JP2008193232A - Function-expandable wireless communication module and mobile communication terminal - Google Patents

Abstract

A wireless communication module capable of extending functions by inserting an external medium having a specific function and a mobile communication terminal using such a wireless communication module are provided.
A wireless communication module operates as a mobile communication terminal together with a main unit, and is connected to a main unit control unit via a first interface connectable to the main unit interface and a predetermined data signal line of the first interface. The module control unit that transmits and receives data signals in the device, the audio signal that transmits and receives data signals to and from the module control unit, and that is encoded with the audio encoding / decoding unit of the main device via the first interface A slot having a wireless communication circuit for transmitting and receiving, an antenna, and a second interface for connecting an external medium. A data signal transmission / reception method via the data signal line is selected from a plurality of methods according to a control signal on a predetermined signal line of the interface.
[Selection] Figure 3

Description

  The present invention relates to a wireless communication module and a mobile communication terminal, and more particularly, a wireless communication module capable of extending functions by inserting an external medium having a specific function, such as an external storage medium, and such a wireless communication module. The present invention relates to a mobile communication terminal using the.

  Mobile communication terminals having a telephone function, an e-mail function, and the like such as a PHS (Personal Handyphone System) terminal and a mobile phone terminal are widely used in the world.

  In the conventional mobile communication terminal, each component of the terminal is integrally incorporated in one casing. That is, all terminals have to be equipped with wireless communication elements such as an antenna, a transmission / reception unit, a modulation / demodulation unit, and an audio transcoder. The development of components related to such wireless communication has been a factor in increasing the development cost and extending the development period of terminal manufacturers. In addition, it was necessary to perform a performance test of the mobile communication terminal for each developed device. In addition, while having development technology for various software for terminals, it is difficult for manufacturers who do not have radio communication technology to develop their own mobile communication terminals.

  Further, when the same user uses a plurality of mobile communication terminals, each terminal needs to have a unique telephone number. Therefore, for a user who owns a plurality of terminals, the management of these terminals becomes complicated. Such a problem makes it difficult to freely use many mobile communication terminals having various forms and functions.

  In addition, the life cycle of mobile communication terminals (schedule from the release of a certain model to the release of a new model) is fast, and a new model is frequently purchased regardless of a failure or the like. When the user purchases a new model terminal and renews the contract, the user cannot use the terminal that has been used. Furthermore, when changing the model of a mobile communication terminal, the work of deleting the telephone number from the terminal used so far and re-registering the telephone number in a new terminal has occurred.

  Furthermore, there is a need to perform voice communication like a conventional mobile phone in connection between a PHS communication terminal dedicated for data communication and a personal digital assistant (PDA).

  In order to solve these problems, the applicant has made a wireless communication module in which a wireless communication element incorporated in a conventional mobile communication terminal is made independent as a separate small module, and a terminal (hereinafter referred to as a wireless communication module) corresponding to the wireless communication module. Have already been proposed (for example, see Japanese Patent Application No. 2005-303392).

  An example of the configuration of such a mobile communication terminal 1 is shown in FIG. The mobile communication terminal 1 operates as a PHS communication terminal. The mobile communication terminal 1 includes a radio communication module 100 in which radio communication elements incorporated in a conventional PHS communication terminal are made independent as separate small modules, and a jacket (main body device) having an interface corresponding to the radio communication module 100. 200. By inserting the wireless communication module 100 into a slot provided in the jacket 200 and connecting it to the interface, both function as the mobile communication terminal 1 as a whole. The radio communication module 100 includes an antenna 102, an antenna switch 104, a transmission unit 106 and a reception unit 108, a modulation unit 110 and a demodulation unit 112, a TDMA (time division multiple access) encoding unit 114, a TDMA decoding unit 116, an ADPCM transformer. It comprises an audio transcoder 118 such as a coder, a module control unit 120, a ROM 122, a RAM 124, a power supply 126, and an interface unit 128. The antenna 102 is preferably a shortened antenna such as a dielectric chip antenna. A radio communication circuit of the radio communication module 100 including the antenna switch 104, the transmission unit 106 and the reception unit 108, the modulation unit 110 and the demodulation unit 112, the TDMA encoding unit 114, and the TDMA decoding unit 116 is a normal PHS communication terminal. It is a part related to wireless communication. As described above, the wireless communication module 100 includes various components related to wireless communication, and is a versatile multifunction communication module that can store data such as a telephone directory in the ROM 122, for example.

