KR0147595B1 - Personal information terminal with wireless calling function - Google Patents

Abstract

The present invention relates to a device for interfacing a wireless pager having a wireless unit, a decoder, and a ROM with a personal information terminal having an input device, a liquid crystal display device, and a system processor, wherein the decoder matches the address of the received data with a unique address. And generates an address detection signal, outputs received data according to the received clock, and synchronizes with the system processor according to a system valid signal. The system processor generates an interrupt according to the address detected signal and inputs received data according to the received clock. If an inappropriate data is input, the transfer stop signal is generated to stop the transfer, and the reset signal is generated to reset the decoder.

Description

Interface device between radio pager and personal digital assistant and method thereof

1 is a block diagram showing a connection between a conventional pager and a personal digital assistant,

2 is a block diagram showing a personal information terminal having a calling function according to the present invention,

3 is a flowchart illustrating a communication process between a pager unit and a system unit according to the present invention.

* Explanation of symbols for main parts of the drawings

30: personal information terminal having a calling function

40: pager part 42: radio part

44: decoder section 46: ROM (EEPROM)

50: system unit 52: input device

54 system processor 56 liquid crystal display (LCD)

The present invention relates to an interface device between a pager and a personal digital assistant (PDA) and a method of interfacing between a pager and a personal information terminal.

Personal Digital Assistant (PDA) is a portable personal handheld device with personal information management and communication functions, and is emerging as a necessity of the information society. This is a product that combines the communication function with the current personal computer (PC), it is possible to use a conventional keyboard or pen input method as an input device, and a liquid crystal display (LCD) is generally used as a display device. In addition, the communication function that can be used can receive services such as FAX / DATA modem, cellular phone, pager, e-mail, PC communication using telephone line, and voice recognition using digital signal processing (DSP). . Such PDA products include Apple Computer's Newton, and IBM and Casio have developed a new type of PDA that emphasizes communication.

Components of such PDA products include real-time operating system, graphic user interface (GUI) technology, personal information management application software, text recognition algorithm, power management, modem, pager, and cellular technology centered on central processing unit and core chip. This is necessary. As described above, when a wireless information apparatus such as a pager is connected to a conventional personal information terminal (PDA), each system is connected using an interface such as RS-232C.

1 is a block diagram showing an example of connecting a wireless pager and an information terminal in a conventional manner.

In FIG. 1, a pager 10 includes an antenna, a radio section 11, a cordrom 12, a POCSAG decoder 13, a pager CPU 14, and an RS-232C line driver / receiver 15. In FIG. It is provided. The personal information terminal (PDA) 20 also includes an RS-232C line driver / receiver 21, a system CPU 23, an input device 24, and an LCD display device 22. In order to interconnect the wireless pager 10 and the personal information terminal 20, the wireless pager 10 requires a central processing unit 14 and an RS-232C line driver receiver 15, and also the PDA 20. RS-232C line driver receiver 21 is required, there is a problem that the circuit configuration is complicated. In addition, there is a restriction that a protocol such as X-MODEM must be used in software for communication between systems.

Accordingly, an object of the present invention is to provide an interface device between a pager and a personal information terminal in order to solve the above problems. The apparatus is to interface between a personal data terminal having a radio pager having a radio section 42 for receiving a radio call signal and a display device 56 displaying information received at the radio section 42. A device (44) for decoding and outputting a signal received by the radio section (42); And a system processor 54 for processing a signal output from the decoder 44 and displaying the same on the display device 56, wherein the decoder 44 is a master and the system processor 54 is a slave. By using a serial peripheral interface (SPI) method is characterized in that the communication port of the decoder 44 and the communication port of the system processor 54 is directly connected.

Another object of the present invention is to provide an interface method between a pager and a personal information terminal in order to solve the above problems. The method includes an interface method between a pager and a personal information terminal having a system processor for controlling the entire system, the method comprising: a first step of generating an interrupt to the system processor when a pager message is received; A second step of determining whether the personal information terminal is in a sleep mode; A third step of operating the terminal if the terminal is in the sleep mode in the second step, and setting a pager timeout value if the terminal is not in the sleep mode; Setting a pager type out value and reducing the pager timeout value set according to a timer interrupt; And a fifth step of resetting the pager timeout value according to the serial peripheral interface interrupt and transmitting the received pager data to the system processor until the pager timeout value set in the fourth step becomes a predetermined value. Characterized in that it comprises a.

Next, the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing a personal information terminal having a radio calling function according to the present invention.

As described above, personal digital assistant (PDA) products are based on a core chip such as a central processing unit, such as a real-time operating system, graphical user interface (GUI) technology, personal information management software, character recognition algorithm, modem, pager, There is a need for a communication technology such as cellular. PDA 30 having a wireless call function according to the present invention uses a central processing unit and ASIC integrated peripheral functions to minimize the number of chips in the system.

The wireless call service is a one-way communication, and provides various services. In particular, the transition from numeric service to alpha-numeric message service is gradually increasing, and the transmission speed is increasing from 512bps, 1200bps to 2400bps or more. By combining these pagers and PDAs, you can create electronic notebooks, phone books, spreadsheets, address books, etc., where time appointments are checked. The wireless caller 40 used in the PDA having a wireless call function according to the present invention is a wireless pager using the POCSAG signaling method, and the transmission character is English as ASCII code, and the Korean language is KSC 5601 2. Byte completion type.

