JP6019678B2 - Mobile terminal device - Google Patents

Description

  The present invention relates to a portable terminal device.

  A portable terminal device such as a portable optical information reading device generally has a configuration in which a volatile memory and a nonvolatile memory are provided in the device. Since volatile memory is generally capable of high-speed processing, it is used in various arithmetic processes. However, if the power supply is interrupted, the stored contents will be volatilized, so a separate nonvolatile memory is provided. Used for backup of contents.

JP 2007-18428 A

  By the way, in the portable terminal device as described above, the power supplied from the power supply means to the volatile memory may be completely stopped or reduced. For example, in this type of portable terminal device, a configuration including a battery and a sub-battery is widely provided. However, when the battery is detached due to a drop impact or the battery is pulled out by an unintended operation, or for some reason, the battery voltage If the battery voltage drops rapidly, the battery can no longer maintain the storage state of the volatile memory. In this case, the stored contents of the volatile memory will be maintained by the power supply from the sub-battery, but if the power supply from the sub-battery is stopped or reduced for some reason, it will be stored in the volatile memory until then. The contents will disappear completely.

  Even if the contents of the volatile memory are volatilized in this way, the problem will be reduced if management information that manages the contents of the volatile memory can be backed up to the nonvolatile memory before volatilization. If the volatile memory is erased without backing up management information to the non-volatile memory, the contents stored in the volatile memory up to that point will not be reflected in the next time. At times, there is a concern that abnormal startup processing is performed based on the contents of the nonvolatile memory in which backup information does not exist or backup information is insufficient, resulting in a system failure.

  The present invention has been made to solve the above-described problems. In a mobile terminal device having a volatile memory, sufficient power supply is not maintained for the volatile memory, and the contents of the volatile memory are volatile. Even if it is a case where it does, it aims at providing the structure which a systematic malfunction does not produce easily at the time of subsequent restart.

The present invention provides a first nonvolatile memory capable of storing data, and management information configured to be able to store data when receiving power supply, and for managing the data stored in the first nonvolatile memory , A first control means for controlling data transfer between the volatile memory and the first non-volatile memory, power for operating at least the volatile memory and other electronic components and power supply means for supplying a first second nonvolatile memory different from the nonvolatile memory, and a second control means for controlling the writing of data to the previous SL second nonvolatile memory, power supply by the power supply unit After stopping, the auxiliary power supply means that can supply power to at least the second control means, and whether or not the power supply from the power supply means to the volatile memory is in a predetermined stop state is determined. Determination means, and the second control means operates upon receiving power supply from the auxiliary power supply means, and at least predetermined abnormality history information when the determination means determines that the stop state has occurred. Is stored in the second nonvolatile memory, and the power source means includes a first power source and a second power source for supplying power to at least the volatile memory, and the volatile memory is connected to the first power source. When the power supply is stopped or becomes a predetermined low level state, the stored content is maintained based on the power supply from the second power supply, and the determination means is configured to receive the power from the second power supply. It is determined whether the power supply to the volatile memory is in the stopped state, and the second control unit determines that the power supply from the second power source is determined to be in the stopped state by the determining unit. And writes the abnormality history information on the second non-volatile memory based on the power supply from a different said auxiliary power supply means comprises a serial second power supply.