The jacket 200 includes a voice encoding / decoding unit such as a PCM codec 202, a voice input / output unit such as a microphone 204 and a speaker 206, a data input / output unit such as a jacket control unit 208, a keypad 210 and a display 212, a power source 214, and the like. An interface unit 216 is included.

  The operation of the mobile communication terminal 1 when performing communication by connecting the wireless communication module 100 to the jacket 200 is as follows.

  The user's voice is input to the PCM codec 202 via the microphone 204 and subjected to pulse code modulation. The interface unit 216 of the jacket 200 and the interface unit 128 of the wireless communication module 100 have 18 pins (signal lines). An example of the pin arrangement is shown in FIG. Specifically, as a UART (Universal Asynchronous Receiver Transmitter) serial interface, TXD (transmission serial data), RXD (reception serial data), RTS (transmission data ready) are used to transmit and receive control data and data during data communication. ), CTS (transmission ready), DTR (reception ready), DCD (data carrier detection), and RI (ring indicator). For the transmission / reception of each signal for audio, four pins of PCM clock signal (PCMCLK), PCM synchronization signal (PCMSYNC), PCM input signal (PCMIN) and PCM output signal (PCMOUT) are used. The INS (detection signal) pin is used for recognizing the insertion of the wireless communication module 100, and two pins, a power supply (Vcc) and a ground (GND), are used for supplying power to the wireless communication module and for grounding. The Pins for each signal (DISP1, DISP2, DISP3) for electric field strength are prepared and used to display electric field strength (antenna display) on an external display device such as a jacket LCD and LED. Further, the interface notification signal (IF_SEL) is used when the pin currently used for data transmission / reception of the UART system can be used for data transmission / reception of another data transfer system other than the UART system. It is used to confirm whether this is another method. The voice data encoded by the PCM codec 202 is input to the ADPCM transcoder 118 in the wireless communication module 100 via one of the four pins for voice, and converted into ADPCM-modulated data. . The output signal of the ADPCM transcoder 118 is code-converted into a time division multiple access (TDMA) baseband signal (114), and further converted into a modulated wave of, for example, 1.9 GHz by the modulator 110 and the transmitter 106. Wirelessly transmitted to the base station via the switch 104 and the antenna 102.

  On the other hand, the data input from the input device such as the keypad 210 of the jacket 200 by the user is input to the jacket control unit 208, and further via the UART serial interface pins (TXD, RXD) of the interface 216 and interface 128. Input to the module control unit 120. The data signal is input to the TDMA encoding unit 114 and thereafter wirelessly transmitted to the base station via the modulation unit 110, the transmission unit 106, the antenna switch 104, and the antenna 102 in the same manner as the audio signal.

  A signal received by the antenna 102 is input to the receiving unit 108 by the antenna switch 104. This received signal (for example, 1.9 GHz band) is amplified and frequency-converted by the receiving unit 108, then demodulated into a TDMA baseband signal by the demodulating unit 112, and then decoded by the TDMA decoding unit 116. The audio signal output from the TDMA decoding unit 116 is input to the audio transcoder 118 and converted into a PCM audio signal. The PCM audio signal is further input to the PCM codec 202 on the jacket 200 side via the audio signal pins of the interface units 128 and 218, converted into an analog signal, and output via the speaker 206. On the other hand, the data signal output from the TDMA decoding unit 116 is input to the module control unit 120, input to the jacket control unit 208 via the UART serial interface pins of the interface units 128 and 218, and the keypad 210. In response to a request from the user that is transmitted to the jacket control unit 208 through the display 212, the display is displayed via the display 212.

  The ROM 122 built in the wireless communication module 100 stores data such as telephone numbers, PINs (Personal Identify Numbers), PUKs (Personal Unblock Keys), etc., and data such as a telephone directory. The RAM 124 stores control data, Used to temporarily hold data to be transmitted and received.

  By utilizing such a compact module, manufacturers developing communication devices are freed from the burden of developing components related to wireless communication. These manufacturers can concentrate on the development of software and the like, can shorten the development period, and can concentrate on enhancing the functionality of the terminal (jacket). Also, companies without wireless communication technology can develop their own terminals (jackets). Moreover, not only conventional terminals but also home appliances, furniture, cars, stuffed animals, etc. that have necessary components and have slots corresponding to the wireless communication module of the present invention can be used as mobile communication terminals. It becomes.

