JP2794043B2 - Portable electronic devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a portable electronic device such as an IC card capable of transmitting data to and from an external device.

(Prior Art) Recently, as a new portable data storage medium, a non-volatile memory (memory unit) and a CPU for controlling the same have been developed.
Built-in IC chip with control element (control unit) such as
IC cards are being developed. The data memory of this type of IC card has a fixed data storage unit.
Then, when storage of data longer than this data storage unit is requested, the storage request data is first divided by the maximum data storage unit length. Next, in order to maintain the validity of the data at the time of storage, the divided data is stored with data check information added. The stored data is stored with the length information added thereto.

When a request is made to read the stored data that has been divided and stored, all the divided data necessary to form the stored data are integrated, and the validity of the stored data is confirmed by the check information added to each of the stored data. After that, the process proceeds to the request process. At this time, every time the divided data is read,
When the length information is subtracted and the subtraction value becomes "0", the end of reading of the stored data is determined.

However, if there is an abnormality in the stored data or the length information, the data is output together with the abnormal end status as a response. However, since the length information is a subtraction number,
For example, if the length information is smaller than the correct value, the reading ends without reading some of the record data. For this reason, there is a disadvantage that it is difficult to analyze the location where the abnormality has occurred and to search the original stored data.

Therefore, when an abnormality occurs during reading of the stored data, the reading is terminated without partially reading the stored data, and it is difficult to analyze the location where the abnormality has occurred and to find the original stored data. There is.

(Problems to be Solved by the Invention) According to the present invention, when an abnormality occurs at the time of reading stored data, the reading is terminated without reading out part of the stored data. This eliminates the drawback that it is difficult to search for stored data.If an error occurs during reading of stored data, it is possible to prevent the reading from being completed without reading some of the stored data. It is an object of the present invention to provide a portable electronic device capable of analyzing a location of occurrence and searching original stored data.

[Configuration of the Invention] (Means for Solving the Problems) In a portable electronic device according to the present invention, storage data of one processing target to which length information is added is divided for each fixed length data. A data memory having a record data storage area for storing record data to which data check information for checking is added, and a control element for reading and writing fixed-length data in the record data storage area of the data memory Confirmation means for confirming the validity of each fixed-length data read from the data memory with data check information, and when an error is confirmed by the confirmation means, an error flag is assigned to an internal memory in the control element. Means for providing;
A buffer memory for storing storage data for each fixed-length data read from the data memory; and data read from the data memory and stored in the buffer memory from length information added to the first fixed-length data of the record data Subtracting means for subtracting the number; updating means for updating the subtraction result of the subtracting means to a number obtained by subtracting the read amount up to the present from the maximum storage capacity of the storage data when an error is confirmed by the confirming means; Judging means for judging the end of reading based on the subtraction result of the subtracting means; and when the judging means judges the end of reading, if no error flag is given to the internal memory in the control element, the The contents stored in the buffer memory are output to the external device together with the response status indicating the end, and the error is stored in the internal memory in the control element. If the flag is applied and is formed from an output means for outputting with the response status indicating an abnormal end of the storage contents of the buffer memory to the external device.

(Operation) The present invention relates to a method of reading out stored data from a data memory of a portable storage medium and transmitting the read data to an external device. The reference value for controlling the read amount of the storage data is changed to a value based on the total capacity of the storage data storage area.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 shows a configuration of a portable electronic device processing device according to the present invention, and a card reader / writer (external device).
It is composed of an IC card (portable storage medium) 12 and, for example, a predetermined record read command from the card reader / writer 11 is processed by exchanging a plurality of messages.

The card reader / writer 11 converts the command message to an IC card
12 and receives a response message from the IC card 12.

The IC card 12 includes a data memory 21, a control element (CPU) 2
2, a buffer memory 23, a counter 24, and the like.

A record data storage area 21a for storing record data (storage data) exists in the data memory 21, and as shown in FIG. 3, at least one capacity is divided into fixed-length words 31,. . In this word 31, storage information, storage data, and check information for guaranteeing the storage data are stored.

The record includes record data (storage data) and length information indicating the length of the record data.

When this record is stored in the record data storage area 21a, since it is stored in word units (fixed length), one record may not be one word. In this case, the record is divided by the word length, and the divided data is stored in each word. At this time, the length obtained by adding the record data to the length information does not need to be a positive multiple of the word length.

The above-mentioned word is provided with connection information between words storing the record data, and at the time of reading, the word is connected by the word connection information and the data in the word is matched to restore the record.

The counter 24 is a read counter. When record data is read, first, length information is set, and data of each word is read from the data memory 21 and stored in the buffer memory 23 so that the read is performed. The countdown (subtraction) is performed for the data.

When reading the record data, the control element 22 reads the stored data in word units and the check information, and checks the validity by comparing them,
When an error is determined, an error flag is stored in an internal memory (not shown). When the error flag is set, the control element 22 changes the value of the counter 24 from the total storage capacity corresponding to the number of words in which the record data is stored to the current read count (length information-current counter 24). To the value obtained by subtracting the count value of

Next, storage and reading of data in the IC card 12 in such a configuration will be described.