According to the first aspect of the present invention, there is provided a first nonvolatile memory capable of storing data, and a volatile memory storing management information for managing data stored in the first nonvolatile memory. Data transfer between the memory and the first nonvolatile memory is controlled by the first control means. By doing so, the backup information can be managed in the volatile memory while enabling the backup of data to the first nonvolatile memory.
In this configuration, if no measures are taken, the backup information cannot be managed, for example, at the next start-up, for example, if the management information is deleted due to the power from the power source being reduced or shut down for some reason. Although there is a problem that an abnormal startup process is performed, in the present invention, in order to cope with such a problem, an auxiliary device that can supply power to at least the second control unit after the power supply by the power source unit is stopped. A second control that is provided with power supply means and operates by receiving power supply from the auxiliary power supply means when it is determined by the determination means that the operation is stopped (a state in which the operating power to the volatile memory cannot be maintained); The means records at least predetermined abnormality history information in the second nonvolatile memory. Therefore, the loss of the management information in the volatile memory can be left as an abnormality history in the second nonvolatile memory, and the next startup can be started on the assumption that such management information is lost. For example, if startup is performed without using the management information in the first nonvolatile memory at the time of startup when the abnormality history remains, the management information in the first nonvolatile memory is temporarily insufficient. However, it does not cause a system failure or the like due to it.
The power supply means has at least a first power supply and a second power supply that supply power to the volatile memory, and the volatile memory stops supplying power from the first power supply or enters a predetermined low level state. The stored contents are maintained based on the power supply from the second power source. In this configuration, even when the power supply from the first power source is at a level where the stored contents of the volatile memory cannot be maintained (for example, when an instantaneous interruption occurs), the power supply from the second power source is based on the power supply from the second power source. The stored contents of the volatile memory can be maintained.
In such a configuration, the determination unit further determines whether power supply from the second power source to the volatile memory has been stopped, and the second control unit determines whether the second power source has received power from the second power source. When it is determined that the power supply is in a stopped state, the abnormality history information is written to the second nonvolatile memory based on the power supply from the auxiliary power supply means different from the second power supply. That is, even when the second power supply becomes insufficient, the abnormality history information can be written in the second nonvolatile memory based on the power supply from the auxiliary power supply means different from the first power supply and the second power supply. In particular, in this configuration, when the second power supply is sufficiently maintained, it is not necessary to perform an operation of writing an abnormality history as being capable of being handled by the second power supply. An abnormal history can be written as a practical means.

  In the invention of claim 3, when the power supply from the power supply means is started, the recorded content of the second nonvolatile memory is referred to, and the notification process is performed when abnormality history information is recorded in the second nonvolatile memory. Informing means for performing is provided. According to this configuration, the user or the like can be informed that the contents of the volatile memory are lost, and the user or the like can be encouraged to take an appropriate action.

  In the invention of claim 4, the second non-volatile memory is a memory having a larger allowable number of writing times than the first non-volatile memory. In this configuration, the frequency of writing to the first nonvolatile memory can be reduced and the life of the first nonvolatile memory can be extended by not writing or reducing the abnormality history to the first nonvolatile memory. Can do.

FIG. 1 is a block diagram schematically illustrating an electrical configuration of a mobile terminal device according to an embodiment of the invention. FIG. 2 is a flowchart illustrating the main process of the mobile terminal device of FIG. FIG. 3 is a flowchart illustrating an abnormality history writing process performed by the second control circuit in the mobile terminal device of FIG. FIG. 4 is a flowchart showing a process at the time of initial setting in the main process of FIG. FIG. 5 shows a state in which the mobile terminal device is powered off in the initial state (FIG. 5A), the power-on state (FIG. 5B), and the data file downloaded (FIG. 5C). The memory images of the FROM 13 and the SDRAM 11 during the transition to the power-off process (FIG. 5D) are shown.

[Embodiment]
Hereinafter, an embodiment embodying a mobile terminal device according to the present invention will be described with reference to FIG.
(Outline of electrical configuration)
The electrical configuration shown in FIG. 1 is applied to a portable terminal device that reads an information code (optical information medium) such as a barcode or a two-dimensional code. The mobile terminal device 1 is configured to be driven by a 3V operation power supply (main power supply) stabilized through a power supply circuit 21 for the power supply of the battery 3a. As the battery 3a, for example, a lithium ion battery having a voltage of 3.0V to 4.2V can be used. The main power supply is supplied to a microcomputer (hereinafter also referred to as a microcomputer) 7, SDRAM 11, FROM (flash ROM) 13, voltage detection circuit 27, real-time clock IC (RTC) 25, etc. , And supplied via a Schottky diode 32).

  The voltage of the main power supply is monitored by the main power supply voltage monitoring circuit 29. When the main power supply voltage monitoring circuit 29 falls to a level equal to or lower than a set threshold value (low battery), the microcomputer 7 outputs a low battery detection signal.