  Furthermore, even if you have multiple jackets, you can obtain the same effect as changing the model of a conventional mobile communication terminal by replacing and using such a wireless communication module, and you do not have specialized knowledge The model can be changed easily. Conventionally, terminals that can no longer be used due to model changes have been discarded as unnecessary products. However, by using the wireless communication module as described above as a standard product, such disposal is unnecessary and environmentally friendly. Can be a product.

  Although the mobile communication terminal 1 shown in FIG. 1 has various useful effects as described above, the function of the wireless communication module 100 cannot be freely expanded due to its configuration. For example, when the user desires to increase the memory capacity of the wireless communication module 100 to store more phonebook data, image data, or moving image data, the user can perform wireless communication with a built-in memory having a larger storage capacity. A new module must be purchased and used by inserting it into the jacket 200 in place of the currently used wireless communication module. Therefore, the burden on the user side increases.

  In addition, in order to meet such user demand, wireless communication module manufacturers need to develop modules with various storage capacities and add them to the product lineup. Therefore, the burden on the manufacturer increases.

  Furthermore, if the user of the mobile communication terminal 1 that does not have a wireless LAN function or a GPS (global positioning system) function desires to use these functions, a new wireless communication module incorporating the functions must be purchased. I must. Therefore, the burden on the user side increases.

  The wireless communication module of the present invention is inserted into the main unit and operates as a mobile communication terminal together with the main unit. The main unit includes a main unit control unit, a speech encoding / decoding unit, and a main unit. A main unit interface connected to the control unit and the speech encoding / decoding unit. The wireless communication module includes a first interface connectable to the main unit interface, a module control unit that transmits and receives a data signal to and from the main unit control unit via a predetermined data signal line of the first interface, and a module A wireless communication circuit that transmits / receives a data signal to / from the control unit and transmits / receives an encoded audio signal to / from the audio encoding / decoding unit of the main device via the first interface; An antenna connected to the communication circuit and a slot having a second interface for connecting an external medium connected to the module control unit. The main unit control unit and the module control unit select from a plurality of methods for transmitting and receiving data signals via the predetermined data signal line according to control signals on the predetermined signal lines of the main unit interface and the first interface. To do.

  The external medium may be selected from the group consisting of an external recording medium, an external medium having a wireless LAN function, and an external medium having a GPS function.

  The recording medium includes a memory stick micro (trademark), a micro SD (trademark) memory card, a memory stick micro with a conversion adapter to a micro SD memory card, and a micro SD memory card with a conversion adapter to a memory stick micro. There may be at least one. As the plurality of systems, a USB system and a UART system can be adopted.

  The mobile communication terminal of the present invention includes a main body device and a wireless communication module that is inserted into the main body device and transmits and receives signals to and from the main body device. The main device includes a main device control unit, a speech encoding / decoding unit, and a first interface connected to the main device control unit and the speech encoding / decoding unit. On the other hand, the wireless communication module transmits / receives a data signal between the second interface connected to the first interface and the main device controller via the predetermined data signal lines of the first and second interfaces. Radio that transmits and receives data signals between the module control unit and the module control unit, and transmits and receives encoded audio signals to and from the audio encoding / decoding unit via the first and second interfaces A communication circuit, an antenna connected to the wireless communication circuit, and a slot having a third interface for connecting an external medium connected to the module control unit. The main device control unit and the module control unit select from a plurality of methods for transmitting and receiving data signals via the predetermined data signal line according to control signals on the predetermined signal lines of the first and second interfaces. .

  The external medium may be selected from the group consisting of an external recording medium, an external medium having a wireless LAN function, and an external medium having a GPS function.

  The recording medium may be at least one of a memory stick micro, a micro SD memory card, a memory stick micro equipped with a conversion adapter to a micro SD memory card, and a micro SD memory card equipped with a conversion adapter to a memory stick micro. Good. Further, the USB method and the UART method can be adopted as the plurality of methods.

