JP2013232083A - Information processing device, information processing method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably suppress the occurrence of data loss in a system where USB charging is possible.SOLUTION: This information processing device comprises: a processor that controls a system; and a control unit that does not permit USB charging to charge another device when the residual capacity of a battery is equal to or less than a predetermined value in a state where the processor is turned off. This configuration makes it possible to reliably suppress the occurrence of data loss in a system where USB charging is possible.

Description

  The present disclosure relates to an information processing apparatus, an information processing method, and a program.

  Conventionally, in an information processing apparatus such as a personal computer (PC), states such as suspend (standby) and hibernation are set in addition to a normal power-on state. For example, Patent Document 1 below describes a technique that enables a timer Wake when EC is turned off at S4 / S5.

  Patent Document 2 describes a method for reducing the amount of read / write data in hibernation performed by the BIOS.

JP 2011-204168 A JP 2001-92627 A

  Recently, when a battery is consumed during high-speed charging (USB charging) for a device connected via USB to a PC, the information written in the memory is lost, and so-called data loss occurs. End up.

  Therefore, it has been demanded to reliably prevent the occurrence of data loss in a system capable of USB charging.

  According to the present disclosure, a processor that controls the system of an information processing device and USB charging that charges another device when the remaining battery capacity is equal to or less than a predetermined value when the power of the processor is turned off. There is provided an information processing apparatus including a non-permitted control unit.

  The control unit may not permit the USB charging when the remaining capacity of the battery is 30% or less.

  The control unit may not permit the USB charging when an AC power source is not connected.

  The controller may permit the USB charging when an AC power source is connected.

  Further, the control unit may execute a hibernation process of writing memory information to a storage device when a predetermined time has elapsed after the USB charging is not permitted.

  In addition, after the USB charging is not permitted, the control unit executes a hibernation process for writing memory information to a storage device when the remaining capacity of the battery is equal to or less than a second predetermined value. There may be.

  Further, according to the present disclosure, it is determined whether the power of the processor that controls the system of the information processing device is turned off, and the remaining capacity of the battery is a predetermined value in the state where the power of the processor is turned off. In the following cases, a method for controlling an information processing device is provided, which includes disabling USB charging for charging other devices.

  Further, according to the present disclosure, the means for determining a power-off state of the processor that controls the system of the information processing apparatus, and the remaining capacity of the battery is equal to or less than a predetermined value when the power source of the processor is off In this case, a program for causing a computer to function as means for disabling USB charging for charging other devices is provided.

  According to the present disclosure, it is possible to reliably suppress the occurrence of data loss in a system capable of USB charging.

It is a schematic diagram which shows the structure of a general PC. It is a schematic diagram which shows the whole structure of the information processing apparatus which concerns on each embodiment. It is a schematic diagram which shows the specific structure of the information processing apparatus which concerns on 1st Embodiment. It is a schematic diagram which shows the other example of the specific structure of the information processing apparatus which concerns on 1st Embodiment. It is a schematic diagram for demonstrating the effect of 1st Embodiment. It is a schematic diagram which shows the example of the power supply stop state return by RTC. It is a schematic diagram which shows the example of the power supply stop state return by RTC. It is a schematic diagram which shows the example of the power supply stop state return by RTC. It is a schematic diagram which shows the example of the power supply stop state return by RTC. It is a schematic diagram which shows the example of the power supply stop state return by RTC. It is a schematic diagram which shows the example of the power supply stop state return by RTC. It is a schematic diagram which shows management of on / off of the power supply of the device by EC. It is a schematic diagram which shows management of on / off of the power supply of the device by EC. It is a schematic diagram which shows management of on / off of the power supply of the device by EC. It is a schematic diagram which shows the structure of a processor, a chip set (PCH), EC, and memory. It is a schematic diagram which shows the modification of the structure of FIG. FIG. 17 is a schematic diagram illustrating an example in which a hardware (HW) switch 150 is provided instead of the dedicated circuit in FIG. 16. 15 is a schematic diagram showing an example in which another device (Any Devices) 160 is provided instead of the memory 109 in FIG. It is a schematic diagram which shows the structure applied to applications other than power supply control. It is a schematic diagram which shows the mounting specification of each state in 3rd Embodiment. It is a schematic diagram which shows the discharge characteristic at the time of S3 and S0. It is a characteristic view which shows the threshold value of LBH. It is a characteristic view which shows timer hibernation. It is a flowchart which shows the process of LBH. It is a flowchart which shows a process of Timer Hib. It is a timing chart which shows a temporary stop mechanism. It is a timing chart which shows a temporary stop mechanism. It is a schematic diagram which shows a Hibernation load. It is a characteristic view which shows the load-capacity characteristic of the information processing apparatus which is low capacity | capacitance and high performance. It is a flowchart which shows the process of a hybrid sleep function. It is a flowchart which shows a process of a battery sleep disable. It is a block diagram which shows the process of 3rd Embodiment. It is a block diagram which shows the process of 3rd Embodiment. It is a block diagram which shows the process of 3rd Embodiment. It is a block diagram which shows the process of 3rd Embodiment. It is a block diagram which shows the process of 3rd Embodiment. It is a block diagram which shows the process of 3rd Embodiment. It is a flowchart which shows the process of 4th Embodiment. It is a flowchart which shows the process of 4th Embodiment.

  Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

The description will be made in the following order.
1. Prerequisite technology First embodiment 2.1. Example of overall configuration of apparatus 2.2. 2. Specific configuration example of apparatus Second Embodiment 3.1. Operation of the second embodiment 3.2. Management of power on / off of device by EC 3.3. 3. Configuration example of second embodiment Third Embodiment 4.1. Overview of USB charging 4.2. About the precaution against data loss 4.3. About data lost countermeasures according to this embodiment 4.4. Hybrid sleep function 4.5. Battery sleep disable 4.6. 4. Processing of the third embodiment Fourth embodiment

1. Premise technology Recently, mobile devices called smartphones and tablets have been used in addition to personal computers (PCs) as terminals to connect to the Internet, such as email and web.

  These mobile devices have a relatively low processing capacity compared to a PC, but are lighter than a PC, have a long battery life, and are suitable for carrying. In general, the mobile device is set in a standby state when the user does not use it, and is configured to immediately return from the standby state when the user wants to use the device.

