KR100994343B1 - A transmitting device and a method of serial signal for type mobile phone - Google Patents

Abstract

The present invention provides a serial signal transmission apparatus and method of a foldable portable terminal that can simplify peripheral circuits and increase signal reliability by transmitting data and control signals transmitted between a main control unit and at least one sub control unit as serial signals. to provide. To this end, the present invention includes elements for transmitting parallel data as serial data to the main control unit and other sub control units, respectively, converting the parallel data to be transmitted into serial data (or a signal), and transmitting the received serial data ( Or a signal) is converted into a parallel signal and output.

Description

Serial signal transmission device and method of mobile terminal {A TRANSMITTING DEVICE AND A METHOD OF SERIAL SIGNAL FOR TYPE MOBILE PHONE}

1 is a diagram showing the appearance of a general folding portable terminal;

2 is a configuration diagram of an FPCB function of a body part and a folder part according to the prior art;

3 is a detailed line circuit diagram of a conventional FPCB;

4 is a functional configuration diagram of a serial signal transmission apparatus of a portable terminal according to an embodiment of the present invention;

5 is a functional block diagram of a serial signal transmission apparatus of a portable terminal according to another embodiment of the present invention;

6 is a flow chart of a serial signal transmission method of a portable terminal according to the present invention;

7 is a configuration diagram of a serial transmission format according to the present invention.

** Explanation of symbols on the main parts of the drawing **

100: body 110: main controller 120,240: serial

130,250: format 140,210: separation 150,220: parallel

200: folder portion 230: sub-control unit 300: FPCB

310: downlink 320: uplink 330: audio bus

340: power line 400: LCD part 500: camera part

The present invention relates to an apparatus and method for transmitting a serial signal of a portable terminal capable of transmitting and receiving data and control signals transmitted as a serial signal between a main control unit and at least one sub-control unit in a portable terminal.

The mobile communication system is a mobile terminal (UE: USER EQUIPMENT) to provide a service to communicate by wireless access to the other party immediately while moving the service area, when carrying the mobile terminal, anytime, anywhere wirelessly connected with the other party The prevalence is spreading by the advantage of being able to communicate.

The portable terminal should be easy to carry and at the same time, the function is increased by the development of technology, the development of light weight and small size in the state of maintaining the communication function is continuing.

One of reducing the size of the portable terminal is a folding type portable terminal. The folding type includes a main body provided with communication and control functions, and a folder part distributed with a display unit and simple functions. Between the main body and the folder portion, a circuit for transmitting the data and the signal is provided.

Hereinafter, a body portion and a folder portion signal transmission method of a conventional folding type portable terminal will be described with reference to the accompanying drawings.

To illustrate the prior art, FIG. 1 is an external configuration state diagram of a general folding portable terminal, FIG. 2 is an FPCB functional configuration diagram of a body portion and a folder portion according to the prior art, and FIG. It is a detailed track schematic.

Referring to FIG. 1, a general foldable portable terminal is provided with a main controller to process various communication signals, control signals, and data signals, input voice level signals, transmit and receive high frequency wireless signals, and operate operating power by a rechargeable battery. A body portion 10 for supplying; It is rotated and connected to the body portion 10 is provided with a corresponding data, a control signal, an audio signal, a power supply, and a folder portion 20 for displaying a variety of information on the display unit and outputs an audio signal.

Referring to FIG. 2, the FPCBs of the body part 10 and the folder part 20 according to the related art are generated by the body part 10 to transmit signals to be displayed on the display part of the folder part 20. A 16 bit data bus 30; A control bus 40 generated by the main control part of the body part 10 and transmitting a control signal for controlling the function of the folder part 20; An audio bus 50 for transmitting an audio signal between the body portion 10 and the folder portion 20; It consists of a power line 60 for supplying the operating power from the body portion 10 to the folder portion 20, wherein each circuit is configured in FPCB (FLEXIBLE PRINTED CIRCUIT BOARD).

Referring to FIG. 3, a filter 70 is added to the data bus signal line and the control bus signal line of the FPCB to prevent noise caused by external electromagnetic interference.

Hereinafter, the signal transmission apparatus of the folder unit of the portable terminal will be described in detail by the prior art having the above configuration.

