KR20000056767A - Uart with an ic card reading interface and ic card reading system using the same - Google Patents

Abstract

The Universal Asynchronous Receiver / Transmitter (UART) with the IC card readout interface of the present invention includes a universal asynchronous communication core, a multiplexer, and a three-state control input / output buffer. The general purpose asynchronous communication core performs asynchronous serial communication. The multiplexer and three-state control input / output buffer enable serial output signal and serial input signal pins with other functions during IC card read mode and general purpose asynchronous transmit / receive mode. The IC card reading system includes a computer system having an IC card reader having an IC socket and a smart card interface and a UART having an IC card reading interface. A UART with an IC card reader interface may be electrically connected to the smart card interface of the IC card reader, thereby eliminating the microcontroller and the transmitter / receiver in the IC card reader.

Description

Universal Asynchronous Transceiver with IC Card Reading Interface and IC Card Reading System Using The Same

The present invention relates to a universal asynchronous receiver-transmitter (UART) and a smart IC card reading system, and more particularly, to a UART having an IC card reading interface and an IC card reading system using the same. .

Recently, plastic money such as bank cards, including credit cards, is popular. As is well known, conventional plastic cards, called magnetic cards, cannot store large amounts of data and have security issues. As semiconductor technology has advanced dramatically, integrated circuits (ICs) have become smaller and smaller. For this reason, IC cards have been developed by the integration of plastic cards and ICs, and have completely replaced conventional magnetic cards. Because IC cards can store very large amounts of data, they are more secure, less susceptible to damage, and not only bank card functions, but also identification cards and health insurance cards. Have Therefore, IC card has been widely applied to our daily life and has become a new culture.

In general, IC cards may be classified into memory cards, microprocessor cards, and contactless cards. Currently, a card reader communicates with the UART of a central computer, such as an 8-bit microcontroller, via an RS-232C communication interface to read memory cards and microprocessor cards. 1 shows a conventional IC card reading system. Referring to Fig. 1, an IC card reader 12 reads data from an IC card according to the ISO7816 specification. Thereafter, the read data is transmitted to the personal computer 10 in accordance with the RS-232C communication standard, and processed by its driver.

The conventional IC card reader 12 includes an IC card socket 19, a smart card interface 18, a microcontroller 17, and a transmitter / receiver 16. Once the IC card is inserted into the IC card socket 19, the firmware included in the microcontroller 17 is ISO7816 to access the IC card according to the instructions from the personal computer 10. The smart card interface 18 is controlled to provide an input / output signal in accordance with the standard. In general, data read out from the IC card through the microcontroller 17 is converted into an RS-232C standard signal by the transmitter / receiver 16, and the RS-232C standard signal is transmitted / received by the personal computer 10. It is transmitted to the UART 14 of the personal computer 10 through the receiver 15.

The IC card reader 12 requires three or more integrated circuits. That is, a microcontroller in the form of firmware, a transmitter / receiver for converting to a communication interface standard, and a smart card interface for converting to an IC card standard. As is well known, according to the ISO7816 standard, an access serial data format includes one start bit, eight data bits, one parity bit, and at least one guard. Contains a guardtime bit. In addition, one of the data formats may consist of UART 14, that is, one start bit, eight data bits, one parity bit, and one stop bit to be received and processed. As described above, data is converted into two specifications of similar serial data formats in each of the IC card reader 12 and the UART 14 of the personal computer. This consumes many energy sources and materials and requires high manufacturing costs.

In view of the foregoing, it is an object of the present invention to provide a UART having an IC card reading interface and an IC card reading system using the same.

