JP2008276794A - Mobile communication terminal - Google Patents

Abstract

When an external device is connected to a mobile communication device, if the specification of the external device is not compatible, it is prevented from being electrically connected, thereby preventing a malfunction and failure of the mobile communication terminal in advance. To improve performance.
An authentication procedure is executed with a connected external device to determine the device type and manufacturer name, that is, the specification of the external device, and the external device can connect to its own terminal based on the determination result. It is determined whether it is a proper device. When it is determined that the device cannot be connected, the external device is set to a non-connected state.
[Selection] Figure 3

Description

  The present invention relates to a portable communication terminal used in a mobile communication system adopting, for example, a W-CDMA (Wideband-Code Division Multiple Access) system.

  The W-CDMA system has been standardized as a system for realizing the next-generation mobile phone system, and various developments of communication devices used in this type of system are currently underway.

  For example, it is proposed that a portable communication terminal is provided with a connector having a USB (Universal Serial Bus) terminal. When a USB interface is used as an external connection interface, a mobile communication terminal can be easily connected to a personal computer, and external devices such as a BT (Bluetooth) (registered trademark) unit, a memory card, and a keyboard are connected to the mobile communication terminal. Can be easily connected. Then, management data such as a telephone directory is transferred from the personal computer to the mobile communication terminal and registered in a batch, or the functions of the mobile communication terminal are appropriately selected by selectively using the various external devices as necessary. It becomes possible to expand.

  However, when signal transfer is performed between a plurality of devices using a USB interface, it is necessary to provide at least one device with a USB host function. Because this USB host function has a heavy processing load, it is usually given to a device with a high processing capacity such as a personal computer. On the other hand, peripheral devices such as keyboards and mice, as well as small devices such as portable communication terminals, have USB slave functions It is common to have For this reason, even if an external device such as a BT (Bluetooth) (registered trademark) unit, a memory card, or a keyboard is connected to the mobile communication terminal, both have only a USB slave function. Can not do.

  In order to solve this, the portable communication terminal may have a USB host function. However, if this is done, it is necessary to provide the mobile communication terminal with a large-capacity memory and a CPU with a high processing capability, resulting in an increase in power consumption and cost increase of the mobile communication terminal.

  On the other hand, instead of providing the portable communication terminal with a USB host function, it is also conceivable to provide another general-purpose interface such as a serial interface. In this way, it is not necessary to provide a large-capacity memory or a CPU with high processing capability in the mobile communication terminal. However, it is necessary to provide a serial interface connector in addition to a connector having a USB terminal, which is a major obstacle to miniaturization of the portable communication terminal.

Also, even if the external connection interface is compatible between the mobile communication terminal and the external device, if the specifications of the external device are different, the mobile communication terminal may malfunction or break down depending on the external device. It is not preferable.
On the other hand, in the field of computer networks, for example, when a client machine is connected to a host machine to perform communication, the machine machine specific information of the client machine is sent to the host machine, and the machine machine sends the machine machine specific information to the user machine. An authentication method has been proposed in which it is determined whether or not it is registered in a database, and access is permitted when it is registered (see, for example, Patent Document 1).
JP-A-10-260939

  However, the previously proposed authentication method is intended to protect legitimate users' privacy and prevent intruders from entering the network, and the host machine and the client machine are connected via the network. It defines the authentication procedure to be performed after connection. For this reason, as described above, it is impossible to detect the nonconformity of the specifications of the external device when the external device is electrically connected to the mobile communication device via the cable and the connector. Therefore, the malfunction or failure of the mobile communication terminal due to the nonconformity with the specifications of the external device cannot be prevented.

  This invention was made paying attention to the above circumstances, and its purpose is to prevent electrical connection when the specification of the external device is incompatible when connecting the external device to the portable communication device, Accordingly, it is an object of the present invention to provide a mobile communication terminal that prevents the malfunction and failure of the mobile communication terminal and improves the reliability.