  On the other hand, PCs are generally shut down (powered off) when devices are not used, but there are also solutions such as suspend, hibernation, and InstantOn. FIG. 1 is a schematic diagram showing a configuration of a general PC 100. As shown in FIG. 1, a PC 200 includes a processor (CPU (Central Processing Unit)) 202, a chipset 204, an EC (Embedded Controller) 206, a memory (DRAM) 209, an LCD (Liquid Crystal Display), a liquid crystal display device, 1, a storage device 220 such as an HDD (Hard Disk Drive), and a battery 222.

  The chip set 204 is a chip that manages the exchange of data between the CPU 202 and various devices such as the storage device 220 and the LCD within the information processing apparatus 200. As shown in FIG. 1, the chipset 204 includes a north bridge 208 and a south bridge 210. The north bridge 208 includes a memory controller 212 that controls the memory 209. The south bridge 210 includes an RTC (Real Time Clock) 214 that is a chip dedicated to timekeeping. Unlike the chips on other motherboards, the RTC 214 operates by receiving power from the built-in battery while the power is turned off (received from an external power source while the power is on). The OS (operating system) obtains the date and time from the RTC 214 at the time of startup, and thereafter, the OS measures the time independently. The EC 206 executes power supply control of the PC 200, and is configured by, for example, an LSI (Large Scale Integration Circuit).

  Hereinafter, each state such as suspend, hibernation, InstantOn, EC off, etc. will be described.

<Suspend>
Suspend is also referred to as S3 (state) in the ACPI (Advanced Configuration and Power Interface) standard. Suspend is also referred to as standby or sleep. Suspend holds the data in memory 209 while
This is a standby state in which the power consumption of the entire system can be reduced and the operating state can be quickly restored by turning off or stopping devices such as the processor 202, the storage device 220, and the LCD. In the suspend mode, the memory 209 holds data in a state where the OS is activated. Therefore, when the OS is restored, the OS is not restarted and returns to the state before the suspension.

In the suspended state, power is supplied to the memory 209 in order to hold the data in the memory 209. During suspension, the memory 209 is self-refreshed (Self
The state is called “Refresh”. Self refresh is a mode in which the clock is deactivated to reduce the power consumption of the device and the refresh operation is automatically executed using an internal refresh counter. Self-refreshing is effective when data must be retained but the device is not accessed for a long time.

  In the suspend mode, the power consumption is relatively large as compared with the state where the entire system is turned off (S5 of the ACPI standard). Further, in the suspend mode, when the power supply is cut off, such as when a power failure occurs or when the remaining battery level is exhausted, the data in the memory 209 is lost and the data cannot be restored.

<Hibernation (S4, also called hibernation)>
The hibernation function saves (saves) the contents of the memory 209 in the storage device 220 such as an HDD immediately before turning off the power of the system, restores the contents of the memory 209 with the contents saved in the storage device 220 at the next startup, and returns. It is. Hibernation is also referred to as S4 in the ACPI standard.

  Hibernation has the advantage that it consumes less power than suspend because the system can be completely powered off. On the other hand, in hibernation, since the contents of the memory 209 are saved and restored in the storage device 220, a relatively long time is required for transition and restoration.

  In order to shorten the transition / restoration time of hibernation, it is effective to reduce the amount of read / write data with respect to the storage device 220 as much as possible. As described above, Patent Document 2 describes a method for reducing the amount of read / write data in hibernation performed by the BIOS.

<InstantOn>
InstantOn is an OS that is prepared separately from a normal OS that can use all the functions of the system and that starts up in a short time with limited functions. A normal OS or InstantOn is selected as an OS to be started according to a user instruction.

  Since InstantOn uses an OS different from a normal OS, restarting is required to switch the OS. In addition, work cannot be continued across these OSs.

<EC off>
The EC 206 is responsible for managing the power state of the system. The state where the EC 206 is turned off (OFF) corresponds to the ACPI standard S5 and is a state where the entire system is turned off. As described above, suspend (S3, standby) is different from power off (S5), and it is necessary to maintain power supply to the memory 209 of the system. For this reason, in the case of the general PC 200 shown in FIG. 1, the EC 206 cannot be turned off during the suspension.

<Hybrid Sleep>
A combination of S3 (standby) and hibernation, and a hibernation image (Hib Image) is created on the storage device 220 simultaneously with the transition to standby. Although the transition time for creating a hibernation image is longer than that for the standby mode, the transition to the standby mode is fast, so the return to S0 is quick. Further, unlike standby, even if the power is lost, it is possible to recover from the hibernation image on the storage device 220. In addition, Hybrid Sleep is introduced as a function of Windows (registered trademark) Vista.

  As described above, in the PC 200, recovery from the standby state is realized by a solution such as suspend, hibernation, and InstantOn. Here, as described above, since the EC 206 cannot be turned off in the suspend state, there is a problem that power consumption increases. In hibernation, there is a problem that a relatively long time is required for transition / return time.

  Therefore, in the following, each embodiment will be described focusing on an embodiment related to reducing power consumption of the entire system during suspension and an embodiment related to reducing transition time in hibernation.

2. First Embodiment [2.1. Example of overall device configuration]
The first embodiment relates to a technique for turning off an EC power supply in order to reduce power during suspend (standby). By turning off the EC power supply, power during standby can be greatly reduced. Power supply to the memory is controlled by GPIO
Use the Expander. It is possible to maintain the output level of the suspended memory by collecting the signals that need to be controlled in the GPIO Expander and supplying only the power of the GPIO Expander.

  First, a schematic configuration of the information processing apparatus 100 according to the first embodiment of the present disclosure will be described with reference to FIG. FIG. 2 is a schematic diagram illustrating the overall configuration of the information processing apparatus 100 according to each embodiment described below. An example of the information processing apparatus 100 is a notebook personal computer (PC), but is not limited to this. As shown in FIG. 2, the information processing apparatus 100 includes a processor 102, a chip set (PCH: platform controller hub) 104, an EC 106, a memory 109, a GPIO expander IC (GPIO Expander) 110, a charge control IC 112, and a USB port. 114, a storage device (SSD or HDD or the like) 116, an access LED 118, and a BIOS ROM 119. The information processing apparatus 100 includes a keyboard 120, a battery 122, a power button 124, and a power LED 126.

  In the information processing apparatus 100 according to the present embodiment, unlike the PC 200 of FIG. 1, the chipset 104 is not composed of the north bridge 208 and the south bridge 210, and the processor 102 includes the function of the north bridge 208. Yes. That is, the north bridge 208 in FIG. 1 is integrated with the processor 102. For this reason, the processor 102 includes a memory controller 110 that controls the memory 109. The chip set 104 is mainly composed of the south bridge 210 of FIG. The chip set 104 includes an RTC (Real Time Clock) 114 that is a chip dedicated to timing. The EC 106 includes an alarm timer 107.