1 is a block diagram showing a conventional IC card reading system;

2 is a block diagram showing an IC card reading system according to a preferred embodiment of the present invention;

3 is a schematic illustration of the connection of the IC card reading system shown in FIG. 2;

4 is a block diagram showing a UART with an IC card reader in accordance with a preferred embodiment of the present invention; And

5 is a block diagram showing in detail a UART having an IC card reader according to a preferred embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: personal computer 12, 22: IC card reader

14: UART 15, 16, 25: Transmitter / Receiver

17: microcontroller 18, 28: smart card interface

19, 30: IC card socket 20: computer system

24: UART with IC card interface

40: general purpose asynchronous communication core 42: 3-state control input / output buffer

44: multiplexer 50: multiplexer

52: inverter 54: inverted and gate

56: three-state inverter 58: pull-up resistor

60: buffer

According to a feature of the invention for achieving the object of the invention as described above, a UART having an IC card reading interface has at least one serial output signal and a serial input signal. The UART with the IC card read interface includes a general purpose asynchronous communication core, a multiplexer and a three-state control input / output buffer. The general purpose asynchronous communication core transmits and receives asynchronous serial signals including an internal serial output signal, an internal serial input signal, and a transmission clock output signal.

Furthermore, the multiplexer has an output terminal connected to a serial output signal, a one input terminal connected to the transmission clock output signal, a type force terminal connected to the internal serial output signal, and a selection terminal connected to a mode selection signal. When the mode select signal indicates the IC card read mode, the transmit clock output signal activates the serial output signal. When the mode select signal indicates a general purpose asynchronous transmit / receive mode, the internal serial output signal activates the serial output signal. The tri-state control input / output buffer is coupled with the internal serial output signal, internal serial input signal, mode select signal, and serial input signal, the serial input signal being used to activate the internal serial input signal. When the internal serial output signal is at the low level, if the mode selection signal indicates the IC card read mode, the serial input signal is at the low level. In the IC card read mode, when the internal serial output signal is high level and the serial input signal is activated by an external signal, the serial input signal becomes equal to the external signal. Also, if the internal serial output signal is at a high level and the serial input signal is not activated by the external signal, the serial input signal is at a high level.

In addition, an IC card reading system using a UART having an IC card reading interface of the present invention is a computer system having an IC card reader having an IC card socket and a smart card interface, and a UART having an IC card reading interface. It includes. The IC card socket is provided for connecting an IC card. The smart card interface is electrically connected to the IC card socket and provides input / output signals necessary for accessing the IC card. The UART with IC card read interface is electrically coupled to control the smart card interface to access the inserted IC card. Moreover, the UART is optionally connected with a transmitter / receiver to provide asynchronous communication functionality to a computer system.

By using the UART with the IC card reading interface of the present invention, the computer system can be directly connected to the smart card interface in the IC card reader, and it is not necessary to have a microcontroller and a transmitter / receiver in the IC card reader. Therefore, production costs and consumption of energy sources and materials are significantly reduced. Moreover, the computer system can be selectively connected to the transmitter / receiver and can provide asynchronous communication functions to the computer system for flexible applications.

According to another feature of the present invention for achieving the object of the present invention, a UART having an IC card reader includes a general purpose asynchronous communication core, a multiplexer, an inverter, an inverted end gate, a three-state inverter, and a pull-up resistor. The general purpose asynchronous communication core may communicate asynchronous serial signals including an internal serial output signal, an internal serial input signal, and a transmission clock output signal. The multiplexer includes a one input terminal connected to the transmission clock output signal, a type force terminal connected to the internal serial output signal, and a selection terminal connected to a mode selection signal. When the mode select signal is at a high level, the transmit clock output signal activates the output of the multiplexer. When the mode select signal is at the low level, the internal serial output signal activates the output of the multiplexer. The inverter has an input terminal connected with an internal serial output signal. The inverted and gate has a one input terminal connected to an output of the inverter and a type force terminal connected to a type force terminal of the mode selection signal. The three-state inverter has an input connected to the output of the inverter and a control terminal connected to the output of the inverted and gate. The internal serial input signal is output from the three-state inverter. The pull-up resistor has one end connected to the output of the three-state inverter and the other end connected to a power supply voltage.

The UART having an IC card read interface has an output terminal connected with the internal serial input signal and an input terminal connected with the output terminal of the three-state inverter. The general purpose asynchronous communication core includes a modem control register for providing a mode selection signal.

The UART according to the present invention can directly control the smart card interface and can significantly reduce the manufacturing cost and the consumption of energy sources and materials of the entire IC card reading system. As a result, the application of the UART is more flexible.

(Example)

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 2 to 5.