  Further, the power source of the battery 3a is boosted to 5 V via a DC / DC converter (step-up DC / DC) 23, for example, a sub-battery 3b and a linear regulator 31 configured by an electric double layer capacitor having a capacity of about 1.5F. Has been supplied to. The linear regulator 31 generates a voltage of 3.1 V from the 5 V voltage, and supplies a backup power supply (BU3V) to the voltage detection circuit 27 and the RTC 25 via the Schottky diode 34. The backup power (BU3V) is also supplied to the SDRAM 11 via the P-channel MOSFET 43. When the power supply from the battery 3a is stopped or in a low level state, power is supplied to the linear regulator 31 from the sub battery (second power supply) 3b.

  In this embodiment, the battery 3a and the sub-battery 3b correspond to an example of a power supply unit, and function to supply power for operation to the SDRAM 11 (volatile memory) and other electronic components. Further, the battery 3a corresponds to an example of “first power supply”, and the sub-battery 3b corresponds to an example of “second power supply”, both of which can supply power to the SDRAM 11 (volatile memory). When the power supply from the battery 3a (first power supply) is stopped or in a predetermined low level state (for example, a state of 2.7 V or less), the SDRAM 11 (volatile memory) The stored contents are maintained based on the power supply from the second power source.

  The RTC 25 is configured such that the set time data is backed up by a backup power supply (BU3V), and the current consumption at the time of backup is, for example, about 10 μA. On the other hand, the current required for backup while refreshing the data in the SDRAM 11 is about 800 μA, for example. Further, the lower limit of the operable voltage of the SDRAM 11 is, for example, 2.7V, and the lower limit of the operable voltage of the RTC 25 is further lower than 2.7V (for example, about 1.5V).

  The gate of the P-channel MOSFET 43 is connected to the source of the resistor 37 and the Q bar output terminal of the D flip-flop 41. Data and a clock are input by the D flip-flop 41 and the microcomputer 7 and set / reset is performed. The Q output terminal of the D flip-flop 41 is connected to the input port of the microcomputer 7 via the diode 33 in the reverse direction. The anode side of the diode 33 is pulled up to the main power supply via the resistor 39, and the diode 33 is input to the microcomputer 7 when the main power supply is stopped and only the sub battery 3b is active. It is arranged to prevent current from flowing into the port.

  The detection output signal of the voltage detection circuit 27 is given to the clear (CLR) terminal (negative logic) of the D flip-flop 41. The voltage detection circuit 27 monitors the power supply voltage for backup when the supply of the main power supply is stopped. When the input voltage drops from 2.8 V in the normal state to 2.7 V, the voltage detection circuit 27 sets the detection output signal to the low level. To change. The signal output terminal is pulled up to a backup power source. At that time, since the D flip-flop 41 is cleared, the P-channel MOSFET 43 is turned off.

  Further, the casing of the mobile terminal device 1 has a battery lid (none of which is shown) that is opened and closed when the battery 3a is stored and taken out inside the casing, and the microcomputer 7 is in an open / closed state of the battery lid. Can be recognized by turning on / off the battery lid open / close detection switch 45 for detecting the battery. The microcomputer 7 can communicate with an external host 49 via a communication interface (I / F) 47, and a data file downloaded from the host 49 is written in the FROM 13. .

  The output signal of the power switch 51 for the user to switch on / off the power of the mobile terminal device 1 is supplied to the power supply circuit 21 via the 3-input OR gate 53 and also to the input port of the microcomputer 7. It has been. The remaining two input terminals of the OR gate 53 are connected to the output port of the microcomputer 7 and the output terminal of the RTC 25, respectively. When the microcomputer 7 is activated after the power switch 51 is pressed, a high level is output from the microcomputer 7 to the OR gate 53 and the power-on state is maintained. When the main power supply is stopped and the power is turned off, the microcomputer 7 outputs a low level. The RTC 25 controls the power supply circuit 21 in order to realize the timer activation of the mobile terminal device 1 and the like.

  Furthermore, in this embodiment, in addition to the above basic configuration, a second control circuit 9, an EEPROM 15, and an auxiliary power source 5 are provided.

