JP5286814B2 - Semiconductor device, portable electronic device, self-diagnosis method, self-diagnosis program - Google Patents

Description

  The present invention relates to a semiconductor device having a self-diagnosis function, a portable electronic device, a self-diagnosis method, and a self-diagnosis program.

Conventionally, a portable electronic device on which an electronic device such as an IC card is mounted has been used. Some of such electronic devices have a self-diagnosis function that performs whether or not the device itself can normally operate. As a technique for performing such self-diagnosis, for example, Patent Document 1 shown below can be cited.
In the system shown in Patent Document 1, when a command is transmitted from an external device while the card is performing self-diagnosis, the self-diagnosis process is interrupted and a process of receiving the command is performed. When the reception of the command is completed, the self-diagnosis is resumed. When the self-diagnosis is completed, the received command is processed. Thereby, self-diagnosis is performed.
Japanese Patent No. 3590338

However, in the self-diagnosis technique shown in Patent Document 1 described above, the self-diagnosis is restarted after the completion of the command reception, and when the self-diagnosis is completed, the received command is processed. If this happens, the time until the received command is executed is also prolonged, and there is a problem that the time until the command processing is completed is delayed as a whole system.
Here, in recent years, the memory area mounted on the electronic device has become very large, and as a result, the area to be subjected to self-diagnosis also increases, which further increases the time required for self-diagnosis. The start of command processing will be delayed.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a semiconductor device and a portable electronic device capable of performing self-diagnosis while reducing the delay in starting command processing. It is to provide a self-diagnosis method and a self-diagnosis program.

  In order to solve the above-mentioned problem, the present invention provides a semiconductor device mounted on an electronic device that transmits and receives information to and from an external device, and receives a command transmitted from the external device. A command processing unit that processes the command received by the command receiving unit and transmits a processing result to the external device, and a command reception waiting period that is a period during which the command processing unit is not processing. A self-diagnosis unit for performing a self-diagnosis, which is a diagnosis of whether or not the apparatus is normally operable, a storage unit for storing a history of self-diagnosis performed by the self-diagnosis unit, and each time the self-diagnosis is performed, When the result of self-diagnosis is written in the storage unit and a command is transmitted from an external device, the self-diagnosis of the self-diagnosis unit is stopped and the command reception unit receives the command. And having a control unit for.

  According to the present invention, in the semiconductor device described above, the target to be self-diagnosis is divided into a plurality of divided blocks, and the control unit causes the self-diagnosis unit to perform self-diagnosis in order for each of the divided blocks. The self-diagnosis history is written in the storage unit for the divided blocks that have undergone self-diagnosis, and the self-diagnosis unit refers to the storage unit when performing self-diagnosis, and the divided blocks that have not been self-diagnosed A self-diagnosis is performed on the subject.

  Further, according to the present invention, in the semiconductor device described above, the order in which the divided blocks perform self-diagnosis is set, and the self-diagnosis unit refers to the storage unit and performs self-diagnosis when performing self-diagnosis. The self-diagnosis is performed according to the above order for the divided blocks that have not been performed.

  In the semiconductor device described above, the self-diagnostic unit may stop when the self-diagnosis is stopped while performing the self-diagnosis on the divided block, and then reaches a command reception waiting period. In addition, the self-diagnosis is performed from the block where the self-diagnosis is stopped.

  In addition, the present invention is a portable electronic device that transmits and receives information to and from an external device, the command receiving unit receiving a command transmitted from the external device, and the command received by the command receiving unit The portable electronic device can operate normally in a command processing unit that performs the above processing and transmits a processing result to the external device, and a command reception waiting period that is a period during which the command processing unit is not performing processing. A self-diagnosis unit that performs self-diagnosis, which is a diagnosis of whether or not there is, a storage unit that stores a history of self-diagnosis performed by the self-diagnosis unit, and a result of the self-diagnosis each time the self-diagnosis is performed And a control unit for stopping the self-diagnosis of the self-diagnosis unit and receiving the command by the command reception unit when a command is transmitted from an external device. The features.