In the following description, specific details are set forth in detail with reference to the drawings in order to provide a more thorough understanding of the present invention. However, it will be understood that the scope of the invention is not limited to the disclosed embodiments.

2 is a block diagram showing an IC card reading system according to a preferred embodiment of the present invention.

The IC card reading system of the present invention shown in FIG. 1 includes an IC card reader 22 and an UART having an IC card socket 30 and a smart card interface 28. A computer system 20 having 24. The UART 24 is designed to be integrated into one IC with an IC card read interface (not shown). A UART 24 with an IC card reading interface is located in the computer system 20 so that it can be directly connected with the smart card interface 2 in the IC card reader 22. Compared with the conventional IC card reader, the two ICs, the microcontroller and the transmitter / receiver in the IC card reader 22 are unnecessary, so that manufacturing cost, energy source and material consumption are significantly reduced.

The IC card socket 30 is designed according to the ISO standard and is electrically connected with the IC card. The smart card interface 28 is used to detect whether an IC card has been inserted / removed into / from the IC card socket 30, provides necessary reset clock signals, and supplies power to the inserted IC card. Input / output signals required to access the inserted IC card are provided by the smart card interface 28.

In addition, the UART 24 having an IC card reading interface in the computer system 20 controls the smart card interface 28 and writes or inserts data into the inserted IC card. Directly connected with the smart card interface 28 to read data from the IC card. Moreover, the UART 24 performs all functions of general UART processing as it is, and uses a multiplexer, a jumper, etc. to provide an asynchronous communication function such as RS-232C to the computer system 20. And may optionally be connected to (25). As mentioned above, the application field of the UART of the present invention is further expanded.

Unlike conventional IC card reading systems, firmware for controlling the inserted IC card is located in the microcontroller of the IC card reader, and the IC card reading system of the present invention is the smart card for accessing the inserted IC card. In order to directly control the card interface 28, no microcontroller with a device driver or BIOS to drive the UART 24 is used.

3 is a view schematically showing the connection of the IC card reading system shown in FIG.

Referring to FIG. 3, a UART 24 with an IC card readout interface still provides a general universal communication function, and allows the smart card interface 28 and the transmitter / receiver (to be electrically connected with the IC card reader 22). 25) The pin is set to connect one of the UART (24). In this example, the difference in pin settings for a typical UART and IC card readout interface is shown in Table 1.

TABLE 1

Common UART IC card readout interface * DTR (Data Terminal ready) PWRON (Power On) * Request Transmission (RTS) Reset * DSR (Data Setting Ready) C4 (Reserved) * CTS (Clean Transmission) N.A. * CD (Carrier Detection) C8 (Reserved) Receive Indication (RI) CRDDET (Card Detection) SOUT (Serial Output) Synchronous Clock (STNCLK) SIN (Serial Input) IO (Data Input / Output)

One pin is configured as the serial data output pin in a typical UART, while the IC clock read interface is configured as the synchronous clock output pin. The other pin is set as the serial data input pin in a typical UART, while the data input / output pin is set as the IC card read interface. In this embodiment, the 9-pin connector typically uses an RS-232C communication interface. As is well known in the art, the pins set in Table 1 can be classified into different groups according to their input / output. Within the same group the pin settings can be exchanged identically to the driver.

4 is a block diagram showing a UART with an IC card reader according to a preferred embodiment of the present invention. Referring to FIG. 4, a UART having an IC card reading interface can be applied to the IC card reading system shown in FIG. Most input / output signals set and detect input / output signals except the serial output signal SOUT and the serial input signal SIN. As is well known in the art, a driver may be used with its own driving and detection as it is set differently for other applications, but will not be described here. Only the two signal pin states described above, which can perform different functions in different application modes, are described here.

The UART with an IC card read interface includes a Universal Asynchronous Communication Core 40, a multiplexer 44 and a tri-state input / output buffer 42. The general purpose asynchronous communication core 40 performs an asynchronous communication function originally owned by a general UART, and includes an internal serial output signal SOUTI, an internal serial output signal SINI, and a transmission clock output signal * BAUDOUT. Has all the signals needed for asynchronous serial communication, including Moreover, the general purpose asynchronous communication core 40 provides a mode select signal MSEL for the UART of the present invention having an IC card read interface to set the general purpose asynchronous transmit / receive mode or the IC card read mode.