  In order to achieve the above object, one aspect of the present invention includes a mobile communication terminal main body, and one type of external connection connector having a predetermined terminal arrangement structure to which an external device is connected via a cable. In the portable communication terminal, the portable communication terminal main body is connected to an external device through the cable and the connector for connection to the external device, and the external device is connected to the connector for external connection. Detecting means for detecting the type and specification of the external device based on the result of the authentication, executing an authentication procedure with the external device via the external interface Based on the detection result of the type and specification of the external device, determination means for determining whether the external device is a device that can be connected to the terminal or a device that cannot be connected, and the external device When it is determined that the device is connectable to the terminal, the device maintains the connection between the external connection connector and the mobile communication terminal main body, while the external device cannot connect to the terminal. If it is determined that the connection is established, connection control means for electrically disconnecting the connection between the connector for external connection and the main body of the mobile communication terminal is provided.

  Therefore, according to one aspect of the present invention, when an external device is connected to a mobile communication device, it can be prevented from being electrically connected if the specification of the external device is incompatible. In addition, it is possible to provide a portable communication terminal that prevents the occurrence of a failure and improves the reliability.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows an embodiment of a portable communication terminal according to the present invention. The mobile communication terminal of this embodiment includes a host CPU 1, a USB interface 2, a serial control signal interface 3, a switch circuit 4, and a system connector 5 as components necessary for connection to an external device. Is provided.

  First of all, the system connector 5 is for connecting an external device (not shown) to its own portable communication terminal, and has a total of 11 terminals (pins) P1 to P10 and PRF. FIG. 2 shows the names and functions of these pins P1 to P10 and PRF.

  Of all 11 pins P1 to P10 and PRF, pins P1 to P4 are used for USB connection. Among these, P2 and P3 are USB data transfer pins USBD + and USBD-, respectively, and bidirectional transfer of data is performed between these pins and an external device (not shown). P4 is a USB power input pin to which a USB power voltage (4.75 to 5.25 V) supplied from an external device is input. P1 is a USB ground pin.

  Of all the 11 pins P1 to P10 and PRF, pins P5 and P6 are charging power input pins, and charge voltage and current supplied from a charger which is one of external devices are supplied to a battery circuit (not shown). Supply. The pin P7 is a synchronous clock output pin, and outputs synchronous clock (64 kHz) to the external device when performing synchronous communication with the external device. The electrical condition of the synchronous clock output pin P7 is CMOS 2V ± 0.2V, and is set to high impedance (200 kΩ or more) when not in use.

  Furthermore, the pins P8 and P9 are a manufacturer option pin and a reserved pin, respectively. In this embodiment, serial data is transferred to and from an external device using these pins P8 and P9. The electrical condition of the manufacturer option pin is defined so that the input voltage is 3.6 V or less, and is set to high impedance (200 kΩ or more) when not in use.

  The USB interface 2 includes a USB device controller 21 and a detection circuit 22. The USB device controller 21 has a USB interface slave function, and is connected to an external device such as a personal computer having a USB host function via the USB data transfer pins P2 and P3 of the system connector 5. Perform data transfer.

  The detection circuit 22 takes in an interface identification voltage supplied from an external device via the USB power input pin P4 of the system connector 5 and detects the voltage value. In this embodiment, the value of the interface identification voltage generated by an external device having no USB host function is set to the USB power supply voltage (4.75 to 5.25 V generated by the external device having a USB host function. ) Is set to a different value (for example, 2V), and the detection circuit 22 detects each of these voltage values and gives the detection result to the host CPU 1.

  The serial control signal interface 3 transmits and receives the serial control signal when performing signal transfer with the external device using the serial interface. In this embodiment, the serial control signal is transferred via the USB data transfer pins P2 and P3 of the system connector 5.

  The host CPU 1 is provided with a serial data interface 11. The serial data interface 11 transmits and receives serial data when performing signal transfer with an external device using the serial interface. In this embodiment, the serial data is transferred using the manufacturer option pin P8 and the reservation pin P9 of the system connector 5.

  By the way, a switch circuit 4 is installed between each of the external interfaces, that is, the USB interface 2, the serial control signal interface 3, the serial data interface 11 in the host CPU 1, and the system connector 5. The switch circuit 4 includes a first changeover switch 41 and a second changeover switch 42. These first and second changeover switches 41 and 42 perform a switching operation in conjunction with each other in accordance with a changeover control signal SWC generated from the host CPU1.

