JP3077911B2 - Portable electronic devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

 [Object of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable electronic device such as an IC card having a protocol for communicating data.

[0002]

2. Description of the Related Art Conventionally, there is an IC card as a portable storage medium. The IC card includes a ROM storing a control program, a data memory for storing various data, a CPU for performing various controls based on the contents of the control program in the ROM, and an electrical contact with an external device. A contact for exchanging data and the like is provided, and a protocol for performing data communication with an external device is provided in the ROM.

In recent years, various methods of using the IC card have been proposed, and for that purpose, it has been necessary to exchange data with various external devices in various places. However, since the conventional IC card has only one protocol for data communication, accurate data communication can be performed only for an external device having the protocol (or a protocol corresponding to the protocol). Could not be performed.

[0004]

As described above, since the conventional portable electronic device has only one protocol for performing data communication, it exchanges data with only a limited number of external devices. I couldn't do that.

Therefore, the present invention has a plurality of data communication protocols, and by selecting a data communication protocol in each case according to the external device, it is possible to accurately perform the communication even for an external device having a different type of communication protocol. It is an object of the present invention to provide a portable electronic device capable of performing data communication. [Configuration of the Invention]

[0006]

In order to achieve the above object, a portable electronic device according to the present invention comprises a first storage means for storing a plurality of programs corresponding to a plurality of types of communication protocols, and an external device. A second storage means for storing one of the plurality of types of communication protocols as an initial protocol used for communication with an external device at the start of the communication, the identification information being stored in the second storage means; Communication means for performing communication with an external device using a program of one communication protocol corresponding to identification information, and an IC corresponding to a plurality of programs stored in the first storage means.
An output unit that outputs type information of a protocol supported by the card to an external device; and, when receiving protocol-designated data from the external device, the identification information stored in the second storage unit is output to the external device. And a protocol changing unit for changing the communication protocol used by the communication unit by changing the identification information of the protocol specified by the data received from the communication unit.

[0007]

When data communication is performed with an external device, a predetermined communication protocol corresponding to the external device is designated from the plurality of communication protocols of the portable electronic device by designating the external device. Selected, and data communication can be performed using the selected communication protocol. Thus, accurate data communication can be always performed even with an external device having a different data communication protocol.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an IC card will be described below in detail with reference to the drawings.

First, an internal configuration of an IC card 1 according to this embodiment will be described with reference to FIG. In the IC card 1,
A mask ROM 2 storing a control program, a data memory 3 such as an EEPROM for storing various data, a CPU 4 for performing various controls based on the contents of the control program in the mask ROM 2, a reader / writer, etc. A contact portion 5 and the like for electrically contacting an external device and exchanging data and the like are provided. The mask ROM 2 is provided with two types of protocols A and B for performing communication. I of this embodiment
When the C card 1 communicates with an external device, the CPU 4 performs control according to the protocol A or B program stored in the mask ROM 2. In addition, the CP
A RAM (not shown) is provided in U4.

Next, an operation when data communication is performed with an external device (reader / writer) using the IC card 1 of the present embodiment will be described with reference to FIGS. First, the CPU 4 determines the address $ 000 in the data memory 3.
Reads 0 data, nibble on this data it is determined whether 0 _H (step 1). Here, address $ 0
If the upper nibble of 000 is 0 _H , CPU 4
It is determined that the C card 1 supports only one of the communication protocols of the protocol A and the protocol B (hereinafter, referred to as case 1), and performs processing starting from step 2 described later. Further, in step 1, if nibble on the data of the address $ 0000 of data memory 3 is other than 0 _H, CPU 4, the I
The C card 1 supports two types of communication protocols, protocol A and protocol B. It is determined that one of them can be appropriately designated by an external device (hereinafter, referred to as case 2), and the process proceeds from step 14 described later. Perform the processing that starts.

First, the processing when the IC card 1 supports either the protocol A or the protocol B (case 1) will be described with reference to FIG. Here, in the IC card 1, the CPU 4 operates by supplying power and a clock signal from an external device. First, a reset signal is transmitted from an external device to the CPU 4 before performing data communication.
When the reset signal is released, the CPU of the IC card 1
4 outputs the initial data called "Anserto Reset" to the external device. This "Anser to Reset"
Data for defining the type of communication protocol supported by the IC card 1 is included, and the external device receives the data and checks the communication protocol with the IC card 1.

