JPH0831119B2 - IC card data processing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an IC (Integrated Circuit) card used for various data processing, data transfer, etc. by incorporating a microcomputer, a memory, and a transmission / reception circuit in an integrated circuit. Data processing method

[Prior Art] Conventionally, an IC card can recognize an ID code in a contactless manner. Therefore, an FA (Factory Au
It is used for a tomation system and an entrance / exit management system.

In the FA system, for example, as shown in FIG. 4, an IC card 6 storing a necessary code and the like is attached to the side surface of the work 4 moving on the rail 2 to attach the work 4 to the IC.
A card read / writer 8 is installed for detecting necessary data with the card 6 and exchanging necessary data with the IC card 6, and the main processing unit 10 is connected to the card read / writer 8. That is, various processing such as processing and measurement for the work 4 and the processing position thereof are stored, and the processing operation is performed by wirelessly communicating with the main processing unit 10 side.

Further, in the entry / exit management system, the entry / exit person carries the IC card 6, communicates with the main processing device 10 at the check point, and monitors the exit / entry person.

In the IC card 6 used for such FA system and entry / exit management system, data processing, data transmission / reception, etc. are carried out by the built-in power supply, and when the voltage drops due to battery exhaustion, etc. Since it becomes impossible, it is necessary to monitor the power supply for abnormalities.

[Problems to be Solved by the Invention]

Conventionally, for example, a voltage drop is monitored as an abnormality of a power supply, and the result of the monitoring is transmitted from the IC card 6 to the main processing unit 10 side together with other data as data indicating the voltage abnormality.

By the way, the data transmitted by the IC card 6 is
As shown in Fig. 5, 1 character CR is the start bit
It consists of 8 bits of ST, data bit DT, parity bit PT and stop bit SP. Conventionally, 1 bit of data bit DT is used for transmission of battery consumption data, and battery consumption is transferred to the main processing unit 10 side. The method of announcing has been taken. In such a method, 20% of the total data length is spent for notification of battery exhaustion, so that bit is saved.
Efficient data transmission was hindered by suppressing the transmission of ID code.

Therefore, an object of the present invention is to realize a data processing method for an IC card, which makes it possible to efficiently transmit data representing battery consumption by using stop bits.

[Means for Solving the Problems] A data processing method for an IC card according to the present invention includes a data processing means (data processing unit 20), a means for transmitting / receiving data to / from the main processing device (10) (carrier oscillator 26, modulator 28, A data processing method for an IC card having a power supply (32) and a power supply (32) built-in, wherein a voltage abnormality of the power supply is detected, and this voltage abnormality is indicated by a stop bit representing stop data set at the end of one character. And is transmitted to the main processing unit side.

[Action]

In this way, by detecting the abnormality of the power supply built in the IC card, for example, the voltage abnormality due to the consumption of the battery, and expressing this abnormal state by the stop bit of one character, the stop data and the power abnormality can be detected. Efficient data transmission is realized without being disturbed by the data that is represented by 1 bit and the other bits are represented by the power supply abnormality.

〔Example〕

FIG. 1 shows a data processing method for an IC card according to the present invention.

The IC card 6 is, for example, formed into a rectangular card,
In the FA system, as shown in FIG. 4, an IC card 6 is attached to the work 4, and in the entrance / exit management system, the IC card 6 is carried by the entering / leaving person.

A loop antenna 12 for transmitting and receiving a radio wave which is a data transmission medium is installed in the peripheral portion of the IC card 6, and the IC card 6 is placed in the monitoring area of the card read / writer 8 on the main processing unit 10 side. Upon entering, the high-frequency signal transmitted by radio waves from the main processing device 10 side can be received. This high-frequency signal is applied to the tuning circuit 14 through the loop antenna 12, and the tuning circuit 14 causes the frequency of the carrier C _r to rise.
Since f _r equal tuning frequency f _r is set, the high-frequency signal of the frequency f _r is selected. This high-frequency signal is applied to the detection circuit 16, the detection signal of the data is detected by envelope detection in the detection circuit 16, and the detection output signal is amplified by the amplifier 18. As a result, the data processing unit
The data D _M is loaded into the main processing unit 10 from the data input terminal DATA.

Further, the IC card 6 is provided with a code setting section 22 for inputting a necessary code, and for example, an ID code of a person carrying the IC card 6 or an object to which the IC card 6 is attached is set. To be done. The code setting unit 22 sets, for example, 4 lines, 16 lines for setting the number of code patterns 2 ¹⁶ × 4.
It is composed of a matrix circuit of columns and the like, and a necessary code input is set by cutting an arbitrary row line or the like.

As shown in FIG. 2, for example, a microcomputer is installed in the data processing unit 20, a central processing unit (CPU) 201 for performing data processing, a program for performing data processing, and necessary data. Memory to store
202 and an input / output unit (I / O) 203 for inputting / outputting data are linked by an address bus 204, a data bus 205 and a control bus 206. The processing by this microcomputer is timed by the clock pulse generated by the crystal oscillator 24.