The main body 10 of the mobile terminal (UE) is provided with a main control unit to monitor and control each function unit, input a voice level signal and a dialing signal, process the baseband signal, and transmit wirelessly with a high frequency signal and at the same time receive wirelessly. The converted signal is converted into a baseband signal and output, and the operating power is supplied from the charge / discharge battery.

The folder part 20 is connected to the body part 10 through an FPCB, and the FPCB is, for example, a data bus 30 for transmitting a data signal, a control bus 40 for transmitting a control signal, and audio. An audio bus 50 for transmitting signals, a power supply line 60 for supplying power, and the like.

For example, the data bus 30 is transmitted from the main control part of the body part 10 to the sub-control part of the folder part 20 and output to the LCD display part. BIT), which consists of 16 parallel transmission lines.

In addition, the control bus 40 is transmitted from the main control portion of the body portion 10 to the sub-control portion of the folder 20, a signal for controlling the vibrator (VI / BR / vibrator) on / off (ON / OFF) Transmitting / receiving a signal to control the backlight of the LCD display unit ON / OFF, a signal controlling the RGB color of the LCD display unit, and various circuits and data controlling the LCD display unit Device selection signal, a control signal for initializing the LCD display unit, a timing signal for transmitting and recording control data to the LCD display control circuit, a control signal for adjusting the brightness of the LCD display unit backlight, and a manufacturer of the LCD display unit. It transmits a control signal for distinguishing and a control signal for designating an address signal of the LCD display unit, and includes about 10 transmission lines. It is a parallel transmission method that transmits a corresponding signal.

In addition, the audio bus 50 is for transmitting an audio signal, and the power line 60 is for supplying the operating power of the folder unit 20.

The data bus 30 and the control bus 40 of the above-described configuration, in order to block the noise inflow by electromagnetic wave (EMI) induction, as shown in FIG. It is a complicated structure to be provided.

Therefore, in the parallel transmission scheme of the prior art, the number of lines is 16 lines for transmitting 16-bit data, 10 lines for transmitting control signals, two lines for transmitting audio signals, power supply At least 30 lines, such as two lines, are required for supplying the circuit, and the transmission line becomes more when other functions such as image capturing are added, so that the design of the flexible PCB (FPCB) is complicated and interference occurs between each signal line. The reliability of the transmitted signal is lowered.

In addition, when a function is added to the portable terminal and the number of signals to be transmitted between the body portion 10 and the folder portion 20, such as photographing an image signal, there is a problem that the design of the FPCB becomes more complicated.

In addition, since the width of the FPCB is wide, the occurrence rate of contact failure of the line is high due to the skew phenomenon such as torsion, it takes a lot of time for manufacturing and production, and the signal of the adjacent line is easily introduced into the noise, There is a problem that the reliability is lowered.

In addition, when the signal to be transmitted between the body portion 10 and the folder portion 20 is increased, it is difficult to standardize the interface (INTERFACE) because the FPCB must be newly designed.

It is an object of the present invention to provide a signal transmission apparatus and method for a portable terminal capable of transmitting and receiving data and control signals transmitted in a serial signal between a main control unit and at least one sub control unit in a portable terminal.

In order to achieve the above object, the present invention includes a body unit for converting and outputting data and control signals of a mobile terminal into a serial signal and converting and inputting data and control signals applied as a serial signal into a parallel signal; A folder unit converting and inputting data and control signals applied as serial signals from the body unit into parallel signals, and converting data and control signals to be transmitted to the body unit into serial signals and outputting the serial signals; It is connected to the body portion and the folder portion is characterized in that the configuration consisting of a flexible PCB (FPCB) for transmitting and receiving data and control signals in series and transmitting audio signals and power.

In addition, the present invention has been made in order to achieve the above object, the control process for determining whether to transmit or receive data and control signals; In the case of transmitting the data and the control signal in the determination process, converting the parallel data and the control signal into a serial signal, and converting into a serial transmission format and transmitting; In the case of receiving the data and the control signal in the determination process, receiving and synchronizing the signal of the serial transmission format, characterized in that consisting of the process of separating the serial data and the control signal and converting in parallel.

Hereinafter, an apparatus and method for transmitting a serial signal of a portable terminal according to the present invention will be described with reference to the accompanying drawings. In the present invention, for the sake of convenience, the folding type portable terminal is described as an example, but the present invention is applied to flip, slide, and other types of mobile phones without being converted.