In addition, the PDA having a wireless call function 30 according to the present invention removes the CPU of the pager part from the RS232C interface of the related art and shares the CPU of the PDA so that the number of parts used can be reduced and the power can be reduced in size. . To this end, the POCSAG decoder 44 is used as a master, and the communication of the system processor 54 is performed by directly connecting the synchronous communication port of the POCSAG decoder 44 to the communication port of the system processor 54. It uses the Serial Peripheral Interface (SPI) method with the port as a slave. In the system software, the X-MODEM protocol is used simply by handling the communication port.

2, a pager 40 which receives and demodulates a radio call signal and receives information DATA, and a system 50 which interfaces with the pager 40 and provides various information to the user. . The pager 40 includes a radio unit 42 for receiving and demodulating and digitalizing a radio call signal through an antenna, a decoder for decoding the output of the radio unit 42 and decoding and interfacing the call unit with the system unit 50 ( 44, and a ROM 46 (EEPROM in the embodiment of the present invention) for storing data. The system unit 50 includes an input device 52 that accepts key input, a liquid crystal (LCD) display device 56 for displaying information, and a system processor 54 for performing various software and interfacing with the pager unit 40. ).

The B / S, O / CG, and DATA ports of the radio unit 42 are connected to the BS1, BS2, and DATA IN ports of the decoder unit 44, respectively, and the ROM CLK, ROM DATA, ROM RST, ROM of the decoder 44 are connected. The CE port is connected to the EEPROM 46, respectively. In addition, the address detection signal ADDR_DET of the decoder 44 is connected to the IRQ2 and PC7 ports of the system processor 54, and from the high state to the low state when the received address signal matches the CAP code stored in the EEPROM 46. Transition. It also remains low while data is being received, and then returns to a high state after reception is complete. The RX CLK, RX DATA, SYS VALID, EOT and RST ports of the decoder 44 are connected to the SCK, RX DATA, OUT OF RANGE, EOT and RST ports of the system processor 54, respectively. In this case, the RX CLK refers to a synchronous clock required for the received data, the RX DATA is a data line in the 8-bit unit received, the SYS VALID is a POCSAG type code from the radio section 42 to the POCSAG decoder 44 When is received, the transition from the low state to the high state, the EOT is used when forcibly blocking data received from the system, the RST resets the phaser unit 40 at the initial power-up. The BS controls the battery status with the Battery Low Indication Input. If the decoder 44 detects four consecutive 'high' inputs, the battery 44 is in a 'low' state. DATA IN is the port to which serial data is input. The address detection signal ADDR_DET checks whether the address of the input data is the same as its own address, and outputs a signal to the system processor 54 when it is the same. RX CLK represents the clock of the receiver, and a system valid signal (SYS VALID) synchronizes an external signal with the receiver of the pager. End of Transmission (EOT) forcibly completes data transmission when inappropriate data is input. The reset signal RST initializes the decoder 44 as a reset port. ROM CLK, ROM DATA, ROM RST, and ROM CE indicate clock, data, reset, and chip enable of EEPROM 46, respectively.

3 is a flowchart illustrating a communication process between a pager unit and a system unit according to the present invention.

If a pager message is received in step S1, an interrupt IRQ2 is requested to the system processor 54 in step S2. The system processor 54 determines whether the system is in the sleep mode in step S3 when the interrupt IRQ2 is applied, and wakes up the system in step S4 when YES. If NO in step S3, the pager timeout value is set in step S5. In step S6 it is determined whether the timer interrupt (Timer Interrupt), if yes, in step S7 to reduce the pager timeout (Timeout Value). If NO in step S6, it is determined in step S8 whether a serial peripheral interface (SPI) is interrupted. If YES, in step S9, a pager timeout value is set, and in step S10, pager data is set. Move to the system unit 50. If NO in step S8, it is determined whether the pager timeout value is '0' in step S11, and if it is YES, in step S12, the message is terminated by outputting a message end signal; in case of No, S6 Proceed to step and repeat steps S6 ~ S11.

As described above, the PDA having the wireless call function according to the present invention has an effect of implementing low power consumption and miniaturization with a simple circuit configuration. In addition, communication software can be simply implemented to improve reliability.

Claims (2)

A device for interfacing between a radio pager having a radio section 42 for receiving a radio call signal and a personal information terminal having a display unit 56 for displaying information received from the radio section 42. A decoder (44) for decoding and outputting the signal received by the radio section (42); And a system processor 54 for processing a signal output from the decoder 44 and displaying the same on the display device 56, wherein the decoder 44 is a master and the system processor 54 is a slave. And a communication port of the decoder (44) and a communication port of the system processor (54) are directly connected by using a serial peripheral device interface (SPI) scheme. An interface method between a pager and a personal information terminal having a system processor for controlling a system, comprising: a first step of generating an interrupt to a system processor when a pager message is received; A second step of determining whether the personal information terminal is in a sleep mode; A third step of operating the terminal if the terminal is in the sleep mode in the second step, and setting a pager timeout value if the terminal is not in the sleep mode; Setting a pager timeout value and reducing the pager timeout value set according to a timer interrupt; And a fifth step of resetting the pager timeout value according to the serial peripheral interface interrupt and transmitting the received pager data to the system processor until the pager timeout value set in the fourth step becomes a predetermined value. Interface method between the wireless pager and the personal information terminal comprising a.