JPS60207989A - Recording system of electronic device - Google Patents

Abstract

PURPOSE:To judge the recording condition of recorded data of a PROM by reading recorded data, and collating them with data from the outside, and recording flag bits showing the collated result. CONSTITUTION:An IC card 1 as an electronic device incorporates an IC chip and a connector part 3, and the former consists of a microprocessor MPU4 and a PROM5 for recording the data processed by the MPU4. When a telegram consisting of a recording command code, a zone name of the PROM5 and recorded data is given to the IC card 1 from a reader/writer, it is stored in a RAM9 through the connector part 3 and a control part 6 of the MPU4. Then the control part 6 checks a flag consisting of two bits in the PROM5, discriminates whether the flag is nonrecording or effective recording of data, recording errors, or test recording; records the data stored in RAM9 from an address next to the address, where the final word is effective, to the PROM5, reads the recorded data after the recording is finished, and finally records the collated result with input data in the flag.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an IC card that records transaction data each time a transaction is made, for example, in an IC card that is connected to a terminal such as an automatic transaction device via a league writer. This invention relates to recording methods for electronic devices such as electronic devices.

[Technical background of the invention and its problems]

Recently, IC chips have been used as memory cards to record information.
An IC card has been developed and put into practical use. This IC chip consists of a data memory composed of C20 and FROM K, and is designed to be built into an IC card. When accessing the PROM above,
Absolute addresses are widely used in the address part of instructions input from the outside.

However, in such a device, in order to write data to one zone of the FROM circle multiple times without creating a blank area, the data sending side must do the following:
It is necessary to always know the usage letter B of the FROM area by absolute address, and it is difficult to manage the FROM area money of each IC card in a special event where the sender is dealing with a large number of IC cards. It had the disadvantage of being.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to provide a recording method for an electronic device that can determine the recorded state of recorded data in a PROM using the minimum number of flag bits.

[Summary of the invention]

When recording data to the t'i FROM of this invention, the recorded data is read out, the read data is compared with the recorded data from the outside, and a flag viratra indicating the comparison result is recorded in correspondence with the recorded data. It was designed to encourage them.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an IC card as an electronic device, in which an IC chip is built-in. Above ICC shoes 2
As shown in FIG. 2, the connector 3 electrically connects the IC card 1 to an external league writer (not shown).
, an MPU (
It is composed of a microprocessor (microprocessor) 4 and a FROM 5 as a data memory in which data processed by the MPU 4 is recorded. The above-mentioned MPU 4 U decodes the command sent from the above-mentioned connect section 3, and the MPU d
a control section 6 that controls the operation of each section within the system, an arithmetic section 7 that performs numerical calculations as necessary depending on the type of command, and a ROM B that stores internal control programs and fixed data.
, instructions, and a RAM 9 for temporarily storing data.

The FROM 6 is divided into zones 1 to N according to necessity, as shown in FIG. The starting address, zone size, and word length of each zone above are in ROM B above.
are stored and managed.

In each zone of the FROM 5, data is recorded in word units as shown in FIG. 5, and in each word a V)2 flag and an L flag indicating the recording state are recorded.

If the above V flag is rlJ and the L7 lag is "1", it indicates unrecorded, and the ■ flag is rOJ and the L flag is r
In the case of lJ, it indicates a valid record other than the final word, and if the ■ flag is rOJ and the L flag is "0", it indicates a valid record of the final word, and if the ■ flag is [lJ, L7 lag is "0",
'' indicates a recording error or recording of test data, as shown in FIG.

When recording, the league writer outputs a message consisting of a recording command code, zone salt, and recorded data as shown in Figure 4, and during testing, a test command code and zone salt as shown in Figure 6 are output. and test data, and when reading, a message consisting of a read command code and zone salt as shown in FIG. 10 is output.

Next, the recording method of the present invention in such a configuration will be explained with reference to the flowchart shown in FIG. For example, a telegram consisting of a recording command code, zone salt, and recording data as shown in FIG. 4 is supplied to the IC card 1 from a league writer (not shown). This message is supplied to the control section 6 in the MPtJ d via the connection section 3, and is temporarily stored in the message 'i RAM 9 of the control section 6. Next, the control unit 6 decodes the message as a message for recording (STI).

Next, the control unit e trf- reads out the starting address, zone size, and word length of the corresponding zone from the ROMB based on the zone number in the address part of the message, and outputs it to the calculation unit 7. Then, the calculation section 7 calculates the final address of the zone, and the control section 6 causes the RAM 9 to store it. Then, the corresponding address of the control unit 6 [FROM, 9 is designated as an address.