4 is a configuration diagram of a serial signal transmission apparatus of a clamshell portable terminal according to an embodiment of the present invention, and FIG. 5 is a configuration of a serial signal transmission apparatus according to another embodiment of the present invention. It is also. 6 is a flowchart showing a serial signal transmission method of a clamshell portable terminal according to the present invention, and FIG. 7 is a block diagram of a serial transmission format according to the present invention.

Referring to FIG. 4, the serial signal transmission apparatus of the clamshell portable terminal according to an embodiment of the present invention includes a body part 100, a folder part 200, and between the body part 100 and the folder part 200. And a flexible PCB (FPCB) connected to and transmitting serial data.
The body unit 100 converts and outputs data and control signals of the portable terminal into a serial signal, and converts and inputs data and control signals applied as a serial signal into parallel signals, simultaneously controlling and monitoring each functional unit of the portable terminal. A main control unit 110 for outputting and inputting data DATA and a control signal CONTROL SIGNAL in parallel; A serial unit 120 for converting data and control signals applied in parallel from the main control unit 110 into a serial signal; A format unit 130 for converting data and control signals applied from the serial unit 120 into a serial transmission format (FORMAT); A separation unit 140 which analyzes a signal input from an external serial transmission format and separates the signal into data and a control signal; The parallel unit 150 converts the serial data and the control signal applied from the separation unit 140 into a parallel signal and applies the parallel control unit 150 to the main control unit 110.
The folder unit 200 converts and inputs data and control signals applied as a serial signal from the body unit 100 into parallel signals, and data and control signals to be transmitted to the body unit are converted into serial signals to the body unit. An output unit for separating and detecting a signal applied to the serial transmission format from the body unit 100 into data and a control signal; A parallel unit 220 for converting the serial data and the serial control signal applied from the separation unit 210 into parallel data and the parallel control signal; Input and analyze parallel data and parallel control signals applied from the parallel unit 220 to operate, control and monitor the folder unit 200 and output data and control signals to be reported to the body unit 100 as parallel signals. A sub-control unit 230; A serial unit 240 for converting parallel data applied from the sub-control unit 230 and a control signal into a serial signal; The format unit 250 converts a serial signal applied from the serial unit 240 into a serial transmission format.
The flexible PCB (FPCB) is connected to the body part 100 and the folder part 200, transmits and receives data and control signals in series, and transmits audio signals and power. Two downlink lines 310 for transmitting the output signal; Two uplink lines 320 for transmitting signals output from the folder unit 200 in a serial transmission format; An audio bus 330 transmitting audio signals of the body part 100 and the folder part 200; It consists of a power line 340 for transmitting the operating power of the body portion 100 and the folder portion 200.

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In addition, as shown in FIG. 5, the folder unit 200 converts data and control signals applied from the body unit 100 in a serial transmission format into parallel signals and analyzes and displays them in a corresponding sub-control unit. 400; It may be configured to include a camera unit 500 for photographing the surrounding image signal, and analyzed by the sub-control unit to transmit the serial transmission format signal to the body portion 100.

Hereinafter, a serial signal transmission apparatus of a portable terminal according to the present invention having the above configuration will be described in detail. In the present invention, a folding portable terminal will be described as an example.

The body part 100 and the folder part 200 constituting the portable terminal are electrically connected by the FPCB 300 to transmit the data and the control signal in a serial format, and to transmit the audio signal and the operating power.

Since the main controller 110 controls and monitors the body unit 100 and controls and monitors the entire portable terminal in parallel in order to speed up all signal analysis and processing, all data and control signals input and output are , Input and output as parallel signal.

Therefore, the parallel data and the control signal output from the main control unit 110 are converted into a serial signal by the serial unit 120, applied to the format unit 130, and converted into a serial transmission format. The signal converted into the serial transmission format in units of frames by the 130 is applied to the folder unit 200 through the downlink transmission line 310 including the transmission line (two bits) configured for the FPCB 300.

The serial transmission format is performed in units of frames. The serial transmission format is used to match the synchronization of the frames, and a start flag for initially configuring a preamble (PREAMBLE) in which a synchronization clock is recorded and indicating the start of a frame in which a signal to be transmitted is recorded. (START FLAG) is configured, the control signal consisting of 16 bits, the length field indicating the length of the word unit of data, the data field to be transmitted, the CRC to check the error of the frame unit signal, the end indicating the end of the frame unit signal It consists of a flag.

