JP6500469B2 - Electronic system, program of electronic system with sleep mode - Google Patents

Description

  The present invention relates to an electronic system and a program of an electronic system provided with a sleep mode.

As disclosed in Patent Document 1 and the like, an electronic system that includes a main CPU and a sub CPU and uses the main CPU as a sleep mode for power saving during a non-use period is used.
For example, in an electronic system called a multifunction peripheral having a printer, scanner, and fax function, when the main CPU detects that the non-use period continues for a certain period of time, it executes a predetermined process and then enters a sleep mode. Monitor the user's operation etc. as operation of only CPU. Then, when the sub CPU detects that a return condition such as user operation or fax reception is satisfied, the main CPU is restored.

JP, 2014-113731, A

  It takes a predetermined time to shift to the sleep mode. Therefore, the condition for transitioning to the sleep mode is established, and even if processing for the transition is started, it takes a certain amount of time to complete the process. And there may be a situation where it is necessary to return during this time. However, just because a situation has occurred to return, it is not always possible to interrupt the transition to the sleep mode. Then, if it is in the situation to be restored, but it enters the sleep mode and the situation to be restored before the sleep mode starts, it is because it is before the processing of the sub CPU starts. It was not always possible.

  The present invention makes it possible to avoid leaving a problem even when a situation to be restored has occurred during the transition to the sleep mode.

The present invention comprises a main CPU, a sub CPU, and a shared memory, and when a predetermined transition condition for transition to the sleep mode is satisfied, the main CPU executes the predetermined transition processing and then transitions to the sleep mode. An electronic system in which the sub CPU recovers the main CPU when a predetermined recovery condition for recovering from the sleep mode is satisfied in the sleep mode;
The main CPU includes means for writing information related to the establishment of the return condition in the shared memory until the execution of the predetermined transition process is completed after the transition condition is satisfied.
The sub CPU refers to information related to the return condition written in the shared memory, and includes means for returning the main CPU if the return condition is satisfied.

  In the above configuration, when the transition condition is satisfied, the main CPU executes the predetermined transition process for transition to the sleep mode. However, by the time the execution of this process is completed, information related to the return condition may change, and information related to the establishment of the return condition is written to the shared memory. On the other hand, the sub CPU refers to the information related to the return condition written in the shared memory. Then, if the recovery condition is satisfied, the main CPU is recovered based on the same information.

The main CPU starts processing to be completed before transitioning to the sleep mode by the transition condition being satisfied. At this time, even if the return condition is satisfied, the same processing is executed to shift to the sleep mode. However, information related to this return condition is written to the shared memory.
The sub CPU, as an essential function, restores the main CPU when a predetermined return condition for returning from the sleep mode is satisfied in the sleep mode. In the case of this sub CPU, it has a function of referring to the shared memory, and the main CPU refers to the information written to the shared memory. If the recovery condition is satisfied after the start of transition to the sleep mode, the sub CPU recovers the main CPU based on the information since the information related to the recovery condition is written in the shared memory.

  It may be necessary to refer to the information immediately after the transition to the sleep mode in order to determine the establishment of the return condition. As one example, the sub CPU acquires information related to the establishment of the return condition immediately after transition to the sleep mode, and the main CPU refers to the information related to the return condition written to the shared memory. Can be configured to return.

  In such a configuration, the main CPU writes the information at that time to the shared memory before transition to the sleep mode. After that, when the state changes, immediately after the transition to the sleep mode, if the information at that time is acquired, it can be judged whether the information has changed during the transition to the sleep mode, and the return condition is satisfied. Can be determined with certainty.

As an example of the information related to the return condition, it is possible to do the following. That is, various sensors may be provided, and the information related to the return condition may be an output content of the sensor provided in the electronic system.
In the above configuration, the electronic system is provided with various sensors. As an example, a sensor for detecting the open / close state of the door is provided, and if it is assumed that the open / close of the door is one of the recovery conditions, the output contents of the sensor become information related to the recovery condition.
The period of non-use continues, the transition condition to the sleep mode is satisfied, and when the door is opened and closed after preparation for the transition to the sleep mode, the output of the sensor changes. The main CPU writes the output contents of such a sensor to the shared memory, and shifts to the sleep mode. The sub CPU refers to the shared memory to recognize that the output contents of the sensor have changed, and restores the main CPU.