The multiplexer 44 has an output terminal for transmitting the serial output signal SOUT, a one input terminal for receiving the transmission clock output signal * BAUDOUT, and another terminal for receiving an internal serial output signal SOUTI. It has an input terminal and a selection terminal for receiving a mode selection signal MSEL. When the mode selection signal MSEL indicates the IC card read mode, the multiplexer 44 selects the transmission clock output signal * BAUDOUT as the serial output signal SOUT. When the mode select signal MSEL indicates a general purpose asynchronous transmit / receive mode, the multiplexer 44 selects the internal serial output signal SOUTI as the serial output signal SOUT. In other words, one of the transmission clock output signal * BAUDOUT and the internal serial output signal SOUTI is selected as the output signal of the multiplexer 44 according to two application modes.

The three-state control input / output buffer 42 is connected to an internal serial output signal SOUTI, an internal input signal SINI, a mode select signal MSEL, and a serial input signal SIN. When the mode select signal MSEL indicates a general purpose asynchronous transmit / receive mode, the serial input signal SIN pin is provided as a serial data input. In contrast, when the mode selection signal MSEL indicates the IC card read mode, the serial input signal SIN pin is provided as an input / output pin for simultaneously transmitting / receiving serial data. In any mode, the internal serial input signal SINI is always driven by the serial input signal SIN.

Further, in the IC card read mode, the serial input signal SIN pin functions as an input / output signal pin, and when the internal serial output signal SOUTI is at a low level, the serial input signal SIN is at a low level. Changes to activate an external signal connected to it. When the internal serial output signal SOUTI is at a high level and the serial input signal is activated by the external signal, the serial input signal SIN is equal to the external signal. When the internal serial output signal SOUTI is at a high level and the serial input signal is not activated by the external signal, the serial input signal SIN is at a high level.

5 is a block diagram showing in detail a UART having an IC card reader according to a preferred embodiment of the present invention. The UART with an IC card read interface includes a general purpose asynchronous communication core 40, a multiplexer 50, an inverter 52, an inverting AND gate 54, a three-state inverter 56, and a full-state inverter. Up resistor 58. The general purpose asynchronous communication core 40 performs a general UART-specific asynchronous serial communication function, and has all signals necessary for asynchronous serial communication. The mode select signal MSEL is set and provided by the bits stored in the modem control register 62 of the general purpose asynchronous communication core 40.

The multiplexer 50 includes one input terminal connected to a transmission clock output signal * BAUDOUT, a type force terminal connected to an internal serial output signal SOUTI, a selection terminal connected to a mode selection signal MSEL, and a serial output. It has an output terminal connected with the signal SOUT. When the mode selection signal MSEL is at a high level (ie, in the IC card read mode), the transmission clock output signal * BAUDOUT is selected to be provided as a serial output signal SOUT. When the mode select signal MSEL is at low level, i.e., in the general purpose asynchronous transmit / receive mode, the internal serial output signal SOUTI is selected to be provided as the serial output signal SOUT. The inverter 52 has an input terminal connected with the internal serial output signal SOUTI. The inverted and gate 54 has one input terminal connected to the output terminal of the inverter 52 and a type force terminal connected to the mode selection signal MSEL. When the mode select signal MSEL is at a high level (IC card read mode) and the internal serial output signal SOUTI is at a low level, the output of the inverted and gate 54 is at a low level.