[2.2. Specific configuration example of device]
FIG. 3 is a schematic diagram illustrating a specific configuration of the information processing apparatus 100 according to the first embodiment. FIG. 3 mainly shows the memory 109 and the components that supply power to the memory 109.

The EC 106 is operated by two power supply systems (VCC1 / VCC2). The GPIO Expander 110 uses a power supply corresponding to the power supply VCC1 of the EC 106. In the suspend (S3), in order to hold the data in the memory 109, the output levels of the two signals (MEMORY_ON / RST_ON) supplied to the memory 109 are kept. MEMORY_ON is a signal for controlling the power source of the memory 109, and RST_ON / EC_ON is a signal for controlling a reset signal of the memory 109. These signals are the VCC1 operating part of EC106 or GPIO.
Supplied from the Expander 110.

  In the present embodiment, the power supply VCC2 of the EC 106 is turned off in the suspend (S3). As a result, most of the functions of the EC 106 are turned off. On the other hand, the power supply VCC1 of the EC 106 is not turned off even in the suspend state, and the power is supplied to the GPIO Expander 110 even in the suspend state.

  As a result, the GPIO Expander 110 is turned on with most of the EC 106 turned off, and a signal to the memory 109 can be continuously sent. By turning off most of the functions of the EC 106 during suspend, power consumption can be significantly reduced.

  In the example shown in FIG. 3, the power supply VCC1 is provided in the EC 106, but the power supply VCC1 may be provided separately from the EC 106. As a result, the EC 106 can be completely turned off during the suspend.

  In the configuration shown in FIG. 3, since the power supply + VCONT of the memory controller 110 is turned off during standby, the CONT_ON by the power supply VCC2 of the EC 106 does not need to keep the output level.

  As described above, in this embodiment, the power supply of the EC 106 that executes control of power supply to the system is turned off during standby when the power of the processor 102 that controls the system is turned off, and separately from the EC 106 during standby. The provided GPIO Expander 110 supplies power to the memory 109 that stores information. The configuration for realizing this processing can be configured by hardware (circuit) or a central processing unit such as a CPU and a program for causing this to function.

  FIG. 4 is a schematic diagram illustrating another example of a specific configuration of the information processing apparatus 100 according to the first embodiment. In the example shown in FIG. 4, an external latch circuit 130 is provided instead of the GPIO Expander 110. The external latch circuit 130 uses a power supply corresponding to the power supply VCC1 of the EC 106 in the suspend state. In the configuration shown in FIG. 4 as well, the power supply VCC2 of the EC 106 can be turned off during the suspend similarly to the configuration shown in FIG. 3, so that the power consumption in the suspend can be greatly reduced.

  FIG. 5 is a schematic diagram for explaining an example of the effect of the first embodiment. As shown in FIG. 5, in the PC 200 of FIG. 1, the power consumption of the EC 206 at the time of suspend (Standby) is 200 [mW], whereas according to the configuration of the first embodiment, the EC 106 at the time of suspend is The power consumption can be reduced to 0 [mW]. Therefore, the power consumption of the entire information processing apparatus 100 ((Total)) can be reduced to 200 [mW], and 100 [mW] with respect to the total power consumption (300 [mW]) of the PC 200 in FIG. As a result, the usable period of the battery 122 after charging can be set to 15 days, which is 1.5 times longer than the 10 days of the PC 200 in FIG. Become.

  As described above, according to the first embodiment, the signals for maintaining the memory 109 at the time of suspend are collected in the GPIO Expander 110, and the power of the EC 106 is turned off at the time of suspend. Can be greatly reduced. Thereby, the holding period of the battery 122 can be extended significantly.

3. Second Embodiment 3.1. Operation of Second Embodiment Next, a second embodiment of the present disclosure will be described. The second embodiment relates to a technology that realizes the startup time with high accuracy when the EC and the chipset are powered off during suspension.

  The chip set 104 includes an RTC (Real Time Clock) 114. By turning off the power of the chipset (PCH) 104 (cutting off the Resume power supply), the function of the RTC 114 provided in the chipset 104 cannot be used. That is, power consumption can be reduced by turning off the power of the chipset 104, but there is a demerit that sacrifices the function of the RTC 214.

  Further, when the device power management by the EC 106 is necessary, the EC 106 needs to be turned on (ON). If the EC 106 is turned off, the power management cannot be performed. However, if the EC 106 is turned on, the power consumption increases.

  On the other hand, the information processing apparatus 100 has an RTC Wake function. RTC Wake is a function in which the chipset 104 starts itself at a predetermined time. The RTC Wake function is set by a user instruction or OS and enabled by the BIOS. By using the RTC Wake function, the processor 102 can be turned on only for a necessary period. However, in order to use the RTC Wake function, the power of the chipset 104 needs to be turned on. The BIOS is a group of programs for controlling peripheral devices such as the EC 106 and the storage device 116 connected to the processor 102 and the chipset 104. The basic input / output unit for these devices is used for the OS and application software. To provide. The BIOS is stored in the BIOS ROM 119.

In the second embodiment, when the RTC wake is set by the OS, the same setting is made on the EC 106 by the BIOS. The EC 106 turns on the power of the chipset 104 a predetermined time before the date and time set by the RTC wake (for example, several seconds before). In the chipset 104, the RTC is set at the set date and time.
A wake interrupt occurs and the system starts up. According to such a configuration, the EC 106 and the chip set 104 can be turned on only when necessary, and the power consumption can be significantly reduced.

  Hereinafter, based on FIG. 6 to FIG. 11, an example of power supply stop state return by RTC according to the present embodiment will be described. The configuration for realizing this processing can be configured by hardware (circuit) or a central processing unit such as a CPU and a program for causing this to function. Here, an example of return from S5 (shutdown) will be described, but the present invention can be similarly applied when returning from another power stop state. FIG. 6 is a schematic diagram showing signals exchanged between the processor (CPU) 102, the chipset 104, and the EC 106, and the power on / off state. In FIGS. 6 to 11, regions with dots indicate that the power is off (OFF), and regions without dots indicate that the power is on (ON).

  As described above, the chip set 104 has the RTC 114. The EC 106 also has a unique timer 107.