As an example of the output content of the sensor, the output content of the sensor may alternatively represent two or more states, and the return condition may be satisfied when the state changes.
In the above configuration, the sensor alternatively represents two or more states. For example, even if the sub CPU can detect the output contents of the sensor after entering the sleep mode, the transition condition to the sleep mode is satisfied. After that, I do not know if the output contents have changed. Since two or more states are alternatively represented, it can not be determined that the return condition is satisfied, regardless of which state is shown.

  However, before the main CPU shifts to the sleep mode, the output contents of the sensor are also written to the shared memory as information related to the recovery condition, and the sub CPU, together with the information written to the shared memory, recovers the condition immediately after migration. The information related to the establishment of is acquired, and both are compared with reference to the information related to the return condition written in the shared memory. Thereby, it can be detected that the output content of the sensor has changed, and it can be judged that it is necessary to immediately return.

As another aspect of the present invention, the information related to the return condition may be configured by determining the content of the information and determining whether it is necessary to return.
Then, the information related to the return condition is a content in which the transition condition is satisfied before the determination of the content of the information is completed, and thereafter, the determination of the content of the information is completed and it is determined that the recovery is necessary. It is good.
For example, there are some which can determine that the return condition is satisfied only by notifying information. On the other hand, information may be notified and it may not be possible to determine whether or not the return condition is satisfied unless the content of the information is determined.

In such a case, if the return condition is satisfied at the end of the process of this determination, the transition condition to the sleep mode should not be satisfied from the beginning. This is because there is no transition to the sleep mode when there is a need to return.
However, since there are multiple factors in the transition to the sleep mode, the transition to the sleep mode may start based on other factors immediately after the process of the above judgment is started. As described above, when the transition condition is satisfied before the determination of the content of the information is completed, the transition to the sleep mode is continued, the determination of the content of the information is completed, and it is determined that the return is necessary. For example, the content is written to the shared memory as information related to the recovery condition.

With regard to an example of such information, as another aspect of the present invention, network connection may be possible, and when a packet is received from the network, the content of the packet may correspond to the content of the information. .
In the above configuration, since network connection is possible, packets are received from the network. Depending on the contents of the packet, the recovery condition may or may not be met. Then, if it is determined that the return condition is the content that holds, the content of the same packet is written to the shared memory as that corresponding to the content of the information.

It is natural that the program exists as a program for realizing an electronic system as an embodiment of the idea of the invention, and it can not but be said that it is used.
Furthermore, even when a part is software and a part is realized by hardware, the concept of the invention is not completely different, and a part is stored on a recording medium and appropriately used as needed. It may be in a form to be read.

  When the present invention is implemented by software, it may be configured to use hardware or an operating system, or may be implemented separately from these. For example, if various operation processes can be realized by calling a predetermined function in the operating system for processing, it is also possible to input from hardware without calling such a function. is there. And, even if it is actually realized with the intervention of the operating system, it can be understood that the present invention can be practiced only with this program.

  According to the present invention, when a situation to return has occurred during the transition to the sleep mode, the sub CPU refers to the information stored in the shared memory after the transition to the sleep mode. , Can immediately restore the main CPU.

FIG. 1 is a schematic block diagram of a multifunction machine. It is a flowchart of main CPU. It is a flowchart of sub CPU. It is a flowchart of a concrete process of preservation of a signal level. It is a flowchart of a concrete process of preservation of a signal level. It is a flowchart of a concrete process when return conditions are satisfied based on information contents.