  According to the present invention, the storage capacity of the wireless communication module can be expanded by newly purchasing only a recording medium having a desired storage capacity and inserting it into the slot of the wireless communication module without having to replace the wireless communication module itself. it can. Therefore, the burden on the user is reduced. Also, manufacturers of wireless communication modules are freed from the burden of adding modules with various storage capacities to the product lineup. In addition, by connecting an external medium having a wireless LAN function, a GPS function, or the like to the wireless communication module, the function of the module can be easily expanded. Therefore, it is not necessary to purchase a module having those functions. Therefore, the burden on the user is reduced.

  Hereinafter, a preferred embodiment of the present invention will be described, but the scope of the present invention is not limited thereto.

  An example of an external perspective view of the wireless communication module 300 of the present invention is shown in FIG. The wireless communication module 300 of FIG. 3 has a slot 302 into which a Memory Stick micro 400, which is one of small external recording media, is inserted. The slot 302 includes an interface having specifications conforming to the Memory Stick Micro 400 standard. In order to clearly indicate that the wireless communication module 300 has a slot 302, FIG. 3 is drawn with the upper side of the case of the wireless communication module 300 transparent.

  There is a micro SD memory card as a small recording medium equivalent to the Memory Stick Micro. As described above, the slot 302 of the wireless communication module 300 of the present invention shown in FIG. 3 includes an interface conforming to the Memory Stick micro standard. A conversion adapter for converting a micro SD memory card to a memory stick micro has already been proposed and put into practical use. Therefore, as shown in FIG. 4, the micro SD memory card 500 can be used by inserting the micro SD memory 700 in which the conversion adapter 600 is mounted into the slot 302.

  Similarly, a configuration in which a memory stick micro equipped with a conversion adapter for micro SD is inserted and used in the wireless communication module of the present invention having an interface conforming to the micro SD standard is also possible.

  A plan view (A1), a bottom view (A2), a front view (A3), and a side view (A4) of the wireless communication module 300 are shown in FIG. An example of the dimensions of the wireless communication module 300 is shown in the figure, and it has a compact configuration with a length of 42 mm, a width of 25.6 mm, and a thickness of 4 mm. In order to facilitate the insertion and removal of the Memory Stick micro, it is preferable that the insertion opening of the slot 302 is configured to be recessed from the side surface of the wireless communication module 300 as shown in FIGS. Further, FIG. 5B shows a state where the micro SD memory 700 with the conversion adapter 600 attached is inserted into the slot 302 and the wireless communication module 300 is inserted into the slot 218 of the jacket 200.

  A method of taking out the recording medium inserted in the slot 302 of the wireless communication module 300 is shown in FIG. A1 to A3 in FIG. 6 show a method of taking out the memory stick micro 400, and B1 to B3 show a method of taking out the micro SD memory 700. The micro SD memory 700 is inserted with the conversion adapter 600 shown in FIG. 5 attached (700). As a preferred configuration of the present invention, in the embodiment shown in FIG. 6, a push-push type insertion / extraction mechanism is employed. In addition, it is possible to employ an insertion / extraction mechanism known to those skilled in the art.

  In A1 and B1 in FIG. 6, the outer side surface of the memory SD micro 400 locked in the slot 302 or the micro SD memory 700 with the conversion adapter attached is, for example, 0. 0 from the side surface of the wireless communication module 300. It is at an inner position of about 5 mm (A1, B1). When taking out these recording media, the user pushes the side surface of the recording medium in the direction of the inside of the slot and pushes it from the side surface of the wireless communication module 300 to an overstroke position of about 1.5 mm (A2, B2). When the user releases his / her hand from the recording medium in this state, the recording medium jumps from the side surface of the wireless communication module 300 to a position of about 3.5 mm (A3, B3). With such a mechanism, the user can easily take out the recording medium.

  An example of the internal configuration when the wireless communication module 300 of the present invention is inserted into the jacket 200 is shown in FIG. In the wireless communication module 300, a slot including the interface unit 330 is provided in the conventional wireless communication module 100, and an external storage medium 322 is inserted into this slot.

  Since the signal flow when performing voice communication and data communication with other terminals and base stations using the wireless communication module 300 and the jacket 200 is the same as in the conventional configuration of FIG. Is omitted.

