for realizing the functions of the printer and scanner as described above, and issues an energy saving transition instruction after confirming that none is being executed. You may do it. Thereby, inconsistency of system operation can be prevented.

  The energy saving control unit 42 that has received the energy saving transition instruction from the main control unit 41 performs an energy saving transition determination process (S702). In S702, the energy saving control unit 42 reads the callback function registered in S602 in FIG. 6, and confirms that all modules related to the energy saving transition can be shifted to the energy saving state. When there is a module that cannot be shifted to the energy saving state, the energy saving control unit 42 may notify the main control of the failure and cancel the shift to the energy saving state.

  When it is confirmed that all the modules related to the energy saving transition can be transferred to the energy saving, the energy saving control unit 42 instructs the control unit of each module to save energy (S703). The energy saving control unit 42 that has issued the energy saving transition instruction performs the energy saving transition initialization process (S704). The processing in S704 is processing related to preparation for shifting hardware to an energy saving state, such as clock gating.

  When the energy saving transition initialization process is finished, the energy saving control unit 42 starts the actual energy saving transition process. In the actual energy saving transition process, the energy saving control unit 42 first performs a registration process of an energy saving return determination routine (S705). The energy saving return determination routine is a callout function registered in the energy saving time control unit 44, and the energy saving return is determined by calculation processing of the callout function.

  Next, the energy saving control unit 42 performs network return condition setting processing (S706). In S706, the energy saving control unit 42 sets a return condition according to the network state, such as receiving a specific packet from the network.

  Next, the energy saving control unit 42 performs clock gating setting processing (S707). In step S707, the energy saving control unit 42 sets a device that stops clock supply. A plurality of devices that can stop the clock supply can be selected. For example, each interface such as the network I / F 13 and the serial port I / F 14 shown in FIG. 1 can be selected.

  When the processes of S706 and S707 are completed, the energy saving control unit 42 performs the energy saving transition process by shifting the CPU 10 to the low power state (S708). Thereby, the subsequent processing is taken over by the energy saving control unit 44. In the energy saving state after the energy saving transition, the clock of the CPU 10 is maintained at a lower level than usual, and complicated arithmetic processing cannot be performed.

  The CPU 10 in the energy saving state cannot jump to a function call outside the energy saving return determination routine registered in the energy saving time control unit 44 or outside the routine. Further, the data access by the CPU 10 in the energy saving state is possible only for the stack area or the static area 11b secured in the dynamic area 11c shown in FIG. In the energy saving state, the size of the stack area is limited.

  In addition, it is possible to access a register provided in each module such as the network I / F 13 described with reference to FIG. 1, thereby detecting an event occurring in each module. In the energy saving state, the RAM 11 stops the clock and shifts to the self-refresh mode, and the clock supply to each module is stopped according to the setting or becomes a low clock.

  When shifting to the energy saving state by such processing, the energy saving time control unit 34 repeats the return determination processing by monitoring the return event in accordance with the energy saving return determination routine registered in S705 (S709). Here, as described above, the energy saving control unit 34 is configured by the CPU 10 in the low clock state performing calculations according to a predetermined program. Therefore, it is impossible to perform condition determination processing that places a load on the CPU 10 such as complicated return determination logic.

  Therefore, the energy saving control unit 44 according to the present embodiment refers to the state transition determination table 44 stored in the static area 11b that can be accessed even by the CPU 10 in the energy saving state, as described in FIG. Then, based on the information described with reference to FIG. 5, the current state and the state to be changed are determined based on the event that has occurred. In such a process, the columns and rows of the table shown in FIG. 5A are determined based on the current state and the event that has occurred, respectively, and simply referencing the post-transition state determined by the matrix. It is possible to determine the state to be changed by the process, and even the calculation by the CPU 10 in the energy saving state can be executed.

  As described with reference to FIG. 5A, the state transition table is configured such that the state to be transitioned is determined by a matrix of the current state of the image processing apparatus 1 and the events that have occurred. Therefore, even when the image processing apparatus 1 is in an energy saving state, the energy saving control unit 44 can perform state management in more detail.

  Through such processing, when the energy saving control unit 44 detects a return event (S710), it notifies the energy saving control unit 42 of a return (S711). 5A and 5B show the state transition table and the state table information in which the details of each state are described, and the expression “return” is not explained, but “return” "" Indicates that the condition for transitioning the image processing apparatus 1 to the normal state is satisfied.

  Therefore, assuming that “state A” is the normal state among the states shown in FIGS. 5A and 5B, the energy-saving control unit 44 detects an event that satisfies the transition condition to “state A”. If it is, it is determined that a return event has been detected.