  The present invention is also a self-diagnosis method in a portable electronic device that transmits and receives information to and from an external device, wherein the electronic device receives a command transmitted from the external device and receives the command Whether or not the portable electronic device can operate normally during a command reception waiting period in which a command is processed and a processing result is transmitted to the external device and the command is not processed. Each time the self-diagnosis is performed, the result of the self-diagnosis is written in the storage unit, and when a command is transmitted from the external device, the self-diagnosis is stopped and the command is received. It is characterized by making it.

  In addition, the present invention provides an electronic device, which is a portable computer that transmits and receives information to and from an external device, means for receiving a command transmitted from the external device, and processes the received command Means for transmitting the result to the external device, and a self-diagnosis, which is a diagnosis of whether or not the portable electronic device can normally operate during a command reception waiting period, which is a period during which the command is not processed. Means for writing the result of the self-diagnosis to the storage unit each time the self-diagnosis is performed; means for stopping the self-diagnosis and receiving the command when a command is transmitted from the external device; It is a self-diagnosis program to function as.

  As described above, according to the present invention, the self-diagnosis is performed while storing the history of the self-diagnosis during the command reception waiting period, which is a period in which the command processing is not performed, and the command is received from the external device. When the command is input, the self-diagnosis is stopped, the command is received, and the command is processed. Therefore, it is possible to perform the self-diagnosis with reduced influence on the command processing.

  Further, according to the present invention, the self-diagnosis is performed for each block, and when the self-diagnosis of one block is completed, the fact that the diagnosis is completed is stored as a history. Based on the history of the divided blocks, the self-diagnosis is performed on the divided blocks that are not subjected to the self-diagnosis process. This makes it possible to diagnose each of the divided blocks to be diagnosed using the command reception waiting period.

  Hereinafter, an electronic device according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, the electronic device is configured to be portable, for example, an IC card on which a semiconductor device is mounted. The electronic device and the external device are connected, and information can be transmitted and received between the electronic device and the external device. Here, when the electronic device is an IC card, the electronic device is connected to a terminal device, which is an external device, via a device such as a reader / writer. In the following embodiments, a case where the electronic device is an IC card will be described.

FIG. 1 is a schematic block diagram showing the configuration of an IC card 1 according to an embodiment of the present invention.
In this figure, an IC card 1 includes a CPU (central processing unit) 10, a ROM (read-only memory) 11, a RAM (random-access memory) 12, an EEPROM (electrically erasable programmable memory) 13, an I / O. (Input / Output) 14 is connected via the bus 20. The CPU 10 uses the information stored in the ROM 11, RAM 12, and EEPROM 13 to transmit / receive information to / from the terminal device through the I / O 14 and perform various command processes.

  The I / O 14 has a function of receiving a command transmitted from an external device such as a terminal device (corresponding to the command receiving unit described above). The EEPROM 13 stores a history of self-diagnosis performed by the CPU 10 (corresponding to the above-described self-diagnosis unit) (corresponding to the above-described storage unit).

The CPU 10 has a function of processing a command received by the I / O 14 and transmitting a processing result to an external device via the I / O 14 (corresponding to the command processing unit described above).
Further, the CPU 10 has a function of performing a self-diagnosis, which is a diagnosis of whether or not the IC card 1 can normally operate during a command reception waiting period, which is a period during which no command processing is performed (the self-diagnosis unit described above). Equivalent).
Further, the CPU 10 has a function of writing the result of self-diagnosis into the EEPROM 13 every time the self-diagnosis is performed, and stopping the self-diagnosis and receiving the command by the I / O 14 when a command is transmitted from an external device (described above). Equivalent to the control unit).

Here, the target of self-diagnosis is, for example, a memory area in the IC card 1, whether or not the data stored in the memory area is normal, and data and programs stored in the memory area. A diagnosis is made as to whether or not each function in the IC card 1 using the function functions normally.
The memory area to be diagnosed is divided into a plurality of divided blocks. This divided block may be a logical block or a physical block.