When RTC Wake is set in the chipset 104, the RTC Wake is set in the chipset 104 at the set date and time.
A wake interrupt occurs, the processor 102 is powered on, and the system is activated.

As shown in FIG. 6, when the RTC Wake is set, the BIOS 103 operating on the processor 102 is
Information about the date and time of activation by Wake (Wake) is acquired from the chipset 104. The BIOS 103 activates the EC 106 based on the information acquired from the chipset 104 (RTC).
(date and time similar to wake) is set. The EC 106 sets its own timer 107 (Alarm Timer) so as to start up a predetermined time before the set date and time. Here, the predetermined time depends on the accuracy of the timer 107 of the EC 106, and the RTC
Depending on the margin until the wake is activated, the EC 106 is set to a time when the activation of the EC 106 can surely precede the RTC Wake. The predetermined time is set to an arbitrary value such as 1 second, 5 seconds, 1 minute, and 5 minutes.

  As shown in FIG. 7, when the system transitions to S5 with the RTC Wake set, the power of the processor 102, the chipset 104, and the EC 106 is turned off (OFF), and only the timer 107 in the RTC 114 and the EC 106 is used. Power is supplied.

Next, as shown in FIG. 8, the EC 106 is activated based on the time set in the timer 107 several seconds before the date and time when the chip set 104 should be restored by the RTC Wake. This is because, as mentioned above, RTC
This is because when the Wake date and time is set, the timer 107 of the EC 106 is set so as to start slightly before the set date and time.

Next, as shown in FIG. 9, the restored EC 106 supplies power to the chip set 104. At this time, the RTC Wake time set in the RTC 114 has not been reached, and the timer of the RTC 114 has not expired. Then, when power is supplied to the chipset 104, the RTC is electrically
The environment where wake is possible is prepared.

Next, as shown in FIG. 10, several seconds after the EC 106 is activated, the RTC 114 inside the chipset 104
Timer expires and an RTC wake interrupt occurs.

  Thereafter, as shown in FIG. 11, after the RTC wake is generated, the system transits to S0 through a normal return path. As a result, power is turned on to the chipset 104 and the processor 102.

The EC 106 operates only to create an environment where RTC wake can be realized, and after turning on the chipset 104, the RTC wake
The system is automatically activated by wake and reaches S0. For this reason, in this embodiment, the system transitions to S0 and starts up (Wake) by the actual RTC wake mechanism. Therefore, compared with the case where the EC 106 as described in Patent Document 1 is used as a substitute for the RTC 114, it is possible to start up accurately with respect to the time of the RTC 114 (system time).

  As a result, even when the accuracy of the external timer such as the timer 107 is low and the time is shifted with respect to the time of the RTC 114, the EC 106 is started sufficiently early so that the system is accurately started according to the time of the RTC 114. can do. Therefore, for example, even when performing TV recording, recording can be performed accurately in accordance with the time of the TV program based on the time of the RTC 114. In addition, it becomes easy to notify that the RTC 114 has returned (Resume) in terms of OS or BIOS. Therefore, an operation intended at the time intended by the user is possible.

According to the examples shown in FIGS. 6 to 11, even if the power of the chipset 104 is shut off, the user can
If a wake is intended, a wake operation using the RTC 114 can be performed correctly. Accordingly, it is possible to support RTC wake by the RTC 114, and it is not necessary to emulate the RTC wake using a device other than the RTC 114 such as the EC 106. Therefore, it is possible to further improve the accuracy of the system startup time.

Since startup is performed by RTC wake compared to emulation using an external device, an error in startup time when viewed from the OS can be suppressed. The OS is RTC
It is possible to easily detect that a wake has occurred.

In the case of a normal RTC wake, it is assumed that the RTC 114, the chipset 104, and the EC 106 are powered on. In this embodiment, RTC
Since the EC 106 is activated immediately before the wake, the power of the chip set 104, the RTC 114, and the EC 106 can be turned off until immediately before that. Therefore, power consumption can be greatly reduced.

3.2. Management of Device Power On / Off by EC Next, device power on / off management by the EC 106 will be described with reference to FIGS. When the power management of the device by the EC 106 is necessary, it is necessary to turn on the power of the EC 106, which increases power consumption. For this reason, in the example described below, an alarm timer (Alarm
(Timer) 107 is used to turn on the power of the EC 106 only at the moment when an actual operation of device power management (monitoring, power ON / OFF, etc.) is necessary. In other periods, the EC 106 is turned off. Thereby, reduction of power consumption is realizable. Also in FIGS. 12 to 14, a region with dots indicates a state in which the power is off (OFF), and a region without dots indicates a state in which the power is on (ON).

Here, it is assumed that the EC 106 manages the power supply of the main memory 109. As shown in FIG. 12, the EC 106 has its own alarm timer (Alarm).
The date and time when the power of the memory 109 is turned off is set in (Timer). At this time, it is recorded that the memory power is turned off at the next startup.

  Then, as shown in FIG. 12, the power of the processor 102 and the EC 106 is turned off while the power of the memory 109 is on.

Thereafter, as shown in FIG. 13, while the EC 106 and the processor 102 are powered off (OFF), the EC 106 alarm timer (Alarm
Timer) expires and the power of the EC 106 is turned on.

Then, as shown in FIG. 14, the EC 106 performs a power management operation of the main memory. EC106 has its own alarm timer (Alarm
Since the date and time for turning off the power of the memory 109 is set in (Timer), the EC 106 turns off the power of the main memory 109 after its own power is turned on.

  According to the examples shown in FIGS. 12 to 14, it is not necessary to always turn on the EC 106 for power management of the device. As a result, the EC 106 can be turned off in situations where the EC 106 needs to manage the power of any device.

3.3. Configuration Example of Second Embodiment Next, a specific configuration for performing the operation of the above-described second embodiment will be described. FIG. 15 is a schematic diagram showing the configuration of the processor 102, the chip set (PCH) 104, the EC 106, and the memory 109. Power is supplied to each of the chip set 104 and the RTC 114. PCH Power is supplied to the chipset 104, and RTC Power is supplied to the RTC 114. Further, power is supplied to each of the EC 106 and the timer 107. EC power is supplied to the EC 106, and BAT Power is supplied to the timer 107. The processor 102 is supplied with power (CPU power).

  As shown in FIG. 15, the power sources of the timer 107, the RTC 114, the chip set 104, the processor 102, the EC 106, and the memory 109 are separated, and are made controllable. The power supply other than the RTC 114 and the timer 107 is configured to be capable of ON / OFF control by the EC 106. According to the configuration shown in FIG. 15, the timer 107 can be operated even when the EC 106 is not activated. Further, the RTC 114 can be operated even when the chipset 104 is not activated.

