JP2000322160A - Data processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain suitable resuming matched with the using state of a data processor and to improve user's convenience. SOLUTION: When a menu '1' is selected, a check sum is calculated (S350) and compared with a check sum obtained when power supply is off (S360), and only when coincidence between both the check sums is obtained, resuming is executed (S370: YES, S380). When a menu '2' is selected, resuming is executed without checking the normality of backup data (S300: YES, S380). When a menu '3' is selected, time elapsed from the off of the power supply is calculated (S330), and when prescribed time has elapsed (S340: YES), the normality of the backup data is checked and resuming is executed. When the prescribed time has not elapsed yet (S340: NO), resuming is executed without checking the normality of the backup data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing system having a so-called resume function for backing up data in a memory device when power is turned off, and returning to an operation state when the power is turned off based on the data when power is turned on. Related to the device.

[0002]

2. Description of the Related Art In a conventional data processing apparatus, when a power switch is turned off by a user, the data being developed in a main storage device at that time is backed up, so that a program being executed when the power is shut down is supplied to a power supply. Some of them are executed continuously when re-input. In such a data processing device, it is not necessary to terminate the running program one by one when turning off the power switch to interrupt the work, and the program is restarted after the power switch is turned on to restart the work. This is advantageous in that it is not necessary to return to the state at the time of processing interruption.

As a technique for realizing the above-mentioned functions, there is a technique called a suspend / resume method.
In this method, the power supply from the battery is continued to the main storage device even when the power switch is turned off, thereby backing up the contents of the main storage device and the register when the power is turned off, and restarting the interrupted work. Be able to do it instantly upon submission.

[0004] As another technique, there is a technique called a hibernation method. In this method, when the power switch is turned off, the contents of the main storage device and the registers are backed up to a non-volatile storage device such as a magnetic disk device, and when the power switch is turned on, the data backed up from the non-volatile storage device is backed up. Is transferred to the main storage device and the register so that the interrupted work can be performed immediately when the power is turned on again.

[0005] In the present specification, the above-described function is described as a "resume function" regardless of the method of realizing the function. Returning to the state at the time of power-off when the power is turned on again is called “resume activation”. By the way, in a data processing device having such a resume function, part or all of the backed up data is lost due to various factors such as a voltage drop of a battery that supplies power to a main storage device. Sometimes.
When the resume operation is performed in a state where the data has been lost, there is a high possibility that a so-called program runaway will occur. For example, abnormal operation and display may be performed, and sometimes data may be destroyed.

For this reason, there has conventionally been a data processing apparatus that determines the quality of data backed up by a checksum. In this type of data processing device, it is common to calculate a checksum of data expanded in a memory device in block units. This block is, for example, a cluster that is a management unit of the memory area. Then, for each block, data is integrated in units of 1 byte or 2 bytes, for example, and the lower 1 byte or 2 bytes of the integrated value is used as a checksum.

When the power switch is turned off, such a checksum is calculated and this checksum data is also backed up. When the power switch is turned on, the checksum is calculated again and calculated when the power is turned off. The quality of the backed-up data is determined by comparing the obtained checksum. If the checksums do not match, it is determined that at least a part of the data is abnormal, and the above-described resume activation is not performed.

[0008]

However, when such a checksum is calculated, the resuming start time, which is the time from when the power switch is turned on until the work can be started, is lengthened by the calculation time. turn into. The calculation of the checksum as described above is performed for all data in the backup target area of the main storage device. Therefore, usually, the larger the backup target area, the longer the time required for the calculation. Even if the calculation time is a short time, the feature of the resume function that the operation can be started immediately by turning on the power switch is impaired.

That is, (1) In the configuration for obtaining the merit of "preventing program runaway", (2)
The advantage that "work can be resumed immediately by turning on the power switch" is impaired by the checksum calculation time. On the other hand, there is a case where the configuration for realizing the above (1) is not always useful.

For example, in a data processing device in which a backup battery is charged when the power is turned on, the loss of data due to the voltage drop of the battery occurs only when the power switch is continuously turned off for a long time. Occurs in situations. Therefore, in a data processing device in which the power switch is not turned off for a long time, the configuration realizing the above (1) is not particularly useful.

Also, for example, even when the data handled by the data processing device is not so important for the user, it is considered that the configuration for realizing the above (1) is not necessary. In these cases, the user may wish to enjoy the advantage of the above (2) rather than the advantage of the above (1). That is, it is considered that there are users who want to reduce the resuming start time while knowing that there is a possibility of data destruction due to program runaway.