The length field indicates a data size transmitted in the serial transmission format frame because the amount or size of data constituting the data field may vary.

The folder unit 200 received through the downlink 310 of the FPCB 300 receives the serial signal by the serial transmission format having the frame structure as described above from the separating unit 210, and the separating unit 210 The serial transmission format is analyzed and synchronized to be input. The serial control signal and data are separated and detected, and output to the parallel unit 220.

The parallel unit 220 converts input serial data and control signals into parallel signals and applies them to the sub-control unit 230, and the sub-control unit 230 performs corresponding analysis and processing, for example, an LCD (LCD). : Control display such as operation information display, character information display, and image signal display by multi-pixel information on the display unit consisting of liquid crystal display, and at the same time detect the data necessary for operation and the serial unit together with the corresponding control signal. Output to 240.                     

The serial part 240 and the format part 250 of the folder part 200 function in the same function as the serial part 120 and the format part 130 of the body part 100, and the body part 100. Since the separation unit 140 and the parallel unit 150 of the same function and the same function as the separation unit 210 and the parallel unit 220 of the folder unit 200, a detailed description thereof will be omitted.

When the data and the control signal transmitted to the FPCB 300 is transmitted in a balanced manner, the interference between the signals is reduced and the electromagnetic waves are blocked. When the low voltage transmission method and the waveform shaping method are applied, the electromagnetic waves are blocked. You do not need to use a filter.

Therefore, two downlink lines for transmitting the serial transmission format in units of frames from the body portion 100 to the folder portion 200 and two for transmitting the serial transmission format from the folder portion 200 to the body portion 100. It is sufficient to have about eight lines, such as two uplink lines, two lines for transmitting an audio signal, and two lines for supplying power, and as an option, the body part 100 and a folder part ( In the case where the serial synchronization clock signal is separately transmitted between 200, the corresponding transmission line is further required, and the serial transmission format does not require a preamble configured for the synchronization clock signal.

In addition, even if the signal transmitted by the addition of the function between the body portion 100 and the folder unit 200 increases, for example, even in the case of photographing and transmitting the image signal, the serialization (MULTIPLEXING) to transmit The data size included in the data field of the transmission format may be increased, and the length field may be adjusted as much as the size of the data increases in units of words as described above, thereby making it easy to add a function.                     

In addition, since the signal transmission line between the body portion 100 and the folder portion 200 is fixed to a certain number, there is an advantage such as reducing the cost and shortening the production time by standardizing the interface.

Hereinafter, with reference to the accompanying Figure 6, by the present invention, a serial signal transmission method of a mobile terminal will be described.

First, the control unit determines whether to transmit or receive data and a control signal. For example, the main control unit 110 constituting the body unit 100 and the sub-control unit 230 constituting the folder unit 200 are connected to the data. It may be determined whether to transmit or receive a control signal, respectively (S100). In this case, the control operation by the main control unit will be described as an example.

In the case where it is determined that the data and the control signal are transmitted in the determination process (S100), the control unit 110, 230 converts the parallel data and the control signal into a serial signal and converts the data into a serial transmission format. The parallel data and the control signal applied from each of the two by the serial unit (120,240) is converted into a serial (SERIAL) signal (S110), the data signal and the control signal converted into a serial signal in the process (S110) Each format unit 130 and 250 converts each frame into a serial transmission format FORMAT, and outputs the same through the flexible cable 300 (S120).

On the other hand, if it is determined that the data and the control signal is received in the determination process (S100), receiving and synchronizing the signal of the serial transmission format, separate detection of the serial data and the control signal, and converts and input in parallel Detect each synchronization signal from the signal applied in the serial transmission format through the flexible cable 300, and synchronize the respective synchronization signals (S130), and synchronize the serial unit in the frame unit After separating and detecting the serial data and the serial control signal from the transmission format signal in the separating unit (210, 140), respectively (S140); The serial data and the control signal detected in the process (S140) are converted into parallel (PARALLEL) signals by the parallel units 150 and 220, respectively, and input to the corresponding controllers 110 and 230, respectively (S150).