  FIG. 16 is a schematic diagram showing a modification of the configuration of FIG. In the example shown in FIG. 15, the timer 107 is built in the EC 106. However, as shown in FIG. 16, a dedicated circuit 140 having the same function as the timer 107 may be provided outside. In this case, the dedicated circuit 140 causes the EC 106 to generate an activation request (Wake UP Request) interrupt signal.

  FIG. 17 shows an example in which a hardware (HW) switch 150 is provided instead of the dedicated circuit 140 of FIG. As described above, the EC 106 can be activated by a trigger other than the timer 107. As shown in FIG. 17, when the HW switch 150 generates an activation request interrupt signal, the EC 106 is turned on, and the power management of the device can be performed.

  FIG. 18 is a schematic diagram illustrating an example in which another device (Any Devices) 160 is provided in place of the memory 109 in FIG. In addition to the memory 109 (DRAM), any device capable of controlling power in the EC 106 can control power with the same configuration.

  FIG. 19 is a schematic diagram showing a configuration applied to applications other than power supply control. In FIG. 19, the device 170 is controlled by the EC 106 other than the power control. When it is desired to periodically control another device 170, the EC 106 can be powered off (OFF) while the device 170 is not controlled. In this way, even when performing control other than power control, it is possible to reduce power consumption by turning on the EC 106 only when necessary.

4). Third Embodiment 4.1. Overview of USB Charging Next, a third embodiment of the present disclosure will be described. The third embodiment relates to a technology for connecting the information processing apparatus 100 and another apparatus and charging the other apparatus. In this embodiment, USB charging (USB
(Charge) will be described as an example.

  USB Charge is defined by Battery Charging Specification (hereinafter referred to as BCS), which is a quick charging standard using BUS Power developed by USB-IF. The latest version of BCS is Ver.:Revision 1.2 (2010/12/7 release). Conventional USB BUS power can only supply power up to 500 [mA] (900 [mA] for USB 3.0) at a voltage of 5 [V] ± 5%. ] Power can be supplied up to 1.5 [A] at a voltage of ± 5%.

The definition of the USB Charge port will be described. The BCS defines the following three types of ports.
1. SDP: Standard Downstream Port
It is a normal USB port and can communicate with other devices, VBUS
It is possible to supply up to 500 [mA].
2. DCP: Dedicated Charging Port
MAX 1.5 [A] can be supplied from VBUS. Communication is not possible.
3. CDP: Charging Downstream Port
MAX 1.5 [A] can be supplied from VBUS and communication is possible.

  Basically, the connected device can be charged only during S0. However, by changing the port setting of each state, the device can be charged even in the state of S3 or lower. Here, the device connected to the information processing apparatus 100 and charged by USB is a device such as a smartphone or a digital camera. Some devices automatically pull VBUS even during S3.

  Furthermore, in the suspended state, power could only be supplied up to 2.5 [mA], but DCP / CDP can supply up to 100 [mA], and the battery of the device to be charged is completely empty. Even so, it can be recovered quickly.

FIG. 20 is a schematic diagram illustrating an example of mounting specifications of each state in the information processing apparatus 100 according to the present embodiment. Here, default (Default) and two types of Charge
A mode is assumed. Default is a setting at the time of shipment, which is the same setting as a normal USB Port, and S0 and S3 are SDP. In the charge mode, S0 is CDP and DCP is a state other than S0 with respect to the default. Therefore, rapid charging is possible in all states.

  As described above, with DCP and CDP, it is possible to quickly charge a device connected to the information processing apparatus 100. On the other hand, since power consumption increases during quick charging, the remaining amount of the battery 122 may be empty when the information processing apparatus 100 is not connected to an AC power source. In particular, if the remaining amount of the battery 122 becomes empty while data is being written to the storage device 116 by hibernation, the data may be lost.

For this reason, in the present embodiment, the USB charge is temporarily stopped under a predetermined condition, so that the data lost (Data
(Lost) is suppressed.

4.2. Assuming data loss countermeasures First, the assumptions regarding data loss countermeasures are explained. When an AC power source is connected to the information processing apparatus 100, the connected device can be reliably charged without causing data loss. On the other hand, the USB is not connected to the information processing apparatus 100 (during DC driving).
When the charge is performed, there is a possibility that the remaining amount of the battery 122 is used up and the information displayed on the screen of the information processing apparatus 100 and the data stored in the memory 109 may be lost.

For this reason, as a precaution against data loss, low battery hibernation (Low
Battery Hibernation (hereinafter also referred to as LBH) and timer hibernation (hereinafter also referred to as Timer Hib) will be described.

<Low battery hibernation (LBH)>
In LBH, when the remaining amount of the battery 122 falls below a certain threshold at S0 or S3, the image is written in the storage device 116, and the process proceeds to S4. At S3, the process starts at S0 and writes to the storage device 116. FIG. 21 is a schematic diagram showing the discharge characteristics at S3 and S0. FIG. 22 is a characteristic diagram showing the threshold value of LBH. As shown in FIG. 21, since the discharge characteristic at S3 and the discharge characteristic at S0 are different, different threshold values are set at S3 and S0 in consideration of this. At this time, because of the characteristics of the battery, (LBH threshold value at S0) <(LBH threshold value at S3), there is an area where the user cannot enter from S0 to S3. For example, the S0 LBH threshold is 5% of the remaining battery power.
If the LBH threshold value of S3 is set to 30% and the transition is made to S3 with the remaining battery level at S0 being 25%, the LBH is executed, so the transition is made to S4.

  The amount of power consumed during USB charging is larger than that of normal USB communication, and in LBH, the battery 122 may become empty during the creation of the Hib Image. In this case, data loss occurs.

<Timer hibernation>
FIG. 23 is a characteristic diagram showing timer hibernation, where the vertical axis indicates the remaining battery level and the horizontal axis indicates time. In the timer hibernation, when DC driving is performed, if one hour has passed after the transition to S3, the process starts (wakes) at S0, writes an image to the storage device 116, and then transitions to S4.

  In the timer hibernation, the remaining amount of the battery 122 may be emptied during the timer period of one hour. Also, in timer hibernation, it must be started once at S0 in order to create a Hib Image. For this reason, it takes much more time for image creation than for low battery hibernation, and the possibility that the battery will be emptied becomes higher.