Accordingly, an object of the present invention is to make it possible to appropriately start a resume operation in accordance with the state of use of a data processing apparatus, and to improve the convenience of a user.

[0013]

Means for Solving the Problems and Effects of the Invention The data processing apparatus according to the first aspect of the present invention has been provided with a so-called resume function. That is, the data in the memory device can be backed up when the power is turned off, and can be returned to the operation state when the power is turned off based on the data when the power is turned on. The data in the memory device only needs to include at least data necessary for resuming activation. The “backup” includes, for example, data retention by maintaining power supply to the memory device and data retention by evacuation to a non-volatile storage device. The same applies to the following.

Further, when the power is turned off, not only the above-mentioned data but also check data calculated based on the data is backed up. The check data is, for example, the checksum data described in the description of the related art, but may be any check data corresponding to the data to be backed up.

When the power is turned on, data normality judgment processing can be executed. In the data normality determination process, the normality of the data is determined by calculating the check data based on the data again when the power is turned on and comparing it with the check data backed up when the power is turned off. If the backed-up data is normal, that is, if no data loss occurs, the check data calculated when the power is turned off and the check data calculated when the power is turned on match. Therefore, if the check data does not match, it can be determined that the data has been lost in the power-off state, and the abnormality of the backup data can be determined.

The data processing apparatus of the present invention is based on the premise that the check data is backed up in this way and that the data normality judgment processing using the backed up check data can be executed. Is characterized in that the following first and second activation modes can be switched based on the instruction.

In the first startup mode, the above-described data normality determination processing is executed, and when the backed-up data is normal, the operation returns to the power-off operation state. On the other hand, in the second startup mode, the above-described data determination processing is not performed, that is, the operating state at the time of power shutdown is returned without determining the normality of the backed up data.

Conventionally, when the backed-up data has been lost, there have been problems such as abnormal operation and display, and data destruction. for that reason,
Conventionally, the normality of backup data has been checked using check data such as checksum data when the resume is started. By this (1)
The advantage of "preventing program runaway beforehand" can be enjoyed, but on the other hand, the advantage of (2) "can resume work immediately by turning on the power switch" has been impaired by the calculation time of check data.

On the other hand, the present invention focuses on the fact that the usefulness of the configuration for realizing the above (1) changes depending on the use status of the data processing apparatus, and considers the necessity of checking the normality of the backup data by the user. Was made to judge.
For example, in a case where the time from power-off to power-on is short, the voltage drop of the backup battery is small, so that the backup data hardly disappears. Therefore, in this case, if the user selects the second activation mode, the data normality determination processing is not executed, and the time required for the resume activation is reduced by the processing time. That is, the advantage of the above (2) can be enjoyed. On the other hand, if the power switch is frequently turned off for a long time, the voltage drop of the backup battery increases,
Backup data is likely to be lost. Therefore,
In this case, if the user selects the first activation mode, the normality of the data is checked as before, and no trouble occurs due to data loss. That is, the advantage of the above (1) can be enjoyed.

Here, an example in which the first or second activation mode is switched at intervals of use of the data processing device has been described. However, when the data handled by the data processing device is highly important, data destruction is avoided as much as possible. In the case where the first activation mode in which the advantage of the above (1) for obtaining the data is obtained is selected, and the data handled by the data processing device is of low importance, the advantage of the above (2) for improving the work efficiency is obtained. It is also conceivable to select the resulting second activation mode.

As described above, in the data processing device of the present invention, it is possible to appropriately start the resume in accordance with the use condition, and this contributes to the improvement of the user's convenience. By the way, as described above, even if an attempt is made to determine the necessity of the normality check of the backup data based on the interval of use of the data processing apparatus, it is conceivable that the interval of use of the data processing apparatus is not constant for some users. For example, there are days when the power is repeatedly turned on and off frequently, and days when the power is not used at all.

Therefore, it is conceivable to adopt a configuration as described in claim 2. In this configuration, when power is turned off,
Not only check data calculated based on data,
Back up the power-off time. Then, on the premise of backup of the power-off time, a third startup mode is provided in place of the second startup mode, and the first startup mode and the third startup mode described above are provided. Is switchable.