  The second control circuit 9 corresponds to an example of “second control means”, is connected to the microcomputer 7 and the EEPROM 15, and is configured to control data writing to the EEPROM 15. Further, the Q bar output terminal of the D flip-flop 41 is connected to the input terminal of the second control circuit 9, and a signal from the Q bar output terminal is inputted. The second control circuit 9 can receive power from the power supply line L1 via the Schottky diode 36, and can also receive power from the auxiliary power source 5.

  The EEPROM 15 is connected to the second control circuit 9 and the auxiliary power supply 5, and is configured such that data is written by the second control circuit 9. In the present configuration, the EEPROM 15 having a larger allowable number of writing times than the FROM 13 as the first nonvolatile memory is used as the second nonvolatile memory for recording the abnormality history information.

  The auxiliary power source 5 is constituted by a known capacitor, and is charged by the main power source or the sub-battery 3b when the P-channel MOSFET 43 is turned on. In addition, even when the P-channel MOSFET 43 is turned off and charging is stopped, the capacity is such that operating power is ensured until the abnormality history writing process (described later) of S12 by the second control circuit 9 is completed. . The auxiliary power supply 5 corresponds to an example of “auxiliary power supply means”, and after power supply by the power supply means (battery 3a, sub-battery 3b) is stopped, power is supplied to at least the second control circuit 9 (second control means). Functions to do the supply.

Next, the operation of this embodiment will be described.
First, the state of the memory will be described. FIG. 5 shows a state in which the mobile terminal device 1 is powered off in the initial state (FIG. 5A), the power-on state (FIG. 5B), and the data file downloaded (FIG. 5C). ) Shows memory images of the FROM 13 and the SDRAM 11 during the transition to the power-off processing (FIG. 5D).

  In the initial state shown in FIG. 5A, the FROM 13 has a control program area in which a control program is stored and a data area in which other data files are stored. The file management area includes these areas. File management information for managing data files (file management information corresponds to an example of “management information”) is stored. Then, as shown in FIG. 5B, when the mobile terminal device 1 is powered on, the file management area of the FROM 13 is transferred to the SDRAM 11. Further, when the microcomputer 7 starts operation, a part of the SDRAM 11 is used as a work area.

  The SDRAM 11 corresponds to an example of a “volatile memory”, is configured to be able to store data when receiving power supply, and is a file management for managing data stored in the FROM 13 (first non-volatile memory). It functions to store information (management information). The FROM 13 corresponds to an example of a “first nonvolatile memory”. The microcomputer 7 corresponds to an example of “first control means”, and functions to control data transfer between the SDRAM 11 (volatile memory) and the FROM 13 (first nonvolatile memory).

  Further, as shown in FIG. 5C, when a data file is downloaded from the host 49, the data file is added to or updated in the data area of the FROM 13. Accordingly, the information in the file management area on the SDRAM 11 side is updated. Then, as shown in FIG. 5D, when the mobile terminal device 1 is powered off, the information in the file management area on the SDRAM 11 side is transferred to the FROM 13 side. When a predetermined time elapses, the work area information on the SDRAM 11 side is also transferred to the FROM 13 side.

  FIG. 2 is a flowchart schematically showing the control contents mainly performed by the microcomputer 7. In this control process, the processes after S1 are performed in a state where the main power supply from the power supply circuit 21 is on. When the power is turned on, normal operation is performed after initial setting. The initial setting of S2 will be described later.

  This function is used when the mobile terminal device 1 has a function of reading an information code (optical information medium) such as a bar code or a two-dimensional code during the loop in which the process proceeds to No in S3 and proceeds to No in S4. Etc. can be executed. In this case, the microcomputer 7 has the main power supply voltage decreased due to the power switch 51 being operated by the user to shift to power off (power off) (that is, until S4 Yes) or due to the battery 3a being removed or the battery 3a being consumed. It waits until the “low battery” state is detected by the voltage monitoring circuit 10 (that is, until S3 Yes).