FIG. 24 is a flowchart showing LBH processing. FIG. 24 shows an example in which LBH is activated during S0. In step S12, if the remaining battery level is 5% or less, the process proceeds to step S14 and Hib
An image is created and the process proceeds from S0 to S4. As described above, the power consumption of USB Char is large, and during USB charging, power is consumed even at steps S12 and S14.
The battery 116 may be emptied during image creation.

FIG. 25 is a flowchart showing the processing of Timer Hib. Timer
Hib is activated only during S3. In step S22, a transition is made from S0 to S3, and the timer of the RTC 114 starts. In step S24, it is determined whether or not the timer has exceeded 1 hour. If the timer has exceeded 1 hour, the process proceeds from S3 to S0 in step S26. If the timer is less than 1 hour, the process returns to step S24. In step S28, Hib
Image is created and the process proceeds from S0 to S4. As described above, since it is necessary to once start (wake) the S0 in order to create the Hib Image, it takes more time than the LBH to create the Image, and the battery 122 is more likely to be emptied.

4.3. Regarding Data Loss Countermeasure According to the Present Embodiment In view of the above, a USB Charge temporary stop mechanism will be described as a data lost countermeasure according to the present embodiment. FIG. 26 is a characteristic diagram showing the temporary stop mechanism, in which the vertical axis indicates the remaining capacity of the battery 122 and the horizontal axis indicates time.

The temporary stop mechanism temporarily stops the power supply by USB charging when the remaining battery level is 30% during USB charging in S3 (characteristic 1). When a predetermined time elapses after the power supply is stopped, at time t2, Timer
Hib is activated.

Note that the characteristic 2 in FIG. 26 indicates that one hour elapses after the transition to S3 when the USB charging is not performed in S0, and the Timer at time t2
The case where Hib is activated is shown.

  Characteristic 3 shows a case where the capacity of the battery 122 becomes 5% or less during USB charging at S0. In this case, LBH is activated at time t1.

The temporary stop condition is during DC drive, during S3, and the remaining battery capacity is 30%
And below. Therefore, in the characteristics 2 and 3 in FIG.

  FIG. 27 is a flowchart showing the temporary stop mechanism. The configuration for realizing this processing can be configured by hardware (circuit) or a central processing unit such as a CPU and a program for causing this to function. First, in step S30, USB charging is enabled in the S0 state. In the next step S32, it is determined whether the drive is AC drive or DC drive. If the drive is AC drive, the process proceeds to step S34, and a transition from S0 to S3 / S4 / S5 is possible in a state where USB charging is possible. . In this case, USB charging is possible in S3 / S4 / S5.

  In the case of DC driving, the process proceeds to step S36, and the state change is determined. When transitioning to S4 / S5 (step S38), since there is no possibility of data loss, transition is made from S0 to S4 / S5 in a state where USB charging is possible. When the process proceeds to S3 (step S40), it is determined whether or not the remaining battery capacity exceeds 30%. If the remaining battery capacity exceeds 30%, the process waits in step S40. On the other hand, when the remaining battery level is 30% or less, the process proceeds to step S42, and the suspension condition is satisfied, so that the USB chargeable state is changed to the USB charge impossible state. As a result, USB charging to the device connected to the information processing apparatus 100 is stopped.

  Thereafter, when it is determined in step S44 that the power supply is connected to the AC power source, the process proceeds to step S46, and the state changes from the USB charge disable state to the USB charge enable state.

On the other hand, if it is not connected to the AC power supply in step S44, the process proceeds to the subsequent processes, and the LBH process (steps S12 to S16 in FIG. 24) or Timer.
Hib processing (steps S24 to S29 in FIG. 25) is performed.

Here, the remaining battery level 30% (Data
The reason for setting the threshold value (which does not cause the loss) will be described below. For example, when there are a plurality of models of the target information processing apparatus 100, the activation condition can be set to a uniform value for all models of the information processing apparatus 100. In this case, the trouble of setting the threshold value for each model can be saved. At this time, it is preferable to set the threshold value so as to cover a range from a high performance PC to a low battery capacity PC in the lineup.

First, in the lineup of models, the load of the battery 122 under the environment of a temperature of 20 ° C. is based on the load-capacity characteristic of the battery 122 in the information processing apparatus 100 having a low capacity and high performance (FIG. 29). -Calculate the threshold value from the capacity characteristics. Timer at S3
The electric power required until S0 is activated (waked) by Hib is about 10% of the capacity of the battery 122. Further, as shown in FIG. 28, the load (the power applied during the transition from S0 to S4) when the hibernation is turned on (ON) is about 15% of the battery capacity. FIG. 28 is a schematic diagram showing the load when the hibernation is turned on (the amount of decrease in the capacity of the battery 122 during hibernation) in each of a plurality of different USB loads. In addition, the margin considering the temperature characteristics is set to 5% of the battery capacity. Accordingly, it is desirable to set the remaining capacity of about 30% of the battery capacity as a threshold in total of 10% + 15% + 5%.

  If the threshold value is specified in units of [mWh], a relatively high threshold value is obtained in a model having a small battery capacity. For each model, a battery with a capacity that can handle the PC performance (load power) is selected. Therefore, to set a uniform threshold value for all models, the threshold unit is set to [%] and the specified value is set. It is preferable to decide.

As described above, according to the temporary stop mechanism according to the present embodiment, it is during DC driving, is in S3, and the remaining battery capacity is 30%.
Since the USB charge is temporarily stopped when the value is lower than, the loss of data can be reliably prevented.

4.4. Hybrid Sleep Function Next, an outline of the hybrid sleep function will be described as another data loss countermeasure. Here, the image is saved by hibernation by hybrid sleep or BIOS, and the power supply other than the memory 109 is turned off in the S3 state, thereby facilitating battery capacity retention during DC driving.

  Here, as described above, the “Hybrid Sleep” is an S3 state in which a Hib Image is created, and a hibernation image is created on the storage device 220 simultaneously with the transition to the standby.

FIG. 30 is a flowchart showing the process of the hybrid sleep function. As shown in FIG. 30, in the state where AC driving is not performed in the S0 state (step S50), when the transition to S3 is instructed (step S52), the state transits to Hybrid Sleep, and Hib
Image is created (step S60).

If it is determined in step S52 that the transition to S3 is not instructed, the process proceeds to step S54 to determine whether the remaining battery capacity exceeds 5%. If the remaining battery capacity is 5% or less, the process starts from S0. Transition to S4 and Hib
Image is created (step 56, S58).