On the other hand, in the wireless communication module 300 of the present invention, unique information such as the telephone number, PIN, and PUK of the wireless communication module 300 and data such as a phone book are stored in the recording medium 322 such as the memory stick micro 400 or the micro SD memory card 500. Stored. In response to a data write request or data read request from the user via the display 212 or the keypad 210 of the jacket 200, the jacket control unit 208 sends a signal corresponding to the request to the interface unit 216 of the jacket 200 and the wireless communication. The data is transmitted to the module control unit 320 via the data transmission / reception pins (TXD, RXD) of the interface unit 328 of the communication module 300. In response to the signal, the module control unit 320 writes data to the storage medium 322 or reads data from the storage medium 322 via the interface unit 330. Data read from the storage medium 322 is transmitted from the module control unit 320 to the jacket control unit 208 via the interface units 328 and 216, and displayed on the display 212 as necessary.
In addition, although specific information, such as a telephone number, PIN, and PUK, and a telephone directory etc. were recorded on recording media 322, such as Memory Stick micro400 and micro SD memory card 500, such information was recorded on ROM325, Another information such as image data may be recorded on the recording medium 322, and the contents recorded in the ROM 325 and the recording medium 322 may be separated according to the usage of the mobile communication terminal.

  When data is exchanged between the conventional wireless communication module 100 and the jacket 200, pins for the UART serial interface have been used. In addition, data communication between the mobile communication terminal 1 and other terminals or base stations, and data transmission / reception between the wireless communication module 100 and the jacket 200 (for example, data writing to the ROM 122 or data transfer from the ROM 122) Reading) could not be performed simultaneously. When performing data communication with another terminal or base station using the UART serial interface pin, the data transmitted and received in the data communication is transmitted between the wireless communication module 100 and the jacket 200 for the UART serial interface pin. Had to use. For this reason, it is necessary to stop data writing to the ROM 122, data reading from the ROM 122, and the like.

  On the other hand, the wireless communication module 300 of the present invention can perform data transmission / reception with the jacket 200 by the USB method. As a result, not only data that is written to or read from the recording medium 322 (memory stick micro 400 or micro SD memory card 500), but also mobile communication that is a combination of the wireless communication module of the present invention and the jacket 200. Data transmitted and received by the terminal 2 in data communication with an external terminal or the like can be simultaneously transmitted and received using the same pins of the interface unit 328 of the wireless communication module 300 and the interface unit 216 of the jacket 200.

  The pin arrangement of the wireless communication module 300 of the present invention is shown in FIG. The pin arrangement may be the same as the conventional pin arrangement shown in FIG. In this case, the interface unit 328 has 18 pins. Of these, the IF_SEL pin is used for exchanging signals instructing whether the two pins TXD and RXD for data transmission / reception are used as UART serial interface pins or USB interface pins. .

  There may be various modes for specifying the interface for which the TXD pin and the RXD pin are used. For example, when data transmission / reception in the USB method is set to the jacket control unit 208 by default and the user presses a predetermined key on the keypad 210 or selects a predetermined instruction from a menu displayed on the display 212 Only the TXD pin and the RXD pin may be used as a UART serial interface. In the default state, the jacket control unit 208 holds the voltage of the IF_SEL pin at a low level (LOW), for example. In response to the LOW state of the IF_SEL pin, the jacket control unit 208 and the module control unit 320 perform data transmission / reception via the TXD pin and the RXD pin by the UART method. On the other hand, when the use of the TXD pin and the RXD pin as the USB interface is selected, the jacket control unit 208 sets the voltage of the IF_SEL pin to a high level (HIGH). In response to the HIGH state, the jacket control unit 208 and the module control unit 320 perform data transmission / reception via the TXD pin and the RXD pin by the USB method.

  When data is transmitted / received in the USB system, a plurality of types of data can be transmitted / received simultaneously due to the characteristics of the system. Accordingly, data can be written to the storage medium 322 and data can be read from the storage medium 322 simultaneously while performing data communication with other terminals using the mobile communication terminal 2.

As described above, in the present specification, the configuration in which the wireless communication module 300 of the present invention includes the interface for the external storage medium has been illustrated as an example. However, the scope of the present invention is not limited to this. For example, it is possible to easily extend the functions of the wireless communication module by providing the wireless communication module with an interface compliant with the standard of an external medium having a wireless LAN function or a GPS function and connecting the external medium to the interface. It becomes possible. For example, when a micro SD card or a memory stick micro standard external recording medium having a wireless LAN function or a GPS function is developed in the future, general-purpose products that comply with these new external media as well as memory cards. By providing a common interface in the wireless communication module, the function of the wireless communication module can be easily expanded. As an example, FIG. 9 shows a configuration when a corresponding wireless LAN card is connected to the wireless communication module 300 of the present invention via an interface 330.
FIG. 9 includes a wireless LAN card 323 instead of the storage medium 322 of the wireless communication module 300 shown in FIG. Since the other configuration is the same as that of FIG. 7, detailed description thereof is omitted.