In addition, referring to FIG. 7, the serial transmission format (FORMAT) in units of frames includes: a preamble including a synchronization clock signal for synchronization matching of the serial transmission signal; A start flag (START FLAG) indicating a frame start of the serial transmission format; The control signal to be transmitted is included, and the 3-bit address field designates the control mode, the MAIN LCD display unit, the SUB LCD display unit and the camera address according to the 3-bit combination, and the remaining addresses are reserved. A control field comprising a 10-bit control command field for allocating a control command to each bit, and a 3-bit data field mode for indicating a bit size in word units by a combination of 3 bits; A length field LENGTH indicating a word unit size of the data field; A data field including the pixel PIXEL position data displayed on the display unit; CRC for checking a data error of the serial transmission frame unit; It consists of an end flag (END FLAG) indicating the end of the frame of the serial transmission format.

Hereinafter, the present invention having the configuration described above will be described in more detail with reference to the accompanying drawings.

The main control unit 110 constituting the body portion 100 of the portable terminal and the sub-control unit 230 constituting the folder 200 determine whether to transmit or receive data and control signals, respectively (S100). In the case of transmission by the determination, the parallel data and the parallel control signal are output, and the parallel data and the control signal respectively outputted are applied to the serial units 120 and 240 and converted into serial signals (S110).

Each data and control signal converted into a serial signal as described above is applied to the respective format unit (130, 250) and converted into a frame-by-frame serial transmission format of the configuration as shown in FIG. Transmitted through the corresponding line of 300).

In the determination process (S100), when it is determined that the main control unit 110 of the body unit 100 and the sub-control unit 230 of the folder unit 200 receive data and control signals, respectively, the corresponding separation unit ( Since 140 and 210 detect the preamble from the serial transmission format signal received through the FPCB 300, the synchronization signal is detected and synchronization is synchronized (S130).

The synchronization signal detection is synchronized with the serial synchronization clock signal when the serial synchronization clock signal is separately transmitted between the body part 100 and the folder unit 200 by an option.

When the synchronization is matched as described above, the separation unit 140, 210 separates and detects the serial data and the control signal (S140), and the detected serial data and the control signal are the parallel unit 150. , And each of the parallel units 150 and 220 converts the input serial signal into a parallel signal and applies it to each of the corresponding main controller 110 and the sub-control unit 230 (S150).

When the folder unit 200 is composed of an LCD unit 400 displaying text and an image and a camera unit 500 capturing an image, the folder unit 200 includes a sub-control unit 230, and functions as described above. Process and perform respectively.

Therefore, the present invention having the above-described configuration converts the parallel data and the control signal generated in the body portion 100 and the folder portion 200 into a serial transmission format and transmits the data to a few transmission lines, thus providing a transmission line. The configuration of the FPCB 300 is simplified. As a result, even if the type of the transmitted signal increases due to the addition of a function, the transmission line is not increased, and since the existing FPCB 300 can be used as it is, the interface can be standardized and a false contact occurrence rate due to torsion Has the advantage of reducing

According to the present invention having the above-described configuration, since the signals transmitted and received between the body portion and the folder portion of the clamshell portable terminal are serially transmitted, the number of the lines for transmitting the signals is reduced, and the convenience of use of the FPCB can be easily configured. have.

In addition, even if the function is added, it is possible to transmit the added signal while maintaining the number of transmission lines, and there is an industrial use effect of reducing the manufacturing cost by standardizing the interface.

In addition, it reduces the interference and electromagnetic wave inflow between the signal transmission line and at the same time reduces the occurrence of false contact due to torsion, thereby improving the productivity and reducing the incidence of defects.

Claims (13)