As described above, according to the hybrid sleep function, Hib is entered at the timing of entering S3.
Since the image is created, it is possible to reliably prevent data loss.

4.5. Battery sleep disable (Batt Sleep)
About Disable Battery 122 sleeps when Battery Sleep is enabled and the battery charge / discharge current is below a certain current value and is not communicating with EC 106 for a certain period of time. Enter the mode. In this case, the CPU 123 of the battery 122 that detects the amount of current enters a sleep state. The release condition is when the EC 106 starts up the processor.

Measures are taken to prevent battery failure by disabling battery sleep during USB charging. Batt
If the sleep remains enabled, when the USB charging is started after entering the Batt Sleep, the CPU 123 is not activated and the current amount cannot be detected, and the FET generates heat.

  FIG. 31 is a flowchart showing a battery sleep disable process. FIG. 31 shows both the case where measures against battery sleep disable are taken (step S96 and later) and the case where measures are not taken (step S106 and later).

  Battery sleep disable is set regardless of whether or not connected to AC power (step S96) when power other than the memory is turned off in step S3 (step S92). In step S100, the battery is not in the sleep state, and the CPU 123 of the battery 122 is also activated. Therefore, when USB charging is performed (step S102), the occurrence of abnormal heat generation is reliably suppressed (step S104). The disable condition is that both the 1st / 2nd battery is disabled when the USB charging is on. To turn off USB charging, only the 2nd battery is disabled and the 1st battery is enabled.

  On the other hand, when the countermeasure for the battery sleep disable is not taken, in step S108, the battery 122 is in the sleep state and the CPU 123 is not activated. For this reason, when USB charging is performed in step S110, abnormal heat generation occurs.

4.6. Processing of the Third Embodiment Next, processing of the third embodiment will be described based on the block diagrams of FIGS. 32 to 37 show a state in which a device to be charged 300 that is USB-charged is connected to the information processing device 100. The charged device 300 includes a chip set 302, a battery 304, a power switch 306, and a USB connection unit 308. The configuration of the information processing apparatus 100 is the same as that of FIG. 2, but the CPU 123 of the battery 122 (not shown in FIG. 2) and a power switch (Power) for USB charging are not shown.
SW) 130 and USB connection unit 132 are shown. 32 to 37, it is shown that the power is not turned on to the components with dots.

FIG. 32 shows a state in which the USB charge is off at S0. In this state, all the components including the processor 102 and the chip set 104 are turned on. An image on the display screen (Image) exists on the processor 102, and the EC 106 monitors (monitors) the remaining amount of the battery 122. Port mode (Port) of the power switch 130 for the EC 106 to charge
mode). In FIG. 32, the port mode is SDP, and the charged device 300 can be supplied up to 0.5 [A].

FIG. 33 shows a state where the state transitions from S0 to S3 and the USB charge is off. In this state, the power of the processor 102 is turned off, and the image is written in the memory 109. In this state, when the power is turned off due to a decrease in the remaining amount of the battery 122, the power is not supplied to the memory 109, and thus the Image disappears. The EC 106 monitors the remaining amount of the battery 122. In the port mode, the SDP state is maintained, and the device can supply up to 0.5 [A].

  FIG. 34 shows a state in which the transition from S0 to S4 / S5 and the USB charging is off (OFF). In this state, almost all the components are turned off. At S4, the image is stored in the HDD 116. In this case, even if the power is turned off, the image is stored in the HDD 116, so the image is not lost. Since the EC 106 is powered off, the remaining amount of the battery 122 cannot be monitored. Further, the CPU 123 of the battery 122 enters a sleep state, and the port mode is turned off (OFF). Therefore, the charged device 300 is not charged.

FIG. 35 shows a state in which the USB charge is on in S0. In this state, all the components including the processor 102 and the chip set 104 are turned on. Image exists on the processor 102, and the EC 106 monitors (monitors) the remaining amount of the battery 122. The EC 106 controls the port mode (Port mode) of the power switch (Power SW) 130 for charging. The port mode is CDP and can supply up to 1.5 [A] to the charged device 300 to be charged. In addition, when the to-be-charged apparatus 300 does not support CDP, the supply is up to 0.5 [A].

FIG. 36 shows a state in which the state transitions from S0 to S3, and USB Charge is (ON). In this state, the power of the processor 102 is turned off, and the image is written in the memory 109. In this state, when the power is turned off due to a decrease in the remaining amount of the battery 122, the image disappears. The EC 106 monitors the remaining amount of the battery 122. The port mode is DCP and can supply up to 1.5 [A] to the device.

  FIG. 37 shows a state where the transition is made from S0 to S4 / S5 and the USB charge is on. When the USB charge is on (ON), the power supply of the EC 106 is maintained. At S4, the image is stored in the HDD. In this case, even if the power is turned off, the image is stored in the HDD 116, so the image is not lost. The EC 106 monitors the remaining amount of the battery 122. The CPU 123 of the battery 122 is not in the sleep state, and the port mode is DCP.

  As described above, according to the third embodiment, it is possible to reliably prevent data from being lost due to a decrease in the capacity of the battery 122.

5. Fourth Embodiment Next, a fourth embodiment of the present disclosure will be described. The fourth embodiment improves user convenience during BIOS hibernation.

<Cancellation of hibernation>
As described above, in hibernation, the contents of the memory 109 are saved (saved) in the storage device 116 such as an HDD immediately before the system is turned off. At this time, depending on the usage amount of the system memory 109 and the performance of the storage device 116, it may take time to write out the BIOS hibernation data, and the process cannot be interrupted. It may take a minute or more to write the data.

  For this reason, in this embodiment, an interrupt handler for the power button 124 is prepared in the BIOS, and hibernation is canceled when the power button 124 is pressed. If hibernation is canceled, hibernation data writing is interrupted and the system is returned to S0. The EC 106 detects that the power button 124 has been pressed and raises an interrupt to the system.

  Cancel is a function that, when the power button is pressed during writing out the BIOS hibernation data, stops writing and returns immediately. This function eliminates the need to wait until the BIOS hibernation data writing is completed when it is desired to return during the BIOS hibernation data writing operation, thereby improving the usability of the user.

  As will be described later, since the access lamp is turned off while the BIOS hibernation data is being written out, the user who wants to return is naturally guided to the power button 124 and can use the cancel function without being aware of it.