  Further, the CPU 10 performs self-diagnosis in order for each divided block, and writes a self-diagnosis history of the divided block in which self-diagnosis has been performed in the EEPROM 13. When the self-diagnosis is resumed, the EEPROM 13 is referred to, and the self-diagnosis is performed on the divided blocks that have not been diagnosed yet, except for the divided blocks that are stored as the self-diagnosis completed. Here, the diagnosis order of the divided blocks for performing the self-diagnosis is determined in advance, and the self-diagnosis processing is performed in accordance with the order from the divided block that is the next order of the divided blocks stored in the EEPROM 13 after the self-diagnosis is completed. Is also possible.

  Furthermore, the CPU 10 processes various commands, and has a function of performing an interrupt signal monitoring process for monitoring whether or not there is an interrupt signal during the command processing. When an interrupt signal is generated, the CPU 10 performs a current process. The command processing is stopped and the processing in which the interrupt is generated is executed.

Next, the operation of the IC card 1 in the above-described configuration will be sequentially described with reference to the flowcharts of FIGS. FIG. 2 is a flowchart illustrating processing for monitoring an interrupt signal.
When power is supplied and the IC card 1 is activated, the CPU 10 detects whether or not an interrupt signal is output from a terminal device connected to the outside (step S11), and based on the detection result, the interrupt signal is detected. Is input from the terminal device to the IC card 1 (step S12). If no interrupt signal is input in the determination result, the process proceeds to step S11. If an interrupt signal is input, the command process in step S13 is executed, and the interrupt signal detection process is terminated.

Next, command processing will be described with reference to the flowchart of FIG.
When the interrupt signal is generated, the CPU 10 starts command processing.
When the interrupt signal is generated, the CPU 10 receives a command transmitted from the terminal device via the I / O 14 (step S21). When the reception of this command ends (step S22), the CPU 10 performs a process corresponding to this command (step S23), and transmits a response signal notifying that this process is completed to the terminal device (step S24).

  When the response signal is transmitted to the terminal device, the CPU 10 waits for the next command transmitted from the terminal device (step S25). The reception of this command is performed, for example, in parallel with the interrupt signal monitoring process shown in FIG. Then, the CPU 10 performs self-diagnosis according to a predetermined order among the divided blocks that have not been self-diagnosed (step S26). Here, every time the self-diagnosis process for one divided block is completed, the CPU 10 writes information indicating the divided block for which the self-diagnosis has been completed into the EEPROM 13 (step S27), and the self-diagnosis in step S26 and the diagnosis history in step S27. Is repeatedly performed until it is determined in step S12 in FIG. 2 that the interrupt signal is “present”.

  When it is determined in step S12 in FIG. 2 that the interrupt signal is “present”, the CPU 10 stops the self-diagnosis process and performs a process according to the interrupt signal. Here, for example, when an interrupt signal is input, the process proceeds to step S13 in FIG. 2 to shift to the command reception process in step S21 in FIG. Then, when performing the self-diagnosis in step S26, the diagnosis history is referred to, a divided block to be executed next to the divided block for which self-diagnosis has been completed is detected, and self-diagnosis is performed from the detected divided block.

The embodiment described above will be further described. FIG. 4 is a diagram for explaining received command processing and self-diagnosis processing.
When the IC card 1 is connected to the terminal device and receives power supply (t1), the IC card 1 outputs an initial response (ATR: Answer To Reset) signal to the terminal device (t2) and waits for reception of a command signal (t3). ). In the period of t3, the CPU 10 diagnoses the divided block A and stores the diagnosis history.
Next, when the first command is input together with the interrupt signal, the self-diagnosis process is stopped, the first command is received (t4), and when the reception is completed, the received first command is processed (t5). When the processing is completed, the command processing result is transmitted as a response to the terminal device (t6). Then, the process shifts to a command reception waiting state (t7) and self-diagnosis is performed (t7). Here, based on the history of completion of the area A, the diagnosis is performed for the area B that is determined as the area to be diagnosed next to the area A, and when the self-diagnosis of this area is completed, the diagnosis history Remember. When the interrupt signal is input and the second command is input, the second command is received (t8). When the reception is completed, the second command is processed (t9).