Then, the control unit 6 sets the last address flag of that zone,
■Check the flags, and if all are invalid "1", 1
Check all the previous address OL flags and ■ flags. In this way, the V and L flags are searched one word at a time from the last address to the previous address ((ST2).Then, the control unit 6 determines which of the V and L flags is "o" and is valid. If , that address is determined to be the last recorded address,
The next address is determined to be the recording start address and is set in RAM 9 (ST3). Next, the control unit 6μRA
The record data stored in M9 is recorded one word at a time from the recording start address (ST4). After this recording, the control section 6 outputs the data ta that was just recorded, and matches the record data before recording. Check whether or not (S
T5). At this time, since the instruction code is a record (S
As a result of the check, the control unit 6 sets the ■ flag to rOJ, sets the toshi, and L flags to "1" if the last word is valid recording, and if the final word is valid recording,
■ Set the flag to "0" and the L flag to "0". If the error is due to mismatch, set the ■ flag to "1" and set the L flag to rOJ (ST7
, a).

In addition, the message includes a test command code as shown in Figure 6,
In the case of zone name and test data, steps up to step 5 are performed in the same way as for the recorded message described above. Then, when the test instruction code is determined in step 6, the control unit 6
Set the test data collation result in RAM 9K (ST9) and set the V flag at the corresponding address of FROM 5 to "1") L (ST7)'r Set the L flag to "1".
0” (ST,!?).

Next, the read operation will be explained with reference to the flowchart shown in FIG. For example, right now, league writers (
(not shown), a message consisting of a read command code and a zone name as shown in FIG. 10 is supplied to the IC card IK. This message is supplied to the control section 6 in MPU J via the connection section 3, and the control section 6 reads the message i RAM,
9 to temporarily memorize it. Then, the control unit 6 decodes the message as a read message (STzO). Then, the control unit 6, based on the zone number of the address part in the message,
Read the start address of the corresponding zone from ROM8, and
Address the corresponding address of OM& (sru). As a result, the control unit 6 sets "1" in order from the ■ flag at the first address.
Check 1ft for rOJ, and if it is "1" (ST12), check the next address, and if it is rOJ (5T12),
All data at this address is read out and output to a reader/writer (not shown) K via the connection section 3f. At this time, the control unit 6 determines whether the L79 signal corresponding to the data is "1" or "0".
If it is "l", specify the address of the next address (ST15) and return to step 12.
If it is "0", data reading ends.

As a result, the address where the ■ flag is "1", that is, the address where an error has occurred, is not read regardless of the state of the L flag, so that correct data is always output from the IC card I.

As mentioned above, flags indicating the data recording status, that is, unrecorded, valid recording, recording error, and test data recording, are recorded for each FROM address, so you can start recording by simply specifying the zone name. , it is possible to specify an address at the time of reading, and it is possible to avoid wasting the memory area when additionally recording. Further, during reading, recorded data of arbitrary length can be read out once ft, and correct data can be output.

In the embodiment described above, the recording data is written in units of words, but the invention is not limited to this, and other lengths may be used as long as the word length is constant within the same zone. For example, a part-time job (8
(byte) or in nibble units (4 bytes). Furthermore, the method for setting the L flag is also such that the valid flag trod and the invalid flag are set to "1", but the present invention is not limited to this, and rOJ and rlJ may be reversed depending on the type of FROM.

Furthermore, when recording data in the FROM, an operation of searching all unrecorded areas from the last address may be performed when the IC card is powered on. In this case, access time can be further reduced.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide a recording method for an electronic device that can determine the recorded state of recorded data in a PROM with a minimum of 7 lag bits.

[Brief explanation of the drawing]

The drawings are for explaining one embodiment of this invention.
Figure 1 is a perspective view of an IC card, Figure 2 is an IC chip s
Figure 3 is a diagram showing an example of storage in FROM, Figure 4 is a diagram showing an example of a message for recording, and Figure 5 is a diagram showing an example of FR.
Figure 6 is a diagram for explaining the recording state of OM, Figure 6 is a diagram showing an example of a test message, Figure 7 is a diagram for explaining the relationship between the recording status of FROM and flags, and Figure 8 is a recording operation. FIG. 9 is a diagram for explaining the readout operation, and FIG. 10 is a diagram showing an example of the bladder evacuation. 1... IC card (electronic device), 2... IC chip, 3... Connecting section, 4... MPU, 5... FR
OM, 6...Control unit, 7...Calculation unit, 8...RO
M, 9...RAM. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 6 Figure 8 Figure 9 Figure 10 Commissioner of the Patent Office Kazuo Wakasugi 1. Patent application for indication of the case 1986-63638 @ 3. Relationship with the case of the person making the amendment Patent applicant (307) Toshiba Corporation 5. Engraving of spontaneous amendment mυ (no change in content)

Claims (2)

[Claims] (1) In an electronic device having a cptr and a PROM, a recording means for recording external data in the FROM, a reading means for reading data recorded in the PROMK, and recording of data by the recording means. At the time, there is provided a collation means for reading the recorded data and collating the successively generated data with recorded data from the outside, and means for recording a flag bit indicating the collation result by the collation means in correspondence with the recorded data. A recording method for electronic devices characterized by: (2) The flag bit is composed of 2 bits, and depending on the combination of bits, it can indicate whether data is not recorded, valid recording, recording error, or test recording, and whether it is single word data or multi-word data. A recording method for an electronic device according to claim 1, characterized in that: 2. A recording method for an electronic device according to claim 1, wherein the recording method is based on detecting a response.