  Receiving the return notification from the energy saving time control unit 44, the energy saving control unit 42 stops the clock supply or resumes the normal clock supply to the module that has been switched to the low clock, and performs the energy saving return control (S712). At this time, the energy saving control unit 42 notifies the main control unit 41 of energy saving return, and ends the process.

  By such processing, the return to and from the energy saving mode according to the present embodiment is completed. As described above, in the image processing apparatus 1 according to the present embodiment, the state transition determination is performed based on the state transition determination table 44 as illustrated in FIGS. It can be executed by calculation for table reference processing, and can be executed even by the CPU 10 in a low clock state. Further, since the information shown in FIGS. 5A and 5B is stored in the static area 11b of the RAM 11 accessible even by the CPU 10 in the low clock state, the information in the low clock state is the same as described above. Even the CPU 10 can be executed.

  As described above, in the image processing apparatus 1 according to the present embodiment, it is possible to achieve both low power consumption control of the arithmetic device included in the apparatus and detailed control and return control of the power saving state by software. Become.

  In the above embodiment, the power saving control of the image processing apparatus has been described as an example. However, the above embodiment is merely an example, and even if it is not an image processing apparatus, an arithmetic device such as the CPU 10 controls the device by performing arithmetic operations according to a program loaded in a volatile storage medium such as the RAM 20. The same applies to any electronic device to be used.

1 Image forming apparatus 10 CPU
11 RAM
11a Text area 11b Static area 11c Dynamic area 12 ROM
13 Network I / F
14 Serial port I / F
15 Memory card I / F
16 Image input I / F
17 Image output I / F
20 Controller 21 ADF
22 Scanner unit 23 Paper discharge tray 24 Display panel 25 Paper feed table 26 Print engine 27 Paper discharge tray 30 Main control unit 31 Engine control unit 32 Input / output control unit 33 Image processing unit 34 Operation display control unit 41 Main control unit 42 Energy saving control Unit 43 Energy Saving Control Unit 44 State Transition Determination Table

JP 2007-047966 A

Claims (4)

An information processing apparatus that performs power saving control by restricting power supply to each part of the apparatus,
A power-saving state control unit configured to perform a device control in a power-saving state in which the power supply is limited, and is configured by an arithmetic device performing an operation according to a program read to a storage medium;
A power saving control unit that controls transition to the power saving state,
The power saving control unit controls to reduce the clock frequency of the arithmetic device upon transition to the power saving state,
The power saving state control unit is information stored in a storage area accessible by the arithmetic device in a state where the clock frequency is reduced in a storage area of the storage medium, the state of the information processing apparatus and Refers to information associated with a combination of an event that has occurred in the information processing apparatus and a state to be changed thereafter, and in a power saving state based on the state of the information processing apparatus and the event that has occurred in the information processing apparatus An information processing apparatus that controls state transition of the information processing apparatus.   The storage area of the storage medium that can be accessed by the arithmetic unit in a state where the clock frequency is reduced is the storage area that is referred to by the program while the program is being read to the storage medium. The information processing apparatus according to claim 1, wherein the information processing apparatus is an area for storing information that is continuously stored at a fixed position in a storage area of the medium. A control method for an information processing apparatus that performs power saving control by restricting power supply to each part of the apparatus,
The arithmetic device performs an operation according to the program read to the storage medium, thereby performing device control in the power saving state in which the power supply is limited,
Upon transition to the power saving state, control to reduce the clock frequency of the arithmetic device,
In the power saving state, information stored in a storage area accessible by the arithmetic unit in a state where the clock frequency is reduced in the storage area of the storage medium, the state of the information processing apparatus and the information The information in the power saving state based on the state of the information processing device and the event that has occurred in the information processing device with reference to information associated with the combination of the event that occurred in the processing device and the state to be changed thereafter A control method for an information processing apparatus, characterized by controlling state transition of the processing apparatus. A control program for an information processing device that performs power saving control by restricting power supply to each part of the device,
Controlling to reduce the clock frequency of the arithmetic device upon transition to the power saving state where the power supply is limited;
Detecting an event that has occurred in the information processing apparatus in the power saving state;
In the power saving state, information stored in a storage area accessible by the arithmetic unit in a state where the clock frequency is reduced in the storage area of the storage medium, the state of the information processing apparatus and the information The information in the power saving state based on the state of the information processing device and the event that has occurred in the information processing device with reference to information associated with the combination of the event that occurred in the processing device and the state to be changed thereafter A control program for an information processing device, causing the information processing device to execute a step of controlling state transition of the processing device.

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