  When the power is turned off and the process proceeds to Yes in S4, the microcomputer 7 transfers the information in the file management area on the SDRAM 11 side to the FROM 13 side as shown in FIG. 5D (S5). For example, if the capacity of the file management area is 32 kB, data transfer takes about 600 ms. Thereafter, the microcomputer 7 transfers the work area information of the SDRAM 11 to the FROM 13 side after a predetermined time has elapsed. For example, if the capacity of the work area is about 1 MB, data transfer takes about 10 seconds. Then, the microcomputer 7 sets the low level data in the flip-flop 17 to turn off the FET 43 and outputs a low level signal to the OR gate 53 to stop (turn off) the main power supply. As a result, the backup of the SDRAM 11 is stopped. Even if the backup is stopped and information on the SDRAM 11 is lost in this way, the file management area information and work area information are already transferred to the FROM 13, so that they are retained on the FROM 13 side when the power is turned on again. If the information is transferred to the SDRAM 11 side, the resume function can be realized.

  During the predetermined time (for example, “10 minutes”), if the user operates the power switch 51 to power on the portable terminal device 1 during that period, the state immediately before the previous power off is restored as it is. This is the time set in order to quickly execute the resume function. That is, since the SDRAM 11 is backed up and the work area information is retained as it is for the predetermined time (for example, 10 minutes), the microcomputer 7 can immediately operate based on the information on the work area.

  On the other hand, when the mobile terminal device 1 is normally powered on after S2 (when the voltage of the main power supply is maintained at a predetermined value or higher), the main power supply voltage is removed due to the removal of the battery 2, the exhaustion of the battery 2, or the like. When the “low battery” state is detected by the main power supply voltage monitoring circuit 29, the process proceeds to Yes in S3, and the process of S6 is performed. In addition, when the microcomputer 7 detects that the battery cover is opened by the detection switch 19, the microcomputer 7 may intentionally proceed to Yes in S3. For example, when the user intentionally opens the battery cover of the main body, or when the battery cover is opened by applying an external force to the mobile terminal device 1, in this case, the battery 3 a is removed from the storage unit, or the external force is It is conceivable that the battery 3a falls off from the storage portion due to the impact, and there is a high possibility that the main power supply is cut off. In such a case, it is possible to intentionally determine Yes in S3 and shift to the processing in S6.

  In the process of S6, the file management area is saved in a state where the operation power source is switched to the sub battery 3b. Thereby, important file management data in the latest SDRAM 11 can be backed up. In addition, since the backup of the SDRAM 11 is maintained by the sub-battery 12 for a certain period of time even after the result of S3 becomes Yes, the resume function is effective, and the power supply of the sub-battery 12 is 2.7 V, which is the operating limit voltage of the SDRAM 11. The resume function can be effectively operated if the power supply is restored before the voltage drops below the level.

  On the other hand, when the SDRAM 11, RTC 25, flip-flop 17 and the like are backed up only by the sub-battery 3b, the sub-battery 3b is gradually consumed and the backup power supply voltage gradually decreases. For example, when about 10 minutes have passed and the operation limit voltage of the SDRAM 11 has fallen below 2.7 V, the SDRAM 11 cannot be backed up at that time. At this time, the detection output of the voltage detection circuit 27 becomes low level, and the flip-flop 17 is reset. Then, the FET 43 is turned off, and the supply of backup power to the SDRAM 11 is stopped. In such a case, the save operation of the file management area is completed, but the work area information of the SDRAM 11 has been lost. Therefore, the resume function is executed using the work area based on the saved file management information. Then there is a concern of causing a system failure. In addition, since the information of the latest work area cannot be saved in the FROM 13, it is necessary to cause a system failure even if the resume function is executed based on the information of the file management area saved in the latest and the information of the FROM 13. Therefore, in the present embodiment, such a state is left as a history, and whether this history exists at the next start-up is referred to. If it exists, the initial setting is performed without using the file management information recorded in the FROM 13. Like to do.

(Abnormal history writing operation)
Here, the abnormality history writing operation will be described. FIG. 3 is a flowchart illustrating an abnormality history writing process performed by the second control circuit in the mobile terminal device of FIG. This operation is executed by the second control circuit 9 and is a process that can be executed if at least the power of the auxiliary power supply 5 is maintained.