  The first changeover switch 41 switches the connection of the USB device controller 21 and the serial control signal interface 3 to the USB data transfer pins P <b> 2 and P <b> 3 of the system connector 5. On the other hand, the second changeover switch 42 turns on / off the connection of the serial data interface 11 to the manufacturer option pin P8 and the reservation pin P9 of the system connector 5.

  The host CPU 1 includes a first determination unit 1a, an interface selection control unit 1b, a second determination unit 1c, and a connection control unit 1d as new functions according to the present invention.

  First of all, the first determination means 1a takes in the detected value of the interface identification voltage from the detection circuit 22 of the USB interface 2 when an external device is connected to the system connector 5, and also provides the detected value of the interface identification voltage. In addition, it is determined whether or not the connected external device has a USB host function.

  The interface selection control unit 1b provides the switching control signal SWC to the switch circuit 4 based on the determination result by the first determination unit 1a. When it is determined that the external device has a USB host function, the first changeover switch 41 connects the USB device controller 21 to the USB data transfer pins P2 and P3, and the second changeover switch. 42 turns off the connection between the serial data interface 11 and the manufacturer option pin P8 and the reservation pin P9. On the other hand, when it is determined that the external device does not have a USB host function, the first changeover switch 41 connects the serial control signal interface 3 to the USB data transfer pins P2 and P3 and the second changeover switch. 42 turns on the connection between the serial data interface 11 and the manufacturer option pin P8 and the reservation pin P9.

  The second determination means 1c is connected to the USB device controller 21 or the serial control signal in a state where the interfaces 2, 3, 11 and the system connector 5 are selectively connected by the control of the interface selection control means 1b. An ID request command is transmitted to the external device via the interface 3. Then, when the device ID and the manufacturer ID are sent from the external device, the type of the external device and the specifications different for each manufacturer are determined based on the device ID and the manufacturer ID.

  The connection control unit 1d determines whether the connected external device is a device that can be connected to its own mobile communication terminal based on the determination result by the second determination unit 1c. In this case, the connection between the system connector 5 and the terminal body is electrically disconnected.

Next, the operation of the mobile communication terminal configured as described above will be described using the flowchart shown in FIG.
Here, a case where a personal computer PC having a USB host function and a memory card ES not having a USB host function are connected to the mobile communication terminal MS will be described as examples.

(1) When connecting a personal computer PC
Assume that a personal computer PC is connected to the mobile communication terminal MS via the USB cable 7 as shown in FIG. Then, in step 4a, the personal computer PC generates the USB power supply voltage (4.75 to 5.25V) by the voltage generator 62 provided for generating the USB power supply voltage. The USB power supply voltage is supplied to the mobile communication terminal MS via the USB cable 7 and the USB power supply pin P4 (VBUS), and is input to the detection circuit 22 in the USB interface 2. When detecting the input of the power supply voltage, the detection circuit 22 gives an interrupt signal to the host CPU 1.

  The host CPU 1 of the mobile communication terminal MS monitors the input of an interrupt signal in step 3b after performing initialization processing in step 3a. In this state, when an interrupt signal is input from the detection circuit 22, the host CPU 1 determines that an external device is connected to the system connector 5, and after inputting a voltage detection value from the detection circuit 22 in step 3c, Based on this voltage detection value, it is determined in step 3d whether the external device has a USB host function.

  For example, if the detected voltage value is a USB power supply voltage (4.75 to 5.25 V), it is determined that the connected external device is a device having a USB host function. On the other hand, if the voltage detection value is a voltage value (for example, 2 V) other than the USB power supply voltage (4.75 to 5.25 V), the connected external device is a device that does not have a USB host function. Is determined.

  When the type of the external interface held by the external device is determined in this way, the host CPU 1 executes switching control of the switch circuit 4 in step 3e based on the determination result. For example, since a personal computer PC having a USB host function is currently connected as an external device, the host CPU 1 switches the first changeover switch 41 to the USB device controller 21 side as shown in FIG. Then, the second changeover switch 42 is turned off, and the serial data interface 11 is set in a non-connected state with respect to the manufacturer option pin P8 and the reserved pin P9 of the system connector 5.