Hereinafter, embodiments of the present invention will be described based on the drawings.
FIG. 1 is a schematic block diagram showing a multifunction machine which is an electronic system according to an embodiment of the present invention.
The multifunction device 10 includes a main unit 20 and a sub-unit 30, and realizes a scanner function, a fax function, a copy function, and a printer function.
The main unit 20 has a multi-CPU configuration, and mainly includes a first main CPU 21a, a second main CPU 21b, a sub CPU 23, and a shared memory 24. The first main CPU 21a, the second main CPU 21b, and the sub CPU 23 each include a CPU, a ROM, and a RAM, and constitute a computer provided with an individual operating system. That is, a multi-CPU, multi-OS environment is realized. Also, the shared memory 24 is accessible from these individual computers.
A program for realizing a predetermined function in a computer is stored in a ROM, which is a non-volatile storage area, and is read and executed as appropriate. It can be said that a program for realizing each function of the electronic system of the present invention is stored in this ROM.

Mainly the first main CPU 21a is in charge of the scanner function, fax function, copy function, data processing of the printer function, etc. The second main CPU 21b is in charge of network processing, the sub CPU 23 is a scanner function, fax function, I am in charge of controlling the mechanical mechanism of the copying function and the printer function.
Connected to the main unit 20 are a line sensor 25, a drive unit 26 including various motors, a print head 27, a sensor unit 28 including various sensors, and a network adapter 29 for network connection. It is controlled by the first main CPU 21a, the second main CPU 21b, and the sub CPU 23. The drive unit 26 is provided with a motor for feeding the paper and moving the head. The sensor unit 28 is an ADF paper detection sensor 28a for training the presence or absence of a document in the automatic paper feed unit, and a cartridge door open / close switch (hereinafter simply referred to as door open / close switch) 28b for detecting the opening / closing status of the cartridge door for mounting the ink cartridge In addition, a number of sensors for detecting the condition of the multifunction machine 10 are provided.

  For example, the scanner function mainly uses the line sensor 25 or the drive unit 26, the printer function uses the print head 27 or the drive unit 26, and the copy function uses the line sensor 25 or the drive unit 26 or print head 27 is used. Of course, in realizing these functions, the sensor unit 28 and the network adapter 29 are often operated in parallel.

The sub unit 30 includes a USB adapter 31 and can communicate with an external device through a USB cable.
Here, during normal operation, the first main CPU 21a is in charge of realizing the scanner function and the printing function, the second main CPU 21b is in charge of communication via the network, and the sub CPU 23 assists the first main CPU 21 a to drive Responsible for control of unit 26.

  On the other hand, when not using these main functions, it enters a sleep mode to save power. That is, the power supply to the first main CPU 21a and the second main CPU 21b is stopped, and the sub CPU 23 performs the minimum control. That is, it is monitored whether a condition to restore the first main CPU 21a and the second main CPU 21b occurs. Control during this period is called sleep mode. The sleep mode is also referred to as a power saving mode. Hereinafter, the first main CPU 21a and the second main CPU 21b may be collectively referred to as the main CPU 21. As described above, when the predetermined transition condition for transitioning to the sleep mode is satisfied, the main CPU executes the predetermined transition processing and then transitions to the sleep mode, and returns from the sleep mode in the sleep mode. The sub CPU recovers the main CPU when a predetermined recovery condition for the purpose is satisfied.

The basic flow of transition to sleep mode is
1) Power saving transition condition satisfied (transition condition to sleep mode satisfied),
2) Device stop processing (device driver stop processing),
3) Synchronous processing between the main CPUs 21a and 21b after completion of the device stop processing,
4) disable interrupts,
5) stop the communication between the main CPUs 21a and 21b,
6) The main CPUs 21a and 21b are stopped.

On the other hand, the basic flow when returning is
7) Power saving end condition satisfied (rest condition from sleep mode satisfied),
8) Resume of the main CPUs 21a and 21b,
9) Device restart processing (device driver initialization and activation),
10) Synchronous processing between main CPUs after completion of device restart processing,
11) Resume communication between the main CPUs 21a and 21b,
12) Enable the interrupt.

In addition, conventionally, at the time of transition,
21a) Power saving transition condition established (transition to sleep mode established),
21b) Device stop processing (device driver stop processing),
23) stop the communication between the main CPUs 21a and 21b,
24) Disable interrupts,
25) Synchronous processing between the main CPUs 21a and 21b after completion of device stop processing,
26) The main CPUs 21a and 21b were stopped.