A body unit for multiplexing data and control signals and converting the data and control signals into serial signals; A folder unit converting the serial signal transmitted from the body unit into a parallel signal and outputting data and control signals; A serial signal transmission apparatus of a portable terminal including a flexible PCB (FPCB) for transmitting a signal transmitted between the body portion and the folder portion, The body portion, A main controller which controls and monitors each functional unit of the portable terminal and simultaneously outputs and inputs data and control signals; A first serial unit converting the data and the control signal applied from the main controller into a serial signal; A first format unit converting data and control signals applied from the first serial unit into a serial transmission format and transmitting the converted data to the folder unit; A first separation unit for analyzing the transmitted signal converted into a serial signal in the folder unit and separating the data into a control signal; A first parallel unit converting the serial data and the control signal separated by the first separator into a parallel signal and applying the same to the main controller; The folder unit, A second separation unit for analyzing a signal applied from the body unit in a serial transmission format and separating the signal into data and control signals; A second parallel unit converting the data and the control signal separated by the second separator into a parallel signal; A sub-control unit which analyzes data and control signals applied from the second parallel unit to operate, control and monitor the folder unit and output data and control signals to be reported to the body unit; A second serial unit which multiplexes the data and the control signal output from the sub-control unit and converts the data into a serial signal; And a second format unit for converting the serial signal applied from the second serial unit into a serial transmission format and transmitting the serial signal to the body unit. delete delete The method of claim 1, wherein the FPCB, A downlink for transmitting the serial signal output from the first format unit; An uplink for transmitting a serial signal output from the second format unit; An audio bus transmitting audio signals of the body portion and the folder portion; And a power line for transmitting the operating power of the body portion and the folder portion. delete The method of claim 4, wherein the FPCB is And a line for transmitting the serial synchronous clock signal when a separate serial synchronous clock signal is transmitted between the body and the folder by an option. A serial signal transmission method of a portable terminal comprising a body portion, a folder portion and one flexible PCB (FPCB) for transmitting a signal transmitted between the body portion and the folder portion, Serial signal transmission method of the portable terminal, Determining whether the body unit transmits data and control signals to the folder unit or receives from the folder unit; In the case of transmitting the data and the control signal in the judging step, converting the parallel data and the control signal into a serial transmission format and transmitting to the folder unit through the flexible PCB; When receiving the data and the control signal from the folder through the flexible PCB in the determining step, the step of detecting the serial data and the control signal from the signal of the serial transmission format received and converting in parallel to receive and, The transmitting process, The main control unit of the body unit controls and monitors each functional unit of the portable terminal and simultaneously outputs data and control signals in parallel; Converting the data and the control signal applied from the main control part into a serial signal by the first serial part of the body part; Converting, by the first format unit of the body unit, data and control signals applied from the first serial unit into a serial transmission format and transmitting the converted data to the folder unit; Analyzing a signal transmitted from the first format unit by a second separating unit of the folder unit, detecting a synchronization signal to synchronize synchronization, and separating the data into a control signal; Converting the data and control signals separated by the second separating unit into parallel signals by a second parallel unit of the folder unit; A sub-control unit of the folder unit analyzes data and control signals applied from the second parallel unit to operate, control and monitor the folder unit, The receiving process, Outputting data and control signals to be reported to the body by the sub-control unit; Converting, by the second serial unit, the folder unit into a serial signal by multiplexing data and control signals outputted from the sub-control unit; Converting, by the second format unit of the folder unit, a serial signal applied from the second serial unit to a serial transmission format and transmitting the serial signal to the body unit; Analyzing a signal transmitted from the second format unit by a first separating unit of the body unit, detecting a synchronizing signal to match synchronization, and separating the data into a control signal; And converting the serial data and the control signal separated by the first separator into a parallel signal and applying the same to the main controller by the first parallel part of the body part. The method of claim 7, wherein the determining process, And determining whether the main controller and the sub-controller transmit or receive data and control signals, respectively. delete delete The method of claim 7, wherein the serial transmission format, A preamble including a synchronous clock signal for synchronous matching of the serial transmission signal; A start flag indicating a start of a frame of the serial transmission format; A control field including a transmitted control signal; A length field indicating a word unit size of the data field; A data field including pixel position data displayed on the display unit; CRC for checking a data error in the frame unit of the serial transmission format; And an end flag indicating an end of a frame of the serial transmission format. 12. The method of claim 11, The control field is composed of a 3-bit address field, a 10-bit control command field, and a 3-bit data field mode. The address field designates the control mode, the main LCD display unit, the sub LCD display unit, and the address of the camera by a 3-bit combination, and the remaining addresses are reserved. The 10-bit control command field assigns a control command to each bit, The data field mode is a serial signal transmission method of a portable terminal, characterized in that for indicating the bit size in units of words by a combination of three bits. 8. The method of claim 7, The process of synchronizing the synchronization with the second separator and separating the data and the control signal, or the process of synchronizing the synchronization with the first separation and separating the data and the control signal, And when a serial synchronous clock signal is applied between the body portion and the folder portion, the serial signal transmission method of the portable terminal, characterized in that the synchronization signal is not detected from the serial transmission format.

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