The tri-state inverter 56 may include an input terminal connected to an output terminal of the inverter 52, a control terminal connected to an output terminal of the inverting and gate 54, and an output terminal connected to the series input terminal SIN. Have The buffer 60 is used to make the internal serial input signal SINI equal to the serial input signal SIN. As is well known in the art, the buffer 60 is optional. The pull-up resistor 58 has one end connected to the output terminal of the tri-state inverter 56 and the other end connected to a power supply voltage (not shown). In other words, in the IC card read mode, when the internal serial output signal SOUTI is at the low level, the output of the tri-state inverter 56 (ie, the serial input signal SIN) is changed to the low level and connected. Activate the external signal. When the internal serial output signal SOUTI is at high level, the output of the three-state inverter 56 is in a high-impedance state. At this time, if the serial input signal is not activated by the external signal, the serial input signal SIN is pulled up to a high level by the pull-up resistor 58. Conversely, if the internal serial output signal SOUTI is at a high level and the serial input signal is activated by the external signal, the serial input signal is the external signal because of the high-impedance output of the tri-state inverter 56. Is activated the same as

While the invention has been described using exemplary preferred embodiments, it will be understood that the scope of the invention is not limited to the disclosed embodiments. Rather, the scope of the present invention is intended to include all of the various modifications and similar configurations. Accordingly, the claims should be construed as broadly as possible to encompass all such modifications and similar constructions.

According to the present invention as described above, the general-purpose asynchronous transmitter / receiver (UART) has an IC card reading interface, and directly controls the smart card interface in the IC card reader. Therefore, there is an effect that the manufacturing cost, energy source, and material consumption of the entire IC card reading system are significantly reduced.

Claims (6)

In a universal asynchronous transmitter / receiver (UART) having an IC card reader having at least a serial output signal and a serial input signal: A general purpose asynchronous communication core for asynchronous serial communication of at least an internal serial output signal, an internal serial input signal and a transmission clock output signal; A multiplexer having one input terminal connected to the transmission clock output signal, a type force terminal connected to an internal serial output signal, a selection input terminal connected to a mode selection signal, and an output terminal connected to a serial output signal; The transmit clock output signal is provided as the serial output signal when the transmit clock output signal is selected when the mode select signal indicates an IC card read mode, and when the mode select signal indicates a general purpose asynchronous transmit / receive mode. A serial output signal is selected and provided to the serial output signal; A three-state buffer coupled with the internal serial output signal, the internal serial input signal, the mode selection signal, and the serial input signal; The internal serial input signal is generated as the serial input signal is driven, the serial input signal becomes low level when the internal serial output signal is low level, with the mode selection signal indicating the IC card read mode, When the internal serial output signal is high level and the serial input signal is activated by an external signal, the serial input signal becomes equal to the external signal, the internal serial output signal is high level and the serial input signal is the external And said serial input signal is at a high level when not activated by a signal. The method of claim 1, And said general purpose asynchronous communication core provides said mode selection signal. In a universal asynchronous transmitter / receiver (UART) with an IC card reader: A general purpose asynchronous communication core for asynchronous serial communication of at least an internal serial output signal, an internal serial input signal and a transmission clock output signal; A multiplexer having one input terminal connected to the transmission clock output signal, a type force terminal connected to the internal serial output signal, and a selection input terminal connected to a mode selection signal; The transmission clock output signal is selected to be output from the multiplexer when the mode select signal is high level, and the internal serial output signal is selected to be output from the multiplexer when the mode select signal is low level; An inverter having an input terminal connected with the internal serial output signal; An inverting and gate having a one input terminal connected to an output terminal of the inverter and a type force terminal connected to the mode selection signal; A three-state inverter having an input terminal connected to the output terminal of the inverter, a control terminal electrically connected to the output terminal of the inverting and gate, and an output terminal electrically connected to the internal serial input signal; A general purpose asynchronous transmitter / receiver having an IC card reader, wherein one end is electrically connected to an output of the three-state inverter, and the other end comprises a pull-up resistor electrically connected to a power supply voltage. The method of claim 3, wherein And a buffer having an input terminal electrically connected to the output terminal of the tri-state inverter and an output terminal connected to the internal serial input signal. The method of claim 3, wherein And said general purpose asynchronous communication core comprises a modem control register used to provide a mode selection signal. In IC card reading system: An IC card reader having an IC card socket into which an IC card is inserted, and a smart card interface electrically coupled with the IC card socket to provide input / output signals necessary for accessing the inserted IC card; A general purpose asynchronous transmitter / receiver having an IC card interface electrically connected with the smart card interface to control the smart card interface to access the IC card and electrically connected with the transmitter / receiver to provide asynchronous communication function. An IC card reading system comprising a computer system comprising a.