In the data processing unit 20, it is determined whether or not the captured data D _M is from the main processing device 10, and the main processing device
When it is determined that the data is from 10, the code output command signal C _{O is} output from the code output unit CODEOUT, for example, the data D _K shown in A of FIG. 3 is output. The code transmission command signal C _O is a high (H) low (L) 2-level switching signal and serves as a drive command for the carrier oscillator 26. For example, when the code transmission command signal C _O shifts to the H level, the carrier oscillator 26 starts operating, and the carrier oscillator 26 starts to operate at a frequency f _r of, for example, B in FIG.
The carrier C _r shown in is output. The carrier C _r is applied to the modulator 28 and pulse-modulated by the data D _K output as a modulation signal from the data processing unit 20.

The modulation output M _O obtained from the modulator 28 is amplified by the power amplifier 30, and then added to the loop antenna 12 to obtain the modulation output.
M _O is transmitted to the card reader-writer 8 as a radio wave.

A power supply 32 including a lithium battery incorporated in the IC card 6 is used for all the processes such as data processing and data exchange in the IC card 6. A voltage detector 34 is installed in order to monitor the consumption of the voltage of the power source 32, and the voltage detector 34 detects whether the voltage of the power source 32 is normal. The voltage detector 34 has a power supply 32
A switch SW that is switched according to whether or not there is an abnormality in the voltage V _DD is installed, and the voltage V _DD is applied from the power supply 32 connected to the data processing unit 20. Data processing unit 20 voltage V
_The crystal oscillator 24 oscillates by adding _DD , and after standby, the OSCON signal is output and applied to the switch SW. Therefore, the voltage detection unit 34 detects whether or not the power supply 32 is generating a normal voltage V _DD, and if it is normal, the switch SW is turned on and the OSCON signal is supplied via the switch SW to the power supply. Reset part 3
In addition to 6, the switch SW is cut off when the battery is replaced or when the voltage V _DD is an abnormal value.

Then, in the power reset unit 36, the voltage detection unit 34
The reset signal R corresponding to the detection output represented by the presence or absence of the CON signal is obtained. This reset signal R is OSCON
It is a high / low 2-level switching signal based on the presence / absence of a signal. For example, it is H level when normal and L when abnormal.
It becomes a level and indicates whether or not the voltage V _DD is normal. The operation of the power supply reset unit 36 is also used to perform an initial reset for the data processing unit 20 at the time of electrical exchange, and in that case, the power supply reset unit 36 becomes a latch operation.

Therefore, in the data processing unit 20, when the power supply 32 is normal, the reset signal R (H) from the power supply reset unit 36 is used.
3, the stop data of the stop bit SP placed at the end of one character CR represented by the high and low levels of the high and low 2-level signals is set to the H level. In this case, this data D _K and the third
The carrier D _r shown in FIG. 3B obtains the modulation output M _O shown in FIG. 3C and is sent to the main processing unit 10 side through the loop antenna 12. In the main processing unit 10, the stop bit SP
Is detected at the H level, the start-stop synchronization is achieved by recognizing the 1-character CR segment, and the power supply 32
Is known to be normal, and normal data processing is performed.

When the power supply 32 is abnormal, the data processing unit 20 sets the stop bit SP at the end of one character CR to L as shown in E of FIG. 3 based on the reset signal R (L). Change to level. In this case, this data
By D _K and carrier C _r shown in B of FIG. 3, F of FIG.
The modulated output M _O shown in is obtained and sent to the main processing unit 10 side through the loop antenna 12. On the side of the main processing unit 10, since the stop bit SP is at the L level, it becomes difficult to distinguish the next character CR, and since the synchronization information is lacking and the start-stop synchronization is not maintained, the reliability of the data thereafter is lost. ,
Stop accepting data. As a result, IC card 6 power supply
It turns out that 32 is abnormal.

In this way, by indicating whether or not the power supply 32 on the IC card 6 side is normal by using the stop bit SP of one character CR, an abnormality of the power supply 32 at the same time as the division of the character CR, for example, a voltage drop due to battery exhaustion You can know
The battery can be replaced as soon as possible.

In addition, in the embodiment, when the carrier is modulated by data, the pulse modulation is described as an example, but the present invention can use various modulation methods such as ASK modulation, FSK modulation, and PSK modulation.

〔The invention's effect〕

As described above, according to the present invention, the voltage abnormality of the power supply incorporated in the IC card is represented by using the stop bit indicating the stop data set at the end of one character. Abnormal voltage is 1
Efficient transmission of main data such as an ID code is realized without being disturbed by data that is represented by a bit and other bits are represented by a voltage abnormality.

[Brief description of drawings]

FIG. 1 is used for the IC card data processing method of the present invention.
FIG. 2 is a block diagram showing a configuration example of an IC card, FIG. 2 is a diagram showing a data processing unit in the IC card shown in FIG. 1, and FIG. 3 is a diagram showing an embodiment of a data processing method of the IC card of the present invention. FIG. 4 is a diagram showing an outline of the FA system, and FIG. 5 is a diagram showing one character of transmission data. 6 ... IC card 10 ... Main processing unit 20 ... Data processing unit (data processing means) 26 ... Carrier oscillator 28 ... Modulator 30 ... Power amplifier 32 ... Power supply CR ... Character SP ... Stop bit

Claims (1)

[Claims] 1. A data processing method for an IC card having a built-in power supply together with a data processing means, a transmission / reception means for the main processing device side, wherein a voltage abnormality of the power source is detected, and the voltage abnormality is detected at the end of one character. A data processing method for an IC card, characterized in that it is represented by using a stop bit that represents the stop data installed in the main processing unit.