At this time, the CPU 4 in the IC card 1
Before sending the above-mentioned "Anser to Reset" to the external device, the address $ 0000 in the data memory 3
Reads the data, address $ on nibble 0 After confirming that the _H (step 1) of 0000, under nibble of the data to determine whether 0 _H (Step 2). At this time, if the lower nibble of the data at address $ 0000 is a 0 _H, CPU 4 outputs the "communication protocol is protocol A" shows the effect "Anser to Reset" (Step 3), the protocol A To wait for a command from the external device (step 4). Then, until a command is input (step 5), a command A wait state is maintained by the protocol A. Also, if other than the lower nibble 0 _H data of the address $ 0000 in step 2, CPU 4 outputs the "communication protocol is a protocol B" shows the effect "Anser to Reset" (Step 6), protocol At B, the process shifts to a command waiting state from the outside (step 7). In this case as well, the command wait state is maintained by the protocol B until some command is input (step 8).

Subsequently, when a command is received from an external device, the CPU 4 first checks whether this command is a data communication end command (step 9). If it is not the data communication end command, after processing corresponding to this command is performed (step 10), the data memory 3
The value of address $ 0000 of the inner reference again under nibble of data checks whether 0 _H (step 11). Then, if the lower nibble of address $ 0000 is a 0 _H, after outputting to the external device a processing result in protocol A (step 12), step 3 described above Protocol A
Return to the command waiting state. Further, in step 11, if it is other than the address $ lower nibble 0 0000 _H, after outputting to the external device a processing result in protocol B (step 13), step 6 described above Protocol B
Return to the command waiting state. If the received command is the data communication end command in the step 9, the CPU 4 ends the data communication processing.

Next, the data communication processing of the IC card 1 when the IC card 1 supports two types of communication protocols and either of them can be designated by an external device (case 2) will be described with reference to FIG. explain. First, as described above, the CPU 4 operates by supplying power and a clock signal from the outside to the IC card 1. After the reset signal is released, the CPU 4
It reads the data of the address $ 0000 data memory 3, after confirming that nibble on the data of the address $ 0000 is other than 0 _H (step 1), the lower nibble of the data or not 0 _H or Confirm (Step 1
4). At this time, if the lower nibble of the data of the address $ 0000 is 0 _H , the CPU 4 sets the protocol A to the first priority protocol (hereinafter, referred to as the first protocol) and the protocol B to the second priority protocol (hereinafter, referred to as the first protocol). "Anser to Rese"
t "to the external device (step 15), and the CPU
Specific address of RAM 4 to store the 00 _H (step 16). Then, the process shifts to a state of waiting for a command from the external device according to protocol A (step 17). When any data is received in the command waiting state in the protocol A, the CPU 4 first receives the data as a PTS (Protocol Type Selection) for selecting a communication protocol.
Check if the data is for use (Step 1)
8).

If the received data is PTS data, it is checked whether the PTS data is data for protocol B designation (step 1).
9), if so, after storing the 01 _H to a specific address of the RAM in the CPU 4 (step 22), moves to the command wait state by the protocol B in step 23 to be described later.

In step 18 described above, if the received data is not PTS data, or if the PTS data is not PTS data for protocol B designation in step 19, it is determined whether the subsequently received data is a command. (Step 20), and if the received data is not a command, the process returns to a command waiting state according to protocol A (step 17).

In step 14, the address $ 0
If the 000 under nibble of the data of other than 0 _H, CPU
4 outputs the first protocol a protocol B, and "Anser to Reset" stating the protocol A second protocol to an external device (step 21), stores the 01 _H to a specific address of the RAM in the CPU4 (Step 2
2). Then, a transition is made to a state of waiting for a command from an external device using protocol B (step 23). When any data is received in the command waiting state by the protocol B, the CPU 4 first checks whether the data is PTS data (step 24). If the received data is PTS data, it is checked whether the PTS data is data for protocol A designation (step 25).
After storing the 00 _H to RAM at a specific address in the U4 (Step 16), moves to the command wait state by the protocol A in step 17 described above. If the received data is not PTS data in step 24 described above, or if the PTS data is not PTS data for protocol A designation in step 25 described above, it is determined whether or not subsequently received data is a command. If the received data is not a command (step 26), the process returns to the command waiting state using protocol B (step 23).

When the CPU 4 determines in step 20 and step 26 that the data received from the external device is a command, in any case, the CPU 4 first determines whether the command is a data communication end command. Is confirmed (step 27). If the received command is not the data communication end command, the command is processed (step 2).
8) Check the contents of the specific address of the built-in RAM (step 29). Then, if the content is 00 _H at a specific address of the RAM to output the processing result of the command in protocol A (step 30), the flow returns to the command wait state in protocol A in the previous step 17. Further, in step 29, the contents of the specific address of RAM to output the processing result of the command at 00 _H unless protocol B (step 31), the flow returns to the command wait state in protocol B in the previous step 23 . If the CPU 4 determines in step 27 that the received command is the data communication end command, the data communication processing ends.