In the third startup mode, it is determined whether the normality of the backup data is to be checked based on whether a predetermined time has elapsed since the power was turned off. It is conceivable that the predetermined time is set in advance based on the capacity of the battery. For example, in the case of a battery that can be backed up for three days if it is sufficiently charged, the predetermined time is set to two days (48 hours) in consideration of a margin. In this configuration,
When a predetermined time has elapsed since the power-off time when the power was turned on, the backup data was likely to have been lost due to the voltage drop of the battery. To return to the operating state. On the other hand, when the predetermined time has not elapsed, it is unlikely that the backup data has been lost due to the voltage drop of the battery, so that the operation returns to the operation state without executing the data normality determination process.

According to such a configuration, on the premise that the usefulness of the configuration for realizing the above (1) changes depending on the use interval of the data processing device, if the usefulness increases, the above-mentioned (1) will be used. On the other hand, if the usefulness is reduced, the advantage (2) can be enjoyed. As a result, it is possible to improve the convenience of the user whose usage interval of the data processing device is not constant.

Further, as set forth in claim 3, the above-mentioned first, second and third start modes may be switched. The description of each activation mode is the same as the description of the first or second aspect of the present invention, and a description thereof will not be repeated. In this way, the data processing device can be activated more appropriately in accordance with the usage status,
The convenience of the user is further improved.

On the other hand, if only the loss of the backup data due to the voltage drop of the battery due to the use interval of the data processing device is considered, a data processing device having only the third start mode may be configured. ). In this case, the start mode cannot be selected, but it is advantageous in that the configuration is extremely simple.

The start mode may be switched by a mechanical means such as a dip switch. However, if a dip switch is used, for example, the user needs to know which switch arrangement corresponds to which activation mode. If the user has not grasped it, it is necessary to refer to a manual or the like when switching the startup mode. In view of this, it is preferable that a menu for switching between the start modes is configured to be displayed, and that the user selects each of the start modes from the menu to switch the start modes. With this configuration, it is not necessary to grasp the correspondence between each activation mode and, for example, the switch arrangement, and the switching of the activation modes is simplified.

Further, in a configuration in which it is determined whether or not the normality of backup data is to be checked based on whether or not a predetermined time has elapsed since the power was turned off, the user may be allowed to perform the predetermined time. It is desirable to be able to change the settings. Assuming that the interval between turning off the power switch and turning on the power switch next varies, the shorter the predetermined time is set, the more often the data normality determination process is executed, and Although the startup time becomes longer in total, it is more likely that a program runaway due to an abnormality in the backup data can be prevented. That is, the merit of the above (1) is prioritized over the merit of the above (2). On the other hand, as the predetermined time is set longer,
Data health judgment processing is less frequently performed,
Although the possibility of preventing the program runaway due to the abnormality of the backup data is reduced, the resuming start time can be shortened in total. That is, the merit of the above (2) is prioritized over the merit of the above (1). Therefore, if the setting of the predetermined time can be changed, more appropriate resume activation can be performed, and as a result, user convenience is achieved.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of the data processing device of the present embodiment. This data processing device is configured as a so-called computer system including a CPU 10, a RAM 20, a flash ROM 30, and a battery 40.

The RAM 20 has a user area 21 for storing an application program and data used in the application program, and a checksum area 22 for storing checksum data to be described later.
Is prepared. A battery 40 is connected to the RAM 20. Therefore, data such as an application program developed in the RAM 20 is retained by power supply from the battery 40 even when a power switch (not shown) is turned off. The battery 40 is charged by external power supply while the power switch is on.

The flash ROM 30 stores a system program 31. This system program 3
1 is a program for realizing various functions of the data processing apparatus. Next, the operation of the data processing device will be described.

The present data processing device is a so-called computer system.
Various processing is performed based on the application program developed in the user area 21 of the. At this time, if the power switch is turned off during the execution of the application program, the power-off process is executed, and if the power switch is turned on again, the power-on process is executed. Thus, a so-called resume function is realized in which the application program being executed is continuously executed when the power switch is turned off.
The resume function has a feature. Therefore, this point will be described below.

First, a resume function setting process which is a premise of the power-off process and the power-on process will be described with reference to the flowchart of FIG. The resume function setting process is executed by the CPU 10 based on the system program 31 of the flash ROM 30 described above, and is executed when a user performs a predetermined operation through an input unit (not shown).

First, a menu is displayed in the first step S100. This menu is for selecting an activation mode when the resume function is used.
Here, as shown in FIG. 5, a start mode selection menu is displayed on display means (not shown).