In the embodiment described above, the interrupt signal is monitored while performing the self-diagnosis process during the command reception waiting period, that is, the period when the process of the CPU 10 is not performed conventionally (sleep). Therefore, it is possible to reduce the influence on command processing and perform self-diagnosis.
In this embodiment, self-diagnosis is performed for each block, and when the self-diagnosis of one block is completed, the fact that the diagnosis is completed is stored as a history. As a result, if an interrupt signal is received during the self-diagnosis of a certain divided block, the self-diagnosis is immediately stopped even in the middle of the self-diagnosis of a certain divided block, and the interrupt signal is Process. Then, after the processing for the interrupt signal (command processing and response transmission) ends, the process proceeds to self-diagnosis processing, refers to the history of self-diagnosis, and the next divided block after the self-diagnosis block, The self-diagnosis process is started from the divided block where the self-diagnosis process is stopped halfway. As a result, the area (divided block) that is the target of the self-diagnosis process can be diagnosed in order using the period in which the CPU 10 normally goes to sleep.
In addition, as shown in FIG. 5, when performing the diagnosis of a divided block in order, you may make it perform a permanent screening. That is, when performing the self-diagnosis process from the area A to the area X, the self-diagnosis process may be performed in order from the area A, and when the area X ends, the self-diagnosis process may be performed again from the area A again.

  In the embodiment described above, the case where the IC card 1 is provided with the self-diagnosis function has been described. However, the functions of the CPU 10 and the EEPROM 13 described above may be mounted on the semiconductor device. As a result, an IC card can be configured using this semiconductor device, or self-diagnosis can be performed by incorporating it into another electronic device.

  Further, the program for realizing the function of the CPU 10 in FIG. 1 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed, thereby executing the interrupt management process and the self. A diagnostic process may be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

1 is a schematic block diagram showing a configuration of an IC card 1 according to an embodiment of the present invention. It is a flowchart explaining the process which monitors an interrupt signal. It is a flowchart explaining command processing. It is a figure explaining the process of the received command, and a self-diagnosis process. It is drawing explaining the case where the diagnosis of a divided block is performed in order.

Explanation of symbols

1 IC card 10 CPU
11 ROM
12 RAM
13 EEPROM
14 I / O
20 buses

Claims (6)