  Subsequently, the host CPU 1 proceeds to step 3 f to generate an ID request command here, and transmits this ID request command to the personal computer PC via the USB device controller 21. As shown in FIG. 3, the personal computer PC monitors the arrival of an ID request command in step 4b. When an ID request command arrives from the mobile communication terminal MS in this state, the personal computer PC indicates the type of its own device in step 4c. A device ID and a manufacturer ID are generated, and these device ID and manufacturer ID are transmitted to the mobile communication terminal MS.

  The host CPU 1 of the mobile communication terminal MS monitors the arrival of the ID in step 3g after transmitting the ID request command. When the device ID and manufacturer ID are received in this state, in step 3h, an external device database (not shown) is accessed based on these device ID and manufacturer ID, and the type of external device and its specification are determined. . Then, based on the determination result, it is determined in step 3i whether or not the external device is connectable to its own mobile communication terminal MS, and if it is determined that connection is possible, the system connector 5 and the terminal body Set the connection port between and to the enabled state.

  Thus, the portable communication terminal MS and the personal computer PC are connected via the USB interface, and thereafter, data transfer control by the upper protocol is possible between both devices.

(2) When connecting a memory card ES
It is assumed that the memory card ES is connected to the mobile communication terminal MS via a cable 9 corresponding to a system connector as shown in FIG. Then, in step 4a, the memory card ES uses a voltage generator 82 provided to generate an interface identification voltage, and the power supply that is set to a value different from the USB power supply voltage (4.75 to 5.25V) in advance. A voltage (3V) is generated.

  The interface identification voltage is supplied to the mobile communication terminal MS via the cable 9 and the USB power supply pin P4 (VBUS), and is input to the detection circuit 22 in the USB interface 2. When detecting the interface identification voltage input, the detection circuit 22 gives an interrupt signal to the host CPU 1.

  When the host CPU 1 of the mobile communication terminal MS detects the occurrence of an interrupt in step 3b, the host CPU 1 determines that an external device is connected to the system connector 5, and after inputting the voltage detection value from the detection circuit 22 in step 3c, Based on this voltage detection value, it is determined in step 3d whether the external device has a USB host function. Now, since the voltage value (2V) is other than the USB power supply voltage (4.75 to 5.25V), it is determined that the connected external device is a device that does not have a USB host function.

  When the type of the external interface held by the external device is determined in this way, the host CPU 1 executes switching control of the switch circuit 4 in step 3e based on the determination result. For example, since a memory card ES that does not have a USB host function is connected as an external device, the host CPU 1 switches the first changeover switch 41 to the serial control signal interface 3 side as shown in FIG. The second changeover switch 42 is turned on to connect the serial data interface 11 to the manufacturer option pin P8 and the reservation pin P9 of the system connector 5.

  Subsequently, the host CPU 1 proceeds to step 3f to generate an ID request command here, and transmits the ID request command to the memory card ES via the serial control signal interface 3. As shown in FIG. 3, the memory card ES monitors the arrival of the ID request command in step 4b. When the ID request command arrives from the mobile communication terminal MS in this state, the device indicating the type of its own device in step 4c. An ID and a manufacturer ID are generated, and these device ID and manufacturer ID are transmitted to the mobile communication terminal MS.

  The host CPU 1 of the mobile communication terminal MS monitors the arrival of the ID in step 3g after transmitting the ID request command. When the device ID and manufacturer ID are received in this state, in step 3h, an external device database (not shown) is accessed based on these device ID and manufacturer ID, and the type of external device and its specification are determined. . Then, based on the determination result, it is determined in step 3i whether or not the external device is connectable to its own mobile communication terminal MS, and if it is determined that connection is possible, the system connector 5 and the terminal body Set the connection port between and to the enabled state.

  Thus, the mobile communication terminal MS and the memory card ES are connected via the serial control signal interfaces 3 and 81 and the serial data interfaces 11 and 83, and thereafter, serial data transfer can be performed between both devices using a higher protocol. .

  On the other hand, if it is determined that the external device cannot be connected to the mobile communication terminal MS based on the determination result of the type of external device and its specification, the system connector 5 and the terminal body Set the connection port between and to the blocked state. Therefore, when an external device that does not conform to the specifications is connected to the mobile communication terminal MS, the connection of the external device is blocked, and as a result, adverse effects of the external device on the mobile communication terminal MS are prevented.