As described above, the IC card 1 of the present embodiment
When performing data communication with an external device using the
The CPU 4 of the card 1 reads the address $ 0 of the data memory 3
000 is referred to as initial data, and a protocol to be used for data communication is determined based on the data. Therefore, when it is desired to change the communication protocol, it is necessary to rewrite the initial data. The processing in this case will be described with reference to FIG.
When rewriting the initial data, first, an external device sends an initial data change command in a format as shown in FIG. 6 to the CPU 4 of the IC card 1. This command includes a function code indicating a change in initial data and data to be changed. The CPU 4 of the IC card 1
When this command is received, the changed data is written to the address $ 0000 of the data memory 3 (step 1), and it is checked whether or not the writing has been normally performed (step 2). If the writing has been performed normally, a response indicating a normal end is created (step 3). If the writing has not been performed normally, a response indicating an abnormal end is created (step 4). The response created in this manner is output to the above-described processing result output processing (step 12 or step 1 in case 1).
3. Step 30 or step 3 in case 2
1) is output to an external device. For example,
By using this command, the communication protocol supported by the IC card 1 can be changed from the external device even in the case 1 described above.

As described above, the IC card 1 of the present embodiment can switch the communication protocol in accordance with the external device that performs data communication, so that the external device having a different type of communication protocol can be used. Also, data communication can be performed accurately. As a result, the versatility of the IC card is enhanced, and a system using the IC card can be flexibly constructed.

Further, since the communication protocol can be switched by an external device, for example, when a plurality of terminals having different communication protocols are connected and data is alternately transmitted from these terminals, the communication protocol corresponding to each of the terminals is exchanged. By properly switching to the above, accurate data communication is possible.

When a plurality of communication protocols can be supported as described above, priorities are given to the plurality of communication protocols in advance, and the highest-priority communication protocol is selected at the same time as the start. You can also. Thus, for example, if the communication protocol with the highest frequency of use is set to the highest priority, data communication can be performed with the communication protocol with the highest frequency of use at the same time as the activation.

The IC card of this embodiment can be set to support a plurality of protocols or only a single communication protocol, and can support only a single communication protocol. Even in this case, the type of communication protocol that can be supported by the IC card can be changed. Thus, for example, for an IC card used only for one terminal, only a communication protocol dedicated to the terminal may be supported. Furthermore, the various settings as described above correspond to the addresses in the data memory 3.
Since it can be performed only by rewriting the contents of 0000, it is extremely simple.

The communication protocol possessed by the IC card is not limited to two types, but may be one having three or more types of communication protocols and switching between them as appropriate.

[0025]

As described above, the portable electronic device of the present invention has a plurality of data communication protocols in advance, and can change the communication protocol used for performing data communication each time. As a result, data can be accurately communicated to external devices having different types of communication protocols.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an internal configuration of an IC card according to an embodiment.

FIG. 2 is a flowchart (1) illustrating a flow of a process when data communication is performed by the IC card according to the embodiment;

FIG. 3 is a flowchart (2) for explaining the flow of processing when data communication is performed by the IC card according to the embodiment;

FIG. 4 is a flowchart (3) illustrating a flow of a process when data communication is performed by the IC card according to the embodiment;

FIG. 5 is a flowchart illustrating a flow of processing when initial data is rewritten in the IC card of the present embodiment.

FIG. 6 is a diagram for explaining a format of an initial data change command.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Multifunctional IC card 2 ... Mask ROM 3 ... Data memory 4 ... CPU 5 ... Contact part

Claims (1)

(57) [Claims] A first storage unit for storing a plurality of programs corresponding to a plurality of types of communication protocols; and, when starting communication with the external device, one of the plurality of types of communication protocols is communicated with the external device. A second storage means for storing the identification information as an initial protocol used for communication, and an external device using one communication protocol program corresponding to the identification information stored in the second storage means. Communication means for performing communication; output means for outputting, to an external device, type information of a protocol corresponding to a plurality of programs stored in the first storage means and supported by the IC card; when receiving the specified data, identification of the designated protocol identification information stored in said second storage means by the data received from the external device By changing the information, portable electronic device characterized by comprising and a protocol changing means for changing the communication protocol used by said communication means.