  As described above, the signal (Q bar signal) from the Q bar terminal of the D flip-flop 41 is input to the second control circuit 9, and the signal (Q bar signal) from the Q bar terminal is low level. It is detected whether or not. When the voltage of the sub-battery 3b exceeds 2.7V (that is, when the input voltage of the voltage detection circuit 27 exceeds 2.7V), the signal from the Q bar terminal of the D flip-flop 41 (Q The bar signal) is maintained at a high level, and in this case, the process proceeds to No in S11. On the other hand, when the supply voltage of the sub-battery 3b reaches 2.7 V or less, the signal (Q bar signal) from the Q bar terminal of the D flip-flop 41 is switched to the low level, and the second control circuit 9 detects this. Then, the process proceeds to Yes in S11. Then, when the second control circuit 9 detects the low-level Q-bar signal of the D flip-flop 41 in this way, the second control circuit 9 writes predetermined flag information (for example, a flag “1”) in the EEPROM 15. The operating power supply for performing this write operation is the auxiliary power supply 5.

In the present embodiment, the second control circuit 9 corresponds to an example of “determination means”, and power supply means (battery 3
a and the sub-battery 3b) function to determine whether or not the power supply from the sub-battery 3b) to the SDRAM 11 (volatile memory) is in a predetermined stop state (a state where the supply voltage is 2.7 V or less). Further, the second control circuit 9 corresponds to an example of “second control means”, operates when supplied with power from the auxiliary power supply 5 and is determined by the determination means to have entered the predetermined stop state. It functions to record at least predetermined abnormality history information in the EEPROM 15 (second non-volatile memory).

  The abnormality history information written in the EEPROM 15 gives an instruction from the microcomputer 7 to the second control circuit 9 when the reset process S23 described later is finished, and the second control circuit 8 receives the instruction and erases the recorded contents. You just have to do it.

Next, processing at the time of initial setting in the mobile terminal device 1 will be described.
The initial setting in the main process of FIG. 2 can be performed as follows, for example. First, in response to power-on from the power supply circuit 21, the microcomputer 7 gives an instruction to the second control circuit 9 to output the recorded contents of the EEPROM 15 (or the microcomputer 7 may directly access the EEPROM 15). Then, it is determined whether or not abnormality history information (for example, the above-mentioned “1” flag) is recorded in the EEPROM 15 (S20). When it is determined that the abnormality history information is recorded in the EEPROM 15 (S20: Yes), a process of notifying the user of the occurrence of an abnormal state is performed (S22). For example, a message indicating that the file management information has been erased or a resetting of the file management information is displayed by a display unit (not shown), or a predetermined sound is output by a buzzer or the like. it can.

  In the present embodiment, the microcomputer 7 and the above-described display and buzzer correspond to an example of “notification means”, and when power supply from the power supply means is started (when main power from the power supply circuit 21 is turned on). In addition, the information stored in the EEPROM 15 (second non-volatile memory) is referred to, and when the abnormality history information is recorded in the EEPROM 15 (second non-volatile memory), a notification process is performed.

  After the process of S22, the file management information is reset, and the activation not based on the existing file management information is performed. In this case, new file management information is created without restoring the file management information as shown in FIG. For example, when data is restored from the data area of the FROM to the SDRAM, new file management information is generated and updated as in the case of downloading.

  If it is determined that the abnormality history information is not recorded in the EEPROM 15 when the power is turned on (S20: No), the normal setting as shown in FIG. 5B is performed, and the initial setting process is terminated ( S21).