Furthermore, when returning,
27) Restarting the main CPUs 21a and 21b,
28) Enable interrupts,
29) Device restart processing (device driver initialization and activation),
30) Communication between the main CPUs 21a and 21b was resumed.

  Conventionally, during 28) to 29) at the time of recovery, firmware other than the sleep mode needs to operate, and the firmware may try to communicate between the main CPUs 21a and 21b. Since the firmware of each main CPU is a multi-OS environment, it is not aware of the states of the other main CPUs 21a and 21b, and even if the return processing of the other main CPUs 21a and 21b is not completed, the main CPU 21a , 21b trying to communicate.

  On the other hand, in the migration processing of this embodiment, after the device stop processing of 2) is completed, the synchronization processing between the main CPUs 21a and 21b is performed, and thereafter, the main CPUs 21a and 21b perform the other main CPUs 21a, I try not to communicate with 21b. That is, at the time of transition, it is understood that the other main CPUs 21a and 21b are in the transition processing. Furthermore, by stopping the interrupt of 3) before stopping the communication between the main CPUs 21a and 21b of 4), firmware other than the sleep mode is prevented from operating after the process of 4). This is because if interrupts are permitted, firmware other than the sleep mode may operate and become incoherent.

Then, at the time of recovery, after the device restart processing of 9) is completed, the synchronization processing between the main CPUs 21a and 21b is performed and the communication between the main CPUs 21a and 21b is not performed before that. I made it. Therefore, even if the other main CPUs 21a and 21b have not completed the return processing, there is no problem that the communication with the other main CPUs 21a and 21b is started without permission. Furthermore, by ending the process of permitting the 12) interrupt, it is prevented that the firmware other than the sleep mode is not activated before the communication between the main CPUs 21a and 21b of 11) is resumed. This is because there is a possibility that firmware other than the sleep mode may operate and become inconsistent.
By doing as above, it became possible to prevent the inconsistencies caused by the multi-CPU and multi-OS environment.

  On the other hand, it takes a predetermined time to shift to the sleep mode. As described above, even if the transition condition to the sleep mode is satisfied in 1), it takes time to stop the main CPUs 21a and 21b in 6). If a return condition is established during this time, a problem may occur.

For example, the sensor unit 28 includes a door open / close switch 28b. The open state is not a normal state as in the door open / close switch 28b. It can be said that the conditions under which the sleep mode is stopped and conditions for return are satisfied. If the user opens the door of the cartridge after the transition condition to the sleep mode is satisfied in 1), the process returns to 6) even if the sub CPU 23 starts the process in the sleep mode. The return condition is satisfied in the process 7) in the process, and immediately after the transition to the sleep mode, the return process can be started.
Therefore, if it is possible to judge only the output content of the sensor and judge that it should return, even when the state changes after the transition condition is satisfied, there is often no inconsistency.

  On the other hand, in the case of the ADF sheet detection sensor 28a, it is detected whether there is a sheet serving as an original in the ADF. Even if the user leaves the document as it is set, the sleep mode should be entered if the nonuse period is extended, and the sleep mode is entered even if the nonuse period is extended without the user setting the document. It should. That is, the output content of the sensor alternatively represents two or more states, and in any case, the problem can not be detected merely by entering the sleep mode. If the output content of the sensor indicates two or more states alternatively and the return condition is satisfied when the state changes, the change of the state must be monitored. . Even if the state changes during the transition to the sleep mode, since the state does not change after the sub CPU 23 starts to start monitoring, the return condition is not satisfied.

  For example, because the MFP 10 was not used for a certain period of time, the multifunction device 10 started the process of transitioning to the sleep mode, and it is assumed that the user sets the document in the ADF before the transition process is completed. It will be in the state. Therefore, the user can not use the multifunction device because the sleep mode remains.