As shown in FIG. 5, three startup modes are prepared. The mode in which the file checksum is tested and activated is menu "1". The mode for starting without performing the file checksum test is the menu “2”. The mode in which the file checksum is tested and activated only when a certain period of time has elapsed is menu "3". Therefore, selection of menu “1” corresponds to selection of “first activation mode”, selection of menu “2” corresponds to selection of “second activation mode”, and selection of menu “3” corresponds to “selection of second activation mode”. This corresponds to the selection of the “third start mode”.

When such a menu is displayed, the user makes a menu selection via the input means. Therefore, in subsequent S110, it is determined whether or not the user has made a menu selection. Here, as long as no menu selection has been made (S110: NO), this determination processing is repeated. On the other hand, when the menu is selected (S110:
YES), and it transfers to S120.

In S120, it is determined whether the selected menu is "1". If the menu is "1" (S120: YES), "1" is substituted for the setting variable S in S130, and the routine goes to S170. On the other hand, if the menu is not “1” (S120: NO),
Move to S140.

In S140, it is determined whether the selected menu is "2". If the menu is "2" (S140: YES), "2" is substituted for the setting variable S in S150, and the routine goes to S170. On the other hand, if the menu is not “2” (S140: NO),
That is, if the selected menu is "3",
At S160, “3” is substituted for the setting variable S, and the routine goes to S170.

At S170, the process proceeds from S130, S150 or S160, the setting variable S is stored in the RAM 20.
Is stored in the user area 21, and thereafter, the resume function setting process ends. After the start mode is selected once by such a resume function setting process, if the power switch is turned off during the execution of the application program as described above, the power-off process is executed.

Next, the power-off process will be described with reference to the flowchart of FIG. This power off process
This is an interrupt process executed by the CPU 10 based on the system program 31 in the flash ROM 30. CPU10
Executes this processing by judging that the power switch is off based on a change in the level of a predetermined terminal of the CPU 10.

First, in the first step S 200, the current time is stored in the user area 21 of the RAM 20. This process stores the power-off time. Following S21
If it is 0, the checksum is calculated. This processing is performed in the RAM 2
This is intended for data developed in the user area 21 of 0. The user area 21 is managed by a cluster. The CPU 10 calculates a checksum for each cluster. Specifically, the data in each cluster is integrated in units of 2 bytes, and the lower 2 bytes of the integrated value are used as a checksum.

At S220, the checksum calculated at S210 is stored. This checksum is stored in RAM
20 are stored in the checksum area 22. Then, in subsequent S230, an end process is performed. This processing is performed by the CPU
10, the RAM 20, the flash ROM 30, and the power supply to each block of the battery 40 are cut off. As a result, the power supply from the outside is stopped, and the power supply is shut off. However, R
Since power is supplied to the AM 20, the contents of the RAM 20 are retained.

Thereafter, when the power switch is turned on, a power-on process is executed. Therefore, next, the power-on processing will be described based on the flowchart of FIG. This power-on process is also executed by the CPU 10 based on the system program 31 in the flash ROM 30. CPU10
Executes this processing by judging that the power switch is on based on a change in the level of a predetermined terminal of the CPU 10.

First, in the first step S300, it is determined whether or not the setting variable S is "2". Setting variable S
Corresponds to S during the resume function setting process described above with reference to FIG.
At 170, it is stored in the user area 21 of the RAM 20. Here, when S = “2” (S300: YE
S), the process proceeds to S380 without executing the subsequent processing. On the other hand, if S ≠ “2” (S300: NO), S31
Move to 0.

In S310, it is determined whether or not the setting variable S is "3". Here, when S = “3” (S3
10: YES), and proceeds to S320. On the other hand, S ≠
If it is "3" (S310: NO), that is, if the setting variable S is "1", the process proceeds to S350.

At S320, to which the process proceeds when the setting variable S is "3", the power-off time is read. This power-off time is determined in S20 during the power-off processing described above with reference to FIG.
0 is the time stored and stored in the user area 21 of the RAM 20. At S330, the current time and S
The elapsed time is calculated from the power-off time read in 320. Therefore, this elapsed time is the time from when the power switch is turned off to when the power switch is turned on.

Then, in the next S340, it is determined whether or not a predetermined time has elapsed from when the power switch was turned off to when the power switch was turned on. If it is determined that the predetermined time has elapsed (S340: YES), the process proceeds to S
Move to 350. On the other hand, when it is determined that the predetermined time has not elapsed (S340: NO), the process proceeds to S380 without executing the subsequent processes.