It is a figure which shows the structural example of the conventional mobile communication terminal which the applicant has already proposed. It is a figure which shows an example of pin arrangement | positioning of the mobile communication terminal of FIG. It is an external appearance perspective view of one Example of the wireless communication module of this invention. It is a figure which shows that both a Memory Stick micro and a micro SD memory card can be applied to the wireless communication module of the present invention by the conversion adapter. FIG. 4 is a plan view, a bottom view, a front view, a side view, and a state in which the module is inserted into a slot of a jacket for the wireless communication module of the present invention. It is a figure which shows the taking-out method of the recording medium inserted in the slot of the radio | wireless communication module of this invention. It is a figure which shows an example of an internal structure at the time of inserting the radio | wireless communication module of this invention in a jacket. It is a figure which shows an example of pin arrangement | positioning of the mobile communication terminal of this invention. It is a figure which shows a structure at the time of connecting the corresponding wireless LAN card to the wireless communication module of this invention.

Claims (8)

In a wireless communication module that is inserted into a main unit and operates as a mobile communication terminal together with the main unit, the main unit includes a main unit control unit, a voice encoding / decoding unit, the main unit control unit, and the voice code. A main unit interface connected to the encoding / decoding unit, and the wireless communication module includes:
A first interface connectable to the main unit interface;
A module control unit that transmits and receives data signals to and from the main unit control unit via a predetermined data signal line of the first interface;
Wireless transmission / reception of data signals to / from the module control unit and transmission / reception of encoded audio signals to / from the audio encoding / decoding unit of the main unit via the first interface A communication circuit;
An antenna connected to the wireless communication circuit;
A slot having a second interface for connecting an external medium connected to the module control unit, wherein the main unit control unit and the module control unit have predetermined main unit interface and first interface predetermined A wireless communication module, wherein a transmission / reception method of a data signal through the predetermined data signal line is selected from a plurality of methods according to a control signal on the signal line.   The wireless communication module according to claim 1, wherein the external medium is selected from the group consisting of an external recording medium, an external medium having a wireless LAN function, and an external medium having a GPS function.   The recording medium is at least one of a memory stick micro, a micro SD memory card, a memory stick micro with a conversion adapter to a micro SD memory card, and a micro SD memory card with a conversion adapter to a memory stick micro. Item 3. The wireless communication module according to Item 2.   The wireless communication module according to claim 1, wherein the plurality of systems include a USB system and a UART system. In a mobile communication terminal comprising a main unit and a wireless communication module that is inserted into the main unit and transmits and receives signals to and from the main unit,
The main device comprises a main device control unit, a speech encoding / decoding unit, and a first interface connected to the main device control unit and the speech encoding / decoding unit,
The wireless communication module transmits a data signal between a second interface connected to the first interface and the main body controller via a predetermined data signal line of the first and second interfaces. Audio that is transmitted and received between the module control unit and the module control unit, and that is encoded between the audio encoding / decoding unit via the first and second interfaces A wireless communication circuit for transmitting and receiving signals; an antenna connected to the wireless communication circuit; and a slot having a third interface for connecting an external medium connected to the module control unit;
The main body device control unit and the module control unit have a plurality of methods for transmitting and receiving data signals via the predetermined data signal lines in accordance with control signals on the predetermined signal lines of the first and second interfaces. A mobile communication terminal characterized by being selected from.   The mobile communication terminal according to claim 5, wherein the external medium is selected from the group consisting of an external recording medium, an external medium having a wireless LAN function, and an external medium having a GPS function.   The recording medium is at least one of a memory stick micro, a micro SD memory card, a memory stick micro with a conversion adapter to a micro SD memory card, and a micro SD memory card with a conversion adapter to a memory stick micro. Item 3. The mobile communication terminal according to Item 2.   The mobile communication terminal according to claim 1, wherein the plurality of systems include a USB system and a UART system.