<Lamp off during hibernation>
During the writing of the BIOS hibernation data, the system state is S0 and the power LED (power lamp) 126 and the access LED (disk access lamp) 118 are lit. Therefore, the user needs to wait until these lights are turned off. is there. During this time, it is assumed that the user misidentifies as “Hybrid Sleep” by lighting or as if the memory dump is caused by some system error.

  For this reason, in this embodiment, a command I / F for overriding and controlling the lighting state of the power LED 126 and the access LED 118 between the BIOS 103 and the EC 106 is prepared. The BIOS 103 instructs the EC 106 to turn off the lamp before writing out the BIOS hibernation data.

  As described above, in this embodiment, the lamp is turned off in order not to make the user aware of the time taken to write out the BIOS hibernation data. As a result, even if the BIOS hibernation data is written a little longer, the user will not mistakenly assume that the system is frozen. Further, the user can be made aware that the user can return to S0 by pressing the power button 124 without making the user aware of the cancel function. That is, when the power LED 126 is turned off, it looks like an off state, and the user is naturally guided by pressing the power button 124 in order to turn on the power.

<Correspondence when frozen while writing hibernation data>
When the BIOS hibernation data writing is started, the power LED 126 and the access LED 118 are turned off. For example, when the system freezes during hibernation data writing, the user cannot recognize the state by lighting the lamp.

  For this reason, when the power button 124 is pressed, the EC 106 implements a function of ignoring the instruction to turn off the BIOS so that the process of intentionally turning off the lamp is not performed. If it is frozen, the lamp is lit without the system returning, so it is possible to inform the user of some abnormal state.

<About processing flow>
FIG. 38 is a flowchart showing the processing of this embodiment. First, in step S120, the BIOS 103 issues a command for instructing the EC 106 to turn off the lamp. Next, in step S122, the EC 106 overrides the lamp and turns off. Next, in step S124, writing processing to the storage device 116 is performed by hibernation. Next, in step S126, the EC 106 stops the lamp override.

  FIG. 39 is a flowchart showing the writing process. First, in step S130, the BIOS 103 writes part of the hibernation data. In the next step S132, it is determined whether or not the power button 124 has been pressed. If the power button 124 has been pressed, the process proceeds to step S134. In step S134, the EC 106 stops the lamp override, and in the next step S136, the system is returned.

  If the power button 124 is not pressed in step S132, the process proceeds to step S138, where it is determined whether or not writing of all data has been completed. If the writing has been completed, the process ends (RETURN). If the writing has not been completed, the process returns to step S130.

  As described above, according to the fourth embodiment, when the power button 124 is pressed, hibernation is canceled, so that user convenience can be improved. In addition, since the lamp is turned off before the BIOS hibernation data is written, even if the BIOS hibernation data is written a little longer, the user will not mistakenly assume that the system is frozen. Further, the user can recognize that it is in a state where the user can cancel with the power button 124 and return to S0.

  The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the technical scope of the present disclosure is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field of the present disclosure can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that it belongs to the technical scope of the present disclosure.

The following configurations also belong to the technical scope of the present disclosure.
(1) a processor for controlling the system of the information processing apparatus;
In a state where the power of the processor is turned off, when the remaining capacity of the battery is a predetermined value or less, a control unit that disallows USB charging for charging other devices;
An information processing apparatus comprising:
(2) The information processing apparatus according to (1), wherein the control unit does not permit the USB charging when a remaining battery capacity is 30% or less.
(3) The information processing apparatus according to (1), wherein the control unit does not permit the USB charging when an AC power source is not connected.
(4) The information processing apparatus according to (1), wherein the control unit permits the USB charging when an AC power source is connected.
(5) The information processing apparatus according to (1), wherein the control unit executes a hibernation process of writing memory information to a storage device when a predetermined time has elapsed after disabling the USB charging. .
(6) After the USB charging is not permitted, when the remaining capacity of the battery is equal to or less than a second predetermined value, the control unit executes a hibernation process for writing memory information to a storage device. The information processing apparatus according to (1).
(7) provided with an access lamp that is lit during writing of information to the storage device;
The information processing apparatus according to (5) or (6), wherein the access lamp is turned off while the information in the memory is written to the storage device by the hibernation process.
(8) Provide a power button to turn on the power,
The information processing apparatus according to (5) or (6), wherein the hibernation process is interrupted by an operation of the power button.
(9) determining a power-off state of a processor that controls the system of the information processing apparatus;
Disabling USB charging for charging other devices when the remaining power of the battery is below a predetermined value in a state where the power of the processor is turned off;
A method for controlling the information processing apparatus.
(10) Means for determining a state in which the power of the processor that controls the system of the information processing apparatus is turned off;
Means for disallowing USB charging for charging other devices when the remaining capacity of the battery is below a predetermined value in a state where the power of the processor is turned off;
As a program to make the computer function as.

100 Information processing apparatus 102 Processor 106 EC
122 battery

Claims (10)

A processor for controlling the system of the information processing apparatus;
In a state where the power of the processor is turned off, when the remaining capacity of the battery is a predetermined value or less, a control unit that disallows USB charging for charging other devices;
An information processing apparatus comprising:   The information processing apparatus according to claim 1, wherein the control unit disallows the USB charging when a remaining battery capacity is 30% or less.   The information processing apparatus according to claim 1, wherein the control unit disallows the USB charging when an AC power source is not connected.   The information processing apparatus according to claim 1, wherein the control unit permits the USB charging when an AC power source is connected.   The information processing apparatus according to claim 1, wherein the control unit executes a hibernation process of writing memory information to a storage device when a predetermined time has elapsed after disabling the USB charging.   The control unit, when disabling the USB charging, executes a hibernation process for writing memory information to a storage device when the remaining capacity of the battery becomes a second predetermined value or less. The information processing apparatus described in 1. Comprising an access lamp that lights during writing of information to the storage device;
The information processing apparatus according to claim 5, wherein the access lamp is turned off while the information in the memory is written to the storage device by the hibernation process. It has a power button to turn on the power,
The information processing apparatus according to claim 5, wherein the hibernation process is interrupted by an operation of the power button. Determining a state in which a processor that controls the system of the information processing apparatus is powered off;
Disabling USB charging for charging other devices when the remaining power of the battery is below a predetermined value in a state where the power of the processor is turned off;
A method for controlling the information processing apparatus. Means for determining a power-off state of a processor that controls the system of the information processing apparatus;
Means for disallowing USB charging for charging other devices when the remaining capacity of the battery is below a predetermined value in a state where the power of the processor is turned off;
As a program to make the computer function as.

Images