First, data storage will be described. That is, the data storage command message from the card reader / writer 11 is
Sent to IC card 12. Then, the IC card 12 is divided and stored in the data memory 21 with the storage data in the data storage command message as a predetermined record. For example, as shown in FIG. 3, data (one record) composed of length information and storage data is data 1, data 2, data 3,
Data memory divided into four words 31 of data 4
Stored in 21. At this time, each word 31 is provided with storage information and check information. The storage information is information used when the control element 22 searches for the data in the divided words, and the check information is information that can be performed by a CRC check or the like.

Next, reading of data will be described with reference to the flowchart shown in FIG. 1, that is, a read command message from the card reader / writer 11 is transmitted to the IC card 12. Then, the control element 22 in the IC card 12 reads out data in a part of the word of the designated record divided and stored in the data memory 21 with respect to the designated record by the read command message, and reads the length of the read data. The information is set in the counter 24 (ST1). Further, the control element 22 checks the validity of the data in the word based on the check information (ST2). If an error is found as a result of this check (ST
3) If the error flag is not set in the internal memory (not shown), the control element 22 sets the error flag and stores an error status code (ST4,
5). Further, the control element 22 subtracts the value of the counter 24 from the total storage capacity corresponding to the number of words in which the designated record is stored, by the read count number up to the present (length information-the current count value of the counter 24). (ST6).

Also, as a result of the above confirmation, if normality is confirmed, if the error flag has already been set, or if step 5
When the error flag is set and the error status code is stored, the control element 22 stores the data in the word in the buffer memory 23, and the counter 24 stores the data in the word.
Is counted down (subtracted) (ST7).
As a result, when the count value of the counter 24 is not “0” (ST8), the control element 22 confirms the validity of the next data in the word (ST9), and returns to step 3.

When the count value of the counter 24 becomes “0” (ST8), the control element 22 checks whether or not an error flag is set in an internal memory (not shown) (ST10). As a result, when the control element 22 is normal without the error flag set, the normal status code (normal end) stored in the internal memory together with the data in the buffer memory 23
To the response status and set the card reader / writer 11
(ST11, ST12), and if an error flag is set, an error status code (abnormal termination) stored in the internal memory together with the data in the buffer memory 23
To the response status and set the card reader / writer 11
(ST13, ST12).

As described above, the length information of the storage data is used as the initial value of the counter. However, when an error occurs, a value based on the total number of capacities of all words in which the storage data is stored is set in the counter, and an error occurs. Is retained by an error flag, and the occurrence of an error at the time of reading all words is known, thereby preventing a change in the counter value from being duplicated.

That is, when the storage data of the designated record is read from the data memory of the IC card and transmitted to the card reader / writer, when an abnormality occurs in the read storage data,
The value of the counter for controlling the read amount of the storage data based on the length information of the storage data is changed to a value based on the total storage capacity of all words in which the storage data is stored, and an error flag is set. Thereafter, in order to control the read amount with the changed counter value, all data of all words can be read. In the case of the second and subsequent abnormalities, the past error occurrence status is confirmed by the error flag, and if it is previously recognized that the abnormality has occurred, the counter is not changed and the counter change can be prevented from being duplicated. it can.

[Effects of the Invention] As described above in detail, according to the present invention, when an abnormality occurs during reading of stored data, it is possible to prevent the reading from being completed without partially reading the stored data. It is possible to provide a portable electronic device capable of analyzing an occurrence location and searching for original stored data.

[Brief description of the drawings]

1 is a flowchart for explaining a reading process, FIG. 2 is a block diagram showing a configuration of a portable electronic device and a card reader / writer, and FIG. FIG. 3 is a diagram for explaining a configuration example of a data memory and a record system. 11: card reader / writer (external device), 12: IC card (portable electronic device), 21: data memory, 21a: record data storage area, 22: control element, 23: buffer memory, 24: counter, 31 ... word.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) G06K 19/07 G06K 17/00 G06F 12/16 G06F 12/04

Claims (1)

(57) [Claims] 1. Record data in which one storage data to be processed to which length information is added is divided into fixed length data and stored as record data to which data check information for checking is added. A data memory having a storage area, a control element for reading and writing fixed-length data in a record data storage area of the data memory, and a data check for validity of each fixed-length data read from the data memory Confirmation means for confirming with information; provision means for providing an error flag to an internal memory in the control element when an error is confirmed by the confirmation means; storage data for each fixed length data read from the data memory And a buffer memory for storing the fixed-length data at the beginning of the record data. Subtraction means for subtracting the number of data read from the data memory and stored in the buffer memory from the length information stored in the buffer memory; and Updating means for updating the subtraction result of the subtraction means to the subtracted number; determining means for determining the end of reading based on the subtraction result of the subtracting means; When the error flag is not given to the internal memory in the control element, the storage content of the buffer memory is output to the external device together with the response status indicating normal end, and the error flag is given to the internal memory in the control element. Output means for outputting the contents stored in the buffer memory to an external device together with a response status indicating an abnormal end. Portable electronic apparatus characterized by.