(Main effects of this configuration)
In the present embodiment, the FROM 13 (first non-volatile memory) capable of storing data and the SDRAM 11 (volatile) storing file management information (management information) for managing the data stored in the first non-volatile memory. Memory), and data transfer between the volatile memory and the first nonvolatile memory is controlled by the microcomputer 7 (first control means). According to this configuration, the backup information can be managed in the SDRAM 11 (volatile memory) while enabling backup of data to the FROM 13 (first nonvolatile memory).
In this configuration, when no measures are taken, if for some reason the power from the power supply means (battery 3a and sub-battery 3b) is reduced or cut off and the file management information (management information) is erased, for example, There is a problem that backup information cannot be managed at the next startup or the like, and an abnormal startup process is performed. In the present invention, in order to deal with such a problem, the power supply means (battery 3a and sub-battery 3b is used). The auxiliary power supply 5 (auxiliary power supply means) capable of supplying power to at least the second control circuit 9 (second control means) after the supply of power is stopped by the determination means is provided, and the stop state (SDRAM 11 (volatile memory) is determined by the determination means. ), It is determined that the operating power has not been maintained) and the power supply is supplied from the auxiliary power source 5 (auxiliary power source means). The second control circuit 9 for (second control means), and recording at least a predetermined abnormality history information in EEPROM 15 (second nonvolatile memory). Therefore, the loss of file management information in the SDRAM 11 (volatile memory) can be left as an abnormality history in the EEPROM 15 (second non-volatile memory), and it is assumed that such file management information is lost at the next startup. Can be activated. For example, if startup is performed without using the file management information in the FROM 13 (first nonvolatile memory) at the time of startup when the abnormality history remains, the management in the FROM 13 (first nonvolatile memory) is temporarily performed. Even if the information is insufficient or inconsistent, a system failure or the like caused by the information is not caused.

Further, in this configuration, a battery 3a (first power supply) and a sub battery 3b (second power supply) for supplying power to at least the volatile memory are provided as power supply means, and the SDRAM 11 (volatile memory) When the power supply from the battery 3a (first power supply) is stopped or when a predetermined low level state is reached, the stored contents are maintained based on the power supply from the sub-battery 3b (second power supply). Yes. In this configuration, even when the power supply from the battery 3a (first power supply) is at a level where the stored contents of the SDRAM 11 (volatile memory) cannot be maintained (for example, when an instantaneous interruption occurs), the sub battery 3b The stored contents of the SDRAM 11 (volatile memory) can be maintained based on the power supply from the (second power supply).
In such a configuration, the determination means further determines whether or not the power supply from the sub-battery 3b (second power supply) to the SDRAM 11 (volatile memory) is stopped, and the second control circuit 9 ( The second control means) has an auxiliary power supply 5 (auxiliary power supply means) different from the sub battery 3b (second power supply) when the determination means determines that the power supply from the sub battery 3b (second power supply) is stopped. The abnormality history information is written in the EEPROM 15 (second non-volatile memory) based on the power supply from (). That is, even when the sub-battery 3b (second power source) becomes insufficient, the EEPROM 15 is based on the power supply from the auxiliary power means different from the battery 3a (first power source) and the sub-battery 3b (second power source). The abnormality history information can be written in (second non-volatile memory). In particular, in this configuration, when the sub-battery 3b (second power source) is sufficiently maintained, it is not necessary to perform an operation of writing an abnormality history as the sub-battery 3b (second power source) can cope with it. When abnormality occurs up to the battery 3b (second power supply), an abnormality history can be written as a final means.

  Further, in the present embodiment, when the power supply from the power supply means is started (that is, when the main power supply is supplied into the apparatus), the recorded contents of the EEPROM 15 (second non-volatile memory) are referred to. At the same time, there is provided an informing means for performing an informing process when abnormality history information is recorded in the EEPROM 15 (second non-volatile memory). According to this configuration, it is possible to notify the user or the like that the content of the SDRAM 11 (volatile memory) has disappeared, and to prompt the user or the like to take an appropriate action.

  Further, the second nonvolatile memory is a memory having a larger allowable number of writing times than the first nonvolatile memory. In this configuration, the frequency of writing to the first nonvolatile memory can be reduced and the life of the first nonvolatile memory can be extended by not writing or reducing the abnormality history to the first nonvolatile memory. Can do.

[Other Embodiments]
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  The volatile memory is not limited to the SDRAM 11, but may be a DRAM, an SRAM, or the like.

  The first nonvolatile memory is not limited to the FROM, but may be another known nonvolatile memory (EEPROM, Fe (Ferroelectric) RAM, M (Magneto resistive) RAM, etc.).