If a positive determination is made in S340, or
In S350 to which the process proceeds when a negative determination is made in S310, a checksum is calculated. This processing is similar to the processing of S210 in FIG. That is, RAM
A checksum is calculated for each of the 20 user areas 21 in cluster units.

At S360, the checksums are compared. In this process, the checksum calculated and stored in the power-off process (S210, S220 in FIG. 3) and S3
This is to compare with the checksum calculated at 50. Then, in the next S370, it is determined whether or not the checksums match. Here, when it is determined that the checksums match (S370: YES), S38.
Move to 0. On the other hand, when it is determined that the checksums do not match (S370: NO), the process proceeds to S390.

In S380, which is the case when a positive determination is made in each of S300, S340, and S370, an activation process is performed. This process is a so-called resume activation process for continuously executing an application program at the time of power-off based on data stored in the user area 21 of the RAM 20.

On the other hand, in step S390, where the checksums do not match, an abnormal-time process is performed without performing the resume activation process. In the abnormality processing of the present embodiment, the system program 31 stored in the flash ROM 30 is used.
Invoke the system menu based on.

Next, effects exerted by the data processing apparatus of this embodiment will be described. In the data processing device of the present embodiment, the user can select one of three activation modes for performing the resume activation. When the menu "1" is selected, the checksum is calculated by the power-on processing shown in FIG. 4 (S35).
0) Compared with the checksum at power-off (S36)
0), the resume activation is performed only when they match (S
370: YES, S380). That is, the normality of the backup data is checked and the resume is started. Therefore, the following advantage can be obtained: (1) “Program runaway that can occur when backup data is abnormal can be prevented”.

When the menu "2" is selected, FIG.
In the power-on processing shown in (1), the resume activation is performed without checking the normality of the backup data (S300: YES, S380). In other words, the calculation of the checksum, which is a factor for increasing the startup time, is not performed. Therefore, the advantage of (2) "the work can be immediately resumed by turning on the power switch" can be enjoyed.

When the menu "3" is selected, an elapsed time from the power-off time is calculated in the power-on processing shown in FIG. 4 (S330), and if the predetermined time has elapsed (S330).
340: YES), since there is a high possibility that the backup data has been lost due to the voltage drop of the battery 40, the normality of the backup data is checked and the resume is started. On the other hand, if the predetermined time has not elapsed (S
340: NO), since the possibility that the backup data is lost due to the voltage drop of the battery 40 is low, the resume activation is performed without checking the normality of the backup data. Therefore, when the reliability of the backup data decreases, the advantage (1) can be enjoyed, and while the reliability of the backup data is high, the advantage (2) can be enjoyed.

Therefore, for example, if the user frequently turns on / off the power of the data processing apparatus, the battery 4
Since the voltage drop of 0 becomes small, the backup data hardly disappears. Therefore, in this case, if the user selects the menu “2”, the data normality determination processing is not executed, and the time required for resuming activation is reduced by the processing time. That is, the advantage of the above (2) can be enjoyed. On the other hand, if the user frequently turns off the power switch for a long time, the voltage drop of the battery 40 becomes large, so that the backup data is easily lost. Therefore, in this case, if the user selects the menu “1”, the normality of the data is checked as in the conventional case, and no trouble occurs due to the data loss.
That is, the advantage of the above (1) can be enjoyed.

For a user who does not use the data processing apparatus at regular intervals, for example, there are days when the power is repeatedly turned on and off, and days when the power is not used at all, the menu “3” is displayed. By making a selection, if the possibility of backup data loss increases, the advantage of (1) can be enjoyed. On the other hand, if the possibility of backup data loss decreases, the advantage of (2) can be enjoyed. be able to.

Although the menus "1" to "3" are selected at intervals of use of the data processing apparatus, for example, when data handled by the data processing apparatus is high in importance, data destruction is minimized. The menu "1" is selected with priority given to the advantage of the above (1), and when the importance of the data handled by the data processing device is low, the advantage of the above (2) for the efficiency of the work is reduced. It is also conceivable to preferentially select menu "2".

As described above, in the present data processing apparatus, it is possible to appropriately start the resume in accordance with the use situation, and it is possible to improve the convenience for the user. Also,
In the present data processing apparatus, three activation modes for performing the resume activation can be selected from a menu.
Also in this point, the user does not need to grasp the correspondence between the switch arrangement and the start mode when switching the start mode, as compared with the case where the start mode is switched by mechanical means such as a dip switch. This is advantageous.