  As described above, in this embodiment, in the mobile communication terminal MS, in addition to the USB interface 2 having the USB device controller 21, the serial control signal interface 3 and the serial data interface 11 are provided, and these interfaces are selectively used. A switch circuit 4 connected to the system connector 5 is provided. When an external device is connected to the system connector 5, it is determined whether or not the external device has an external interface having a USB host function based on the interface identification voltage supplied from the external device. Based on the determination result, the switching circuit 4 is controlled to select an appropriate external interface.

  Therefore, when the connected external device is a personal computer PC having a USB host function, the USB interface 2 is selected and data transfer is performed using the USB interface, while the external device is a USB host. In the case of a slave device such as a memory card ES having no function, the serial control signal interface 3 and the serial data interface 11 are selected, and data transfer using a general-purpose serial interface is performed.

  That is, even if the portable communication terminal MS is not provided with a USB host function, data can be transferred by selectively connecting a plurality of types of external devices having different external interfaces, thereby reducing the portable communication terminal MS. Power consumption and low price can be maintained.

  In this embodiment, a USB interface and a serial interface are selectively connected to one serial connector 5. That is, one serial connector 5 is shared by the USB interface and the serial interface. Therefore, it is not necessary to newly provide a serial interface connector, and as a result, an increase in the size of the portable communication terminal can be prevented.

Further, in this embodiment, the authentication procedure is executed with the connected external device to determine the device type and manufacturer name of the external device, that is, the specification, and based on the determination result, the external device is set as its own terminal. It is determined whether it is a connectable device. When it is determined that the device cannot be connected, the external device is set to a non-connected state.
Therefore, even when an external device having a different specification is connected, a malfunction that causes the mobile communication terminal to malfunction or break down due to the external device can be prevented.

  This effect is particularly effective when, for example, a charger is connected as an external device. That is, if the rated value of the voltage / current of the connected charger is different from the standard value of the mobile communication terminal, it may cause heat generation or fire in some cases, which is extremely undesirable. Therefore, in this embodiment, when a charger as an external device is connected, the specification is determined based on the device ID and manufacturer ID of the charger acquired by the authentication procedure. As a result of the determination, the charger is When it is determined that the connection is impossible, the charging power input pins P5 and P6 and the power supply circuit in the portable communication terminal are disconnected to prevent charging. Therefore, even if chargers with different standards are connected, problems that cause heat generation or ignition are reliably prevented.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, a USB interface having a USB slave function and a general-purpose serial interface are provided, and these external interfaces are selected according to the type of external interface of the connected external device. . However, the present invention is not necessarily limited to this, and a plurality of other external interfaces such as RS232C, SPI, I2BUS, and IEEE1394 are provided, and these external interfaces are selected according to the type of external interface possessed by the external device. It may be configured.

In the embodiment, the case where the mobile communication terminal MS is provided with a USB interface having a USB slave function has been described as an example. However, for example, the portable communication terminal MS is more than a USB host function provided in an external device with high processing capability such as a personal computer. A USB simple host function configured to reduce processing addition may be provided in the mobile communication terminal MS.
In this way, data transfer using the USB interface can be performed with most external devices having only a USB slave function without significantly increasing the memory capacity of the mobile communication terminal MS and the processing capacity of the CPU. It becomes possible.

  Furthermore, in the embodiment, the type of the external interface included in the external device is determined based on the interface identification voltage generated by the external device. However, instead of the interface identification voltage, about 1 bit or 2 bits are used. The identification signal may be used to determine the type of the external interface by supplying the identification signal from an external device to a specific connector pin of the mobile communication terminal.

  In addition, the configurations and determination contents of the first and second determination units, the configuration of the interface selection unit, the configuration of the connection control unit, the types of external devices, the types of external interfaces, and the like are within the scope of the present invention. Various modifications can be made.

  In short, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The principal part block diagram which shows one Embodiment of the portable communication terminal concerning this invention. The figure which shows the name and function of each pin of the system connector provided in the portable communication terminal shown in FIG. The flowchart which shows the connection control procedure of the portable communication terminal shown in FIG. 1, and the external apparatus connected to this portable communication terminal, and its content. FIG. 2 is a diagram showing a connection configuration when a personal computer having a USB host function is connected as an external device to the mobile communication terminal shown in FIG. 1. The figure which shows the connection structure at the time of connecting the memory card which does not have a USB host function to the portable communication terminal shown in FIG. 1 as an external apparatus.