  Further, the second non-volatile memory is not limited to the EEPROM, but may be another known non-volatile memory (FROM, FeRAM, MRAM, etc.).

  The portable terminal device is not limited to a configuration that reads an information code (optical information medium) such as a barcode or a two-dimensional code, and can be applied to any device including a volatile memory and a nonvolatile memory.

  As described above, the reason why the power supply from the battery 3a is cut off is that when the battery 3a is detached due to a drop impact of the mobile terminal device 1, or when the battery 3a is removed by an unintended operation, Other situations such as a case where the power supply system stops due to the occurrence of static electricity are not limited to the case where the battery voltage rapidly decreases due to the cause.

  In the above embodiment, the second control circuit 9 is configured to write the abnormality history information to the EEPROM 15, but the transfer history information and the like may be written together with the abnormality history information. For example, when the SDRAM 11 is erased (when the sub-battery is low), the data in the SDRAM 11 work area and the data area in the FROM 13 coincide with each other, and the file management information immediately before the erase can be saved in the FROM 13. The resume operation can be performed as usual by using the file management information in the FROM 13 and the information in the data area. Therefore, if information that can specify that the data in the work area of the SDRAM 11 and the data area in the FROM 13 at the time of erasure is written together with the abnormality history in S12, these data are stored in the process of S23. Normal processing can be performed on the assumption that the information is consistent.

  In the above embodiment, the second control circuit 9 is configured to perform the write operation to the EEPROM 15. However, the second control circuit 9 may be configured to transfer data from the SDRAM 11 to the EEPROM 15. For example, the capacity of the auxiliary power supply 5 may be increased to some extent, and the file management information may be written to the EEPROM 15 when the main power supply is switched to the sub battery.

DESCRIPTION OF SYMBOLS 1 ... Portable terminal device 3 ... Power supply means 3a ... Battery (1st power supply)
3b ... Sub battery (second power supply)
5. Auxiliary power supply (auxiliary power supply means)
7. Microcomputer (first control means, notification means)
9. Second control circuit (second control means)
11 ... SDRAM (volatile memory)
13 ... FROM (first nonvolatile memory)
15 ... EEPROM (second non-volatile memory)
27. Voltage detection circuit (determination means)

Claims (4)

A first nonvolatile memory capable of storing data;
A volatile memory configured to store data when receiving power supply, and storing management information for managing the data stored in the first nonvolatile memory;
First control means for controlling data transfer between the volatile memory and the first nonvolatile memory;
Power supply means for supplying power for operation to at least the volatile memory and other electronic components;
A second non-volatile memory different from the first non-volatile memory;
Second control means for controlling writing of data to the second nonvolatile memory;
An auxiliary power supply means capable of supplying power to at least the second control means after stopping the power supply by the power supply means;
Determining means for determining whether power supply from the power supply means to the volatile memory is in a predetermined stop state;
With
The second control means operates by receiving power supply from the auxiliary power supply means, and when the determination means determines that the stop state has occurred, at least predetermined abnormality history information is stored in the second nonvolatile memory. Recorded in
The power supply means has a first power supply and a second power supply for supplying power to at least the volatile memory,
The volatile memory is configured to maintain stored contents based on the power supply from the second power supply when the power supply from the first power supply is stopped or in a predetermined low level state,
The determination means determines whether power supply from the second power source to the volatile memory is stopped.
The second control means, based on the power supply from the auxiliary power supply means different from the second power supply, when the determination means determines that the power supply from the second power supply is in the stopped state. mobile terminal you and writes the abnormality history information on the second non-volatile memory.   The said 2nd control means performs the transfer of the data from the said volatile memory to the said 2nd non-volatile memory, when it is judged by the said judgment means that it became the said stop state. The portable terminal device described.   Notification that refers to the recorded contents of the second nonvolatile memory when power supply from the power supply means is started and performs notification processing when the abnormality history information is recorded in the second nonvolatile memory The mobile terminal device according to claim 1, further comprising means.   The portable terminal device according to any one of claims 1 to 3, wherein the second nonvolatile memory is a memory having a larger number of allowable writes than the first nonvolatile memory.

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