As described above, the present invention is not limited to such an embodiment, and can be implemented in various forms without departing from the gist of the present invention. In the above-described embodiment, the configuration is such that three startup modes can be selected. However, from the viewpoint of simplifying the configuration, for example, a configuration having two startup modes out of the three startup modes is provided. May be selected. If only the loss of the backup data due to the voltage drop of the battery 40 is considered, a data processing device having only the start mode corresponding to the menu “3” may be configured. In this case, since the resume function setting process described with reference to FIG. 2 and the power-on process described above with reference to FIG.
The configuration becomes extremely simple.

Further, in the above embodiment, S in FIG.
The “predetermined time” in the determination process of 340 may be set and changed by the user. Assuming that the interval between turning off the power switch and turning on the power switch next varies, the shorter the predetermined time is set, the more often the data normality determination process is executed. Although the resume startup time is prolonged in total, it is more likely that program runaway due to an abnormality in the backup data can be prevented. That is, the merit of the above (1) is prioritized over the merit of the above (2). On the other hand, the longer the predetermined time is set, the less the data normality judgment processing is executed, and the lower the possibility of preventing program runaway due to abnormal backup data. it can. That is, the above (2) is more effective than the above (1).
Priority is given to Therefore, if the setting of the predetermined time can be changed, more appropriate resume activation can be performed, and as a result, user convenience is achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a data processing device according to an embodiment.

FIG. 2 is a flowchart showing a resume function setting process executed by the data processing device.

FIG. 3 is a flowchart showing a power-off process executed in the data processing device.

FIG. 4 is a flowchart showing a power-on process executed by the data processing device.

FIG. 5 is an explanatory diagram showing a menu screen displayed in a resume function setting process.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... CPU 20 ... RAM 21 ... User area 22 ... Check sum area 30 ... Flash ROM 31 ... System program 40 ... Battery

Claims (6)

[Claims] 1. A data processing device capable of backing up data in a memory device when power is turned off and returning to an operation state when power is turned off based on the data when power is turned on. The calculated check data is backed up together with the data, and when the power is turned on, the check data based on the data is calculated again and compared with the check data backed up when the power is turned off, thereby checking the normality of the data. A first activation mode for executing the data normality determination process and returning to the operation state when the data is normal, assuming that the data normality determination process to be determined can be executed; Switching to a second startup mode for returning to the operation state without executing the data normality determination processing The data processing apparatus characterized by being configured to capacity. 2. The data processing apparatus according to claim 1, wherein at the time of the power-off, the check data and the power-off time calculated based on the data are backed up together with the data. When a predetermined time has elapsed from the power-off time, the data normality determination process is performed, and when the data is normal, the operation returns to the operation state. On the other hand, when the predetermined time has not elapsed. Has a third startup mode for returning to the operation state without executing the data normality determination processing, instead of the second startup mode, wherein the first startup mode and the third startup mode A data processing device configured to be switchable between modes. 3. The data processing apparatus according to claim 1, wherein at the time of power-off, the check data calculated based on the data and a power-off time are backed up together with the data. When a predetermined time has elapsed from the power-off time, the data normality determination process is performed, and when the data is normal, the operation returns to the operation state. On the other hand, when the predetermined time has not elapsed. Has a third activation mode for returning to the operation state without executing the data normality determination processing, and includes a first activation mode, a second activation mode, and a third activation mode. A data processing device capable of switching between modes. 4. A data processing device capable of backing up data in a memory device when power is turned off and returning to an operation state when power is turned off based on the data when power is turned on. The calculated check data and the power-off time are backed up together with the data, and when the power is turned on, the check data based on the data is calculated again, and the calculated data is compared with the check data backed up when the power is turned off. Assuming that it is possible to execute a data normality judgment process for judging the normality, when a predetermined time has elapsed from the power-off time at the time of power-on, the data normality judgment process is executed. When the data is normal, the operation returns to the operation state, while the predetermined time has elapsed. When no, the data processing apparatus characterized by returning to the operating state without executing the data normality determination process. 5. The data processing device according to claim 1, wherein a menu for switching between the activation modes can be displayed, and the switching between the activation modes is performed from the menu. A data processing apparatus characterized in that the processing is performed by a user selecting each of the activation modes. 6. The data processing apparatus according to claim 2, wherein said predetermined time is changeable.