Hereinafter, processing for preventing such an inconsistency will be described.
FIG. 2 is a flowchart of the main CPU, and FIG. 3 is a flowchart of the sub CPU.
In the main CPU 21 (generally referring to the main CPUs 21a and 21b), it is assumed that the transition condition of the sleep mode is satisfied and the device stop processing of 2) is started.
Step S102 corresponds to the device stop process of 2).
In step S104, the signal level is acquired and stored in the shared memory. Specifically, among the output contents of the various sensors of the sensor unit 28, the output contents of those related to the return condition are stored. Since the output of the sensor is output at a high level or a low level, saving the output content saves the signal level.

Here, FIG. 4 and FIG. 5 are flowcharts of specific processing of signal level storage.
In the case of the ADF sheet detection sensor 28a, the signal level of the ADF sheet detection sensor 28a is acquired in step S302, and the signal level of the ADF sheet detection sensor 28a is stored in the shared memory 24 in step S304.
The network adapter 29 for network connection outputs a signal indicating whether a network cable (LAN cable) is attached to the terminal. A user who has been using a USB cable may attach a network cable to the network adapter 29 in order to start using it via the network. Since the use of the network cable depends on the user's selection, the sleep mode is used regardless of whether the network cable is attached or not attached, as with the presence of an ADF document. You may move to When the network cable changes from the unmounted state to the mounted state, or from the state where the network cable is mounted to the unmounted state, the user is doing some work, so sleep It can be said that it is necessary to return from the mode.
Therefore, in step S312, the signal level of the network cable connection / non-connection is acquired from the network adapter 29, and in step S314, the signal level of the network cable connection / non-connection is stored in the shared memory 24.

  Such processing is performed in step S104 of FIG. Subsequently, in step S106, it is determined whether the return condition is satisfied (based on the signal level or the information content). What can be judged here is that the current signal level itself can be judged that the recovery condition is satisfied, and a packet can be received through the network, and the information content of the packet can be judged and the recovery condition is satisfied. There is something.

If the output contents of the door open / close switch 28b indicate that the state is a closed state, the recovery condition is not satisfied, but if it is an open state, the recovery condition is satisfied. Therefore, the output content of the door open / close switch 28b is acquired, and if it represents an open state, it is determined that the return condition is satisfied, and in step S108, the return flag is set on and stored in the shared memory 24.
On the other hand, there is the information content of the packet as judging the information content and judging that the return condition is satisfied. Since the content of the information is not known only by receiving the packet, it can not be judged that the return condition is satisfied. Therefore, after receiving the packet, the sleep mode transition condition may be satisfied due to another factor. In this case, it is assumed that it has been determined that the content of the packet should immediately return to the MFP 10 while transitioning to the sleep mode. However, since the process of transitioning to the sleep mode proceeds, the multi-function device 10 enters the sleep mode, and since it is the content of the packet already received, even when monitoring in the sleep mode by the sub CPU 23 starts The contents of the packet are not reflected, and it is not processed as if the return condition is satisfied.

However, if it is determined by the process of step S106 that the return condition is satisfied based on the information content before shifting to the sleep mode, the return flag is set on in step S108, and the shared memory 24 is selected. Save to
FIG. 6 is a flowchart of specific processing when return conditions are satisfied based on the information content.
In step S352, the content of the received packet is determined. As an example in which the information content establishes the return condition, in step S354, it is determined whether the information content is a print start packet. If it means that the print start packet has been received, it can be said that it is necessary to return immediately even after entering the sleep mode. For this reason, in step S356, the return flag is set on as the return condition satisfied, and is stored in the shared memory 24.

When the return flag is set to ON and saved in the shared memory 24, it may be saved in the shared memory 24 together with information related to the return flag as well as the return flag. For example, the contents of the print start packet may be written together.
After that, in step S110, the processing for transition to another sleep mode is performed, and then in step S112, the main CPU 21 is stopped.