A semiconductor device mounted on an electronic device that transmits and receives information to and from an external device,
A command receiving unit for receiving a command transmitted from the external device;
A command processing unit for processing a command received by the command receiving unit and transmitting a processing result to the external device;
Means for performing an interrupt signal monitoring process for monitoring whether an interrupt signal is input from the external device after the processing result is transmitted to the external device by the command processing unit;
Diagnosing whether the semiconductor device can operate normally during a command reception waiting period, which is a period from when the command processing unit transmits a processing result to the external device to when the interrupt signal is input. A self-diagnosis unit for performing a self-diagnosis;
A storage unit for storing a history of self-diagnosis performed by the self-diagnosis unit;
Each time the self-diagnosis is performed, the result of the self-diagnosis is written to the storage unit, and when the interrupt signal is transmitted from an external device and a command is transmitted, the self-diagnosis unit stops the self-diagnosis and receives the command A control unit for receiving commands by the unit ,
The target for performing the self-diagnosis is divided into a plurality of divided blocks;
The control unit causes the self-diagnosis unit to perform self-diagnosis in order for each of the divided blocks, and writes a history of self-diagnosis to the storage unit for the divided blocks for which self-diagnosis is performed,
The self-diagnosis unit, when performing self-diagnosis, refers to the storage unit and performs self-diagnosis on a divided block on which the self-diagnosis is not performed . The self-diagnosis unit is performing self-diagnosis of the divided block when the interrupt signal is input and the control unit is instructed to stop self-diagnosis during the self-diagnosis of the divided block. Even after that, the self-diagnosis is immediately stopped, and after processing of the command according to the interrupt signal and transmission of the processing result are performed, until the next interrupt signal is input from the external device, The semiconductor device according to claim 1 , wherein the self-diagnosis is performed from a block in which the self-diagnosis processing is stopped halfway with reference to the storage unit . The division block has an order for performing self-diagnosis, and
The self-diagnosis unit, when performing the self-diagnosis, with reference to the storage unit, according to claim 1 or claim 2, wherein the divided blocks which the self-diagnosis has not been performed and performing a self-diagnosis in accordance with the order Semiconductor device. A portable electronic device that transmits and receives information to and from an external device,
A command receiving unit for receiving a command transmitted from the external device;
A command processing unit for processing a command received by the command receiving unit and transmitting a processing result to the external device;
Means for performing an interrupt signal monitoring process for monitoring whether an interrupt signal is input from the external device after the processing result is transmitted to the external device by the command processing unit;
Whether or not the portable electronic device can operate normally during a command reception waiting period that is a period from when the command processing unit transmits a processing result to the external device until the interrupt signal is input A self-diagnosis unit that performs self-diagnosis,
A storage unit for storing a history of self-diagnosis performed by the self-diagnosis unit;
Each time the self-diagnosis is performed, the result of the self-diagnosis is written to the storage unit, and when the interrupt signal is transmitted from an external device and a command is transmitted, the self-diagnosis unit stops the self-diagnosis and receives the command A control unit for receiving commands by the unit ,
The target for performing the self-diagnosis is divided into a plurality of divided blocks;
The control unit causes the self-diagnosis unit to perform self-diagnosis in order for each of the divided blocks, and writes a history of self-diagnosis to the storage unit for the divided blocks for which self-diagnosis is performed,
The self-diagnosis unit, when performing self-diagnosis, refers to the storage unit and performs self-diagnosis on a divided block on which the self-diagnosis is not performed . A self-diagnosis method in a portable electronic device that transmits / receives information to / from an external device,
The electronic device is
Receiving a command transmitted from the external device;
Process the received command and send the processing result to the external device;
After the processing result is transmitted to the external device, it is monitored whether an interrupt signal is input from the external device,
It is a diagnosis as to whether or not the portable electronic device can operate normally during a command reception waiting period, which is a period from when the processing result is transmitted to the external device until the interrupt signal is input. Perform self-diagnosis,
Each time the self-diagnosis is performed, the result of the self-diagnosis is written in a storage unit, and when a command is transmitted from the external device, the self-diagnosis is stopped, and the command is received .
The target for performing the self-diagnosis is divided into a plurality of divided blocks;
Have the self-diagnosis unit perform self-diagnosis in order for each of the divided blocks, write a history of self-diagnosis in the storage unit for the divided blocks for which self-diagnosis has been performed,
When performing the self-diagnosis, the self-diagnosis method is characterized by referring to the storage unit and performing self-diagnosis on a divided block on which the self-diagnosis is not performed . Electronic devices that are portable computers that send and receive information to and from external devices
Means for receiving a command transmitted from the external device;
Means for processing the received command and transmitting a processing result to the external device;
Means for monitoring whether an interrupt signal is input from the external device after the processing result is transmitted to the external device;
It is a diagnosis as to whether or not the portable electronic device can operate normally during a command reception waiting period, which is a period from when the processing result is transmitted to the external device until the interrupt signal is input. Means for self-diagnosis,
The write the results of the self-diagnosis every time performing a self-diagnosis in the storage unit, wherein when a command from the external device is transmitted, to stop the self-diagnosis, it means for the reception of the command,
The target for performing the self-diagnosis is divided into a plurality of divided blocks;
Means for causing the self-diagnosis unit to perform self-diagnosis in order for each of the divided blocks, and writing a history of self-diagnosis in the storage unit for the divided blocks for which self-diagnosis has been performed;
When performing the self-diagnosis, means for performing self-diagnosis with reference to the storage unit and for the divided blocks for which the self-diagnosis has not been performed,
Self-diagnosis program to function as

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