Explanation of symbols

  MS ... mobile communication terminal, PC ... personal computer, ES ... memory card, 1 ... host CPU of mobile communication terminal, 1a ... first determination means, 1b ... interface selection control means, 1c ... second determination means, 1d ... Connection control means, 2 ... USB interface, 3, 81 ... Serial control signal interface, 4 ... Switch circuit, 5 ... System connector, 6 ... Host CPU of personal computer, 7 ... USB cable, 8 ... Host CPU of memory card 11, 83 ... Serial data interface, 21 ... USB device controller, 22 ... Interface identification voltage detection circuit, 41 ... First changeover switch, 42 ... Second changeover switch, 61 ... USB host controller, 62 82 ... Voltage generator.

Claims (5)

A mobile communication terminal body;
An external connection connector having a predetermined terminal arrangement structure to which an external device is connected via a cable;
The mobile communication terminal body is
An external interface for exchanging signals with the external device via the cable and the connector for connection;
When it is detected that the external device is connected to the external connection connector, an authentication procedure is executed with the external device via the external interface, and the external Detection means for detecting the type and specification of the device;
Based on the detection result of the type and specification of the external device, determination means for determining whether the external device is a device that can be connected to the terminal or a device that cannot be connected,
When it is determined that the external device is a device connectable to the own terminal, the connection between the external connection connector and the mobile communication terminal main body is maintained, while the external device is connected to the own terminal. A portable communication terminal comprising: a connection control means for electrically disconnecting the connection between the external connection connector and the portable communication terminal main body when it is determined that the device cannot be connected; . The determination means includes
Means for receiving device identification information and manufacturer identification information indicating the type of the external device from the external device via the external interface when it is detected that the external device is connected to the external connection connector; ,
Based on the received device identification information and manufacturer identification information, means for accessing the external device database provided in advance to determine the type of the external device and its specifications;
And a means for determining whether the external device is a device connectable to the terminal or a device that cannot be connected based on a determination result of the type of the external device and its specification. The mobile communication terminal according to claim 1. When a charger is connected as the external device to the external connection connector having a signal transfer terminal connected to the first external interface and a power supply input terminal for charging,
The determination means receives device identification information and manufacturer identification information indicating the type of the charger via the signal transfer terminal of the external connection connector and the first external interface from the charger, and the received Based on the device identification information and manufacturer identification information, the external device database is accessed to determine the type of the charger and its specification, and the charger determines its own terminal based on the type of the charger and the determination result of the specification. To determine whether it is a connectable charger or a non-connectable charger,
When it is determined that the charger is a charger that cannot be connected to the terminal, the connection control means is provided in the power supply input terminal for charging of the external connection connector and the portable communication terminal main body. 3. The mobile communication terminal according to claim 2, wherein the power supply circuit is electrically disconnected from the power supply circuit. When the external device has at least one of a USB (Universal Serial Bus) host function and a serial data interface function,
The external connection connector includes a USB terminal and an additional terminal for a manufacturer,
The external interface has a USB slave function and transmits / receives a signal to / from an external device via the external connection connector and the external device via the external connection connector. A serial control signal interface for transferring serial control signals, and a serial data interface for transferring serial data to and from external devices via the external connection connector,
When it is detected that an external device that does not have the USB host function is connected to the external connection connector, the determination unit is configured to connect via the USB terminal of the external connection connector and a USB slave interface. The mobile communication terminal according to claim 2, wherein device identification information and manufacturer identification information representing a type of the external device are received from the external device. When the external device has at least one of a USB (Universal Serial Bus) host function and a serial data interface function,
The external connection connector includes a USB terminal and an additional terminal for a manufacturer,
The external interface has a USB slave function and transmits / receives a signal to / from an external device via the external connection connector and the external device via the external connection connector. A serial control signal interface for transferring serial control signals, and a serial data interface for transferring serial data to and from external devices via the external connection connector,
When it is detected that the external device that does not have the USB host function is connected to the external connection connector, the determination means is connected via the USB terminal of the external connection connector and a serial control signal interface. The mobile communication terminal according to claim 2, wherein device identification information and manufacturer identification information representing a type of the external device are received from the external device.

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