When the main CPU 21 shifts to the sleep mode, the sub CPU 23 in charge of controlling the mechanical mechanism monitors whether the condition for returning from the sleep mode is not established. Starting the processing to monitor is the processing content in the sleep mode of the sub CPU 23.
The sub CPU 23 starts the sleep mode in S202. In this embodiment, the sub CPU 23 activates dedicated firmware when starting the sleep mode. In addition, dedicated firmware is activated also for normal operation. Step S202 corresponds to activation of dedicated firmware in the sleep mode.

  When the sleep mode is started, first, at step S204, a return flag is read from the shared memory 24. Then, in step S206, it is determined whether the return flag is on. As described above, when the return flag is set to ON and written, since the return condition is satisfied after the transition to the sleep mode, the transition to the sleep mode can not be stopped, but returns immediately. It means that it should be a state. Therefore, in step S214, it is determined that the return condition is established, and the return processing is started. In the present embodiment, the start of the return process is not described in detail, but even if the return condition is satisfied after the transition to the sleep mode, the return condition is satisfied during the sleep mode as usual. Even in this case, the return processing itself does not change.

  As a result, when the return condition is satisfied after the transition to the sleep mode, the firmware for the normal processing is activated substantially without performing the original processing of the sleep mode. This process corresponds to the case where it is judged that the recovery condition is satisfied at the signal level itself, and the packet is received through the network, and the information content of the packet is judged and it is judged that the recovery condition is satisfied. For example, if it was done.

  As described above, when the recovery is started based on the recovery flag, the recovery is performed until the main CPU 21 is stopped after the migration condition is satisfied in the main CPU 21 (until the execution of the predetermined migration processing is completed). When it is determined that the information content of the packet is the content that establishes the return condition as the information related to the condition, or when the state of the door open / close switch 28b changes, the return flag is set as the information related to the return condition. It corresponds to turning on and writing to the shared memory 24. Also on the sub CPU 23 side, the main CPU 21 is restored based on (the information of) the return flag with reference to the return flag as information related to the return condition written in the shared memory 24. become.

On the other hand, when it can not be determined that the return condition is satisfied only with the output contents of the sensor at a certain point, in step S208, the signal level check at the present time is performed. That is, the output content of the sensor at that time is acquired.
Immediately after device stop processing is performed in step S102, the signal level at that time is stored in step S104. Therefore, if the signal level changes during the transition to the sleep mode, the signal level stored in step S104 should be different. In order to determine this, the signal level at the present time after activating the sleep mode is acquired in step S208.

Then, in step S210, the stored signal level is read from the shared memory 24. Subsequently, in step S212, it is determined whether there is a change in the signal level. If the signal level changes during the transition to the sleep mode, the signal level is different from the signal level stored in step S104, so it is determined in step S212 that there is a change in the signal level, and in step S214. It is judged that the return condition is established and the return processing is started.
As described above, the sub CPU 23 acquires information related to the establishment of the return condition immediately after the transition to the sleep mode, and refers to the information related to the return condition written in the shared memory 24 to establish the return condition. Then, the main CPU 21 is restored.

  In step S304 in FIG. 4, the signal level of the ADF paper detection sensor 28a is stored in the shared memory 24. In step S314 in FIG. 5, the signal of the network cable connection presence or absence obtained by the network adapter 29 in the shared memory 24. I have saved my level. If these signal levels are different from the signal levels immediately after the start of the sleep mode, the user sets the document in the ADF or the user mounts the network cable on the network adapter 29 after the start of the transition to the sleep mode. It corresponds to the case of

When such a return process based on the signal level is started, the main CPU 21 performs information on the return condition after the transition condition is satisfied and until execution of a predetermined transition process for stopping the main CPU 21 is completed. As described above, when the main CPU 21 determines that the return condition is satisfied by comparing the content of the signal level stored before transition to the sleep mode with the content of the signal level acquired immediately after activation, the transition condition is After the establishment, the signal level is written in the shared memory 24 as information related to the establishment of the return condition until the main CPU 21 is stopped (until the execution of the predetermined transition process is completed), and the sub CPU 23 enters the sleep mode. The signal level is obtained as information related to the establishment of the return condition immediately after the This corresponds to the return of the main CPU 21 in comparison with information related to the return condition that is being read.
If the return processing is not started as described above immediately after the start of the sleep mode, the normal sleep mode operation is continued in step S216.
In the embodiment described above, the multifunction machine 10 has been described as the electronic system, but the present invention is widely applicable to an electronic system having the main CPU 21 and the sub CPU 23 and having the sleep mode for stopping the main CPU 21 and the sub CPU 23 . Further, the system can be used even in a system in which a plurality of main CPUs 21 are provided or the OSs are individually different. Even if it is not a multifunction device, it can be applied to single models such as scanners, printers, and fax machines.

Needless to say, the present invention is not limited to the above embodiment. It goes without saying for those skilled in the art,
・ Replacing mutually replaceable members, structures, etc. disclosed in the above-mentioned embodiment appropriately and changing the combination thereof ・ Although not disclosed in the above-mentioned embodiment, it is a known technique and the above-mentioned embodiment Appropriately replacing the members and configurations etc. which can be replaced with the members and configurations etc. disclosed in the above, and changing the combination thereof and applying it-although not disclosed in the above-mentioned embodiment, known techniques etc. Those skilled in the art can appropriately substitute the members and configurations etc. which can be assumed as substitutes for the members and configurations etc. disclosed in the above-mentioned embodiments on the basis of the above, and change and apply the combination thereof. As disclosed.

DESCRIPTION OF SYMBOLS 10 ... Multifunction machine, 20 ... Main unit, 21a ... 1st main CPU, 21b ... 2nd main CPU, 23 ... Sub CPU, 24 ... Shared memory, 25 ... Line sensor, 26 ... Drive unit, 27 ... Print head, 28 ... sensor unit, 28a ... ADF paper detection sensor, 28b ... door open / close switch, 29 ... network adapter, 30 ... subunit, 31 ... USB adapter.

Claims (8)

It has a main CPU, sub CPUs and shared memory,
When a predetermined transition condition for transition to the sleep mode is satisfied, the main CPU executes the predetermined transition processing and then transitions to the sleep mode,
The electronic system is configured such that the sub CPU recovers the main CPU when a predetermined recovery condition for recovering from the sleep mode is satisfied in the sleep mode.
The main CPU is a means for writing information related to the establishment of the return condition in the shared memory if the return condition is satisfied after the transition condition is satisfied until the execution of the predetermined transition process is completed. Equipped with
The electronic system is characterized in that the sub CPU refers to information related to the recovery condition written in the shared memory, and includes means for recovering the main CPU if the recovery condition is satisfied. .   The sub-CPU acquires information related to establishment of a return condition immediately after transition to the sleep mode, and restores the main CPU with reference to information related to the return condition written in the shared memory. The electronic system according to claim 1, characterized in that   The electronic system according to claim 1, further comprising various sensors, wherein the information related to the return condition is an output content of the sensor provided in the electronic system.   The electronic system according to claim 3, wherein the output contents of the sensor represent two or more states alternatively, and the return condition is satisfied when the state changes. The electronic system according to claim 1, wherein the information related to the return condition is information that is determined to determine whether or not return is necessary. The information related to the recovery condition is characterized in that the transition condition is satisfied before the determination of the information content is completed, and thereafter the determination of the information content is completed and the recovery is determined to be necessary. The electronic system according to claim 5. 7. The electronic system according to claim 5, wherein the network connection is possible, and the content of the packet corresponds to the information content when the packet is received from the network. A program of an electronic system comprising a main CPU, a sub CPU and a shared memory,
When a predetermined transition condition for transition to the sleep mode is satisfied, the main CPU executes the predetermined transition processing and then transitions to the sleep mode,
It is a program of an electronic system in which the sub CPU recovers the main CPU when a predetermined recovery condition for recovering from the sleep mode is satisfied in the sleep mode.
The main CPU realizes a function of writing information related to the establishment of the return condition in the shared memory until the execution of the predetermined transition process is completed after the transition condition is satisfied.
The sub-CPU refers to the information related to the recovery condition written in the shared memory, and realizes the function of recovering the main CPU if the recovery condition is satisfied. System program.

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