JPS634486A - Information recording system - Google Patents

Abstract

PURPOSE:To prevent illegible data from being recorded later at the time of using a recoding medium after power trouble or the like by setting a write head address as A and the number of write bytes as B respectively to apply write on the recording medium in the order of specific address. CONSTITUTION:It is supposed that the data is recorded already up to an address A-1, and data of a write byte number B(=6) is written after a write head address A. The recording is executed from an address A+B-1, that is, addresses A+4, A+3,..., A in this order. It is supporsed that a data (03)16 is written on the address A+5 and data is written on the address A+4 and a trouble such as power failure takes place. When the first idle address (an address whose memory content is FF16) is retrieved from the address 0 by a microcomputer 8 to record data on a memory card 2 having a trouble next, the address A is detected and since a memory address whose memory content is not FF16 after the address A, the presence of any trouble is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an information recording method for recording information on an electrical, magnetic, optical, or other recording medium.

(Prior art) In recent years, chip cards, memory cards, microcomputer cards, and electronic cards (hereinafter referred to as IC cards) with built-in IC chips such as microcomputers and memories have been proposed, and their memory capacity is increasing year by year. However, since it is still expensive, effective use of memory is required.

Hereinafter, a conventional information recording method will be explained using an IC card as an example of a storage medium.

When writing only specific data to a single IC card, such as data whose contents are known in advance, such as measurement date and measurement weight, set the memory address to the first memory address.
If you allocate it as shown in Figure 5, 5 bytes (the data in Figure 15 is expressed in hexadecimal, and 1 byte represents a 2-digit number) will contain the data for one measuring valve. Can be recorded.

Therefore, if data is recorded in sequence starting from address 0 in the memory with a fixed data length of 5 bytes, the memory can be fully used.

One IC card can store various data such as weight data (
When recording a mixture of blood pressure data (measurement date, measured weight) and blood pressure data (measurement date, systolic blood pressure value, and diastolic blood pressure value), the weight data is recorded in 5 bytes, and the blood pressure data is recorded in 5 bytes, as shown in Figure 15. As shown in Figure 16, 7 bytes are required and the data lengths are different. In such a case, if information identifying whether the recorded data is weight data or blood pressure data is not recorded at the same time, it will not be possible to distinguish when reading the data.

When recording with a fixed data length (method in which the number of data bytes recorded in one measurement is fixed), it is necessary to match the length of the longest data. Since the first address of each data is recorded as a fixed data length, it has the advantage of being able to be determined by calculation, but it has the disadvantage that there is unused memory to match the length of the longest data, making it impossible to use memory effectively. There is.

Therefore, when recording with variable data length (a method that varies the number of data bytes recorded in one measurement), in addition to the data identification information mentioned above, information representing the data length must also be recorded. Otherwise, it will not be possible to identify the extent of the data when reading it. For example, as shown in FIG. 17, a 4-bit data identification code and 4-bit data length are recorded as one byte before the data as a control code.

In this case, one byte is required for the control code, but there is an advantage that the memory can be used fully.

In the above recording method, the first empty address is searched from the beginning of the memory (if the memory is PROM, it is expressed in hexadecimal (FF))
This means that the address is recorded starting from the address that is remembered.

An example of a data recording method in which the recording length is fixed is the IC card shown in Jikai No. 58-209000, but even if this idea is extended to a variable length method,
In the case of the trouble shown below, data r1 recovery becomes impossible.

Now, an example will be explained in which the data shown in FIG. 17 is recorded starting from address 0.

Complete recording of data at addresses 0 and 1 on the scale, and
When attempting to record data at address 2, if the power is turned off due to a power outage or if the IC card is mishandled, nothing will be recorded at address 2. Therefore, when you next measure your blood pressure with another blood pressure monitor and record it on the IC card, it is unknown if there is a power outage problem or the card has been removed from the IC card. Blood pressure data is recorded from the empty address 2 of 9f1.

When this IC card is read, as shown in Figure 18, the control code at address 0 cuts off the weight data with a data length of 5 bytes and reads the data at addresses 1 to 5. It turns out to be incorrect data of 1513Ky.

Such an error occurs for all data recorded after the above-mentioned trouble occurred, and the card has the disadvantage that the data on that card becomes unusable.

(Objective of the Invention) The present invention solves the above-mentioned technical problem, and even if a power supply trouble such as a power outage occurs during recording to a recording medium, or if the recording medium is handled from a connector etc., the recording medium To provide an information recording method which detects troubles when recording data and prevents recording of unreadable data due to tampering.

(Configuration of 1 Ming) In the present invention, when the reading start address is 8 and the number of written bytes is B, reading into the recording medium is A +
From address B-1 to address A+B-2, etc.

It is written in the order of address A.

With this method, when using the recording medium next time after a power supply problem, etc., if the first empty address is searched from address 0, address A will be detected, and there will be no memory address after address A that is not empty. If it exists, that memory address is detected, and therefore it is detected that there is some kind of trouble.

(Embodiment) FIG. 1 shows an example of a memory card information recording device in which the information recording method of the present invention is adopted.

In FIG. 1, a contact 1 is, for example, a connector, and is used to exchange signals with a memory card 2. As shown in FIG. The power supply circuit 3 has a program voltage VPP and a memory power supply V. In addition to generating C, its program voltage ■
It controls PP.

The I10 boat 4 exchanges signals with the memory card 2 via the contacts 1 and also receives the program voltage
It outputs a signal to turn on PP, a signal to operate the operation lamp 5 indicating that writing is in progress to the memory card 2, a signal to operate the error lamp 6 to display an error, and a measurement circuit (e.g. weight scale, blood pressure monitor). 7
It is used to exchange signals with.

Microcomputer 8 connects I10 boat 4 to υ111
11, it takes in measured values from the measuring circuit 7 and controls input/output of data to and from the memory card 2.

The calendar circuit 9 counts the dates held by the output of the battery backup circuit 10. Note that the read/write operations of the memory card 2 are the same as those of a general PROM, so a description thereof will be omitted.

Next, an information recording method according to the first embodiment of the present invention will be explained. 2 to 4 show memory maps of the memory card 2. FIG.

Assume now that data has already been recorded up to address A-1 as shown in FIG. Hereinafter, memory addresses where data are recorded will be indicated by diagonal lines. Assuming that the measuring device is a weight scale, data of the number of written bytes B (=6) from addresses 0 to 5 in FIG. 17 is written and stored after the first address A.

In this embodiment, addresses A+B-1, that is, addresses A+5 to A+4, A+3, . . . , A addresses are recorded. Address A+5 is (03)16 as shown in Figure 3.
Write. Next, as shown in Figure 4, at address A+4 (
01) Place the sleeve at address A+3 (13) 16, etc.
Write data up to the address. In this way, the write operation is completed in the pointed state as shown in FIG. 4, and as a result, at this point, the write state is exactly the same as when data is written sequentially from address A to address A+5.

Now, in the read/out state shown in Figure 3, that is, when <03)m is written to address #5A+5 and then the data is written to address A+4, a power supply problem such as a power outage occurs, or Assume that a trouble occurs in which the memory card 2 is removed from the contacts 1. In this case, the memory contents at address A+4 will change depending on the timing of the trouble (+,
, , that is, it may be in an unrecorded state, (0
1) In the middle of writing 16, some bits may become 0, or may become (01) re, which is an undefined write state.

However, while address A+4 is in an undefined read/write state, addresses A to A+3 are stored in an unrecorded state (FF'16).

In other words, when the microcomputer 8 tries to record data next time on the memory card 2 that had the above-mentioned trouble, it will write the data from address 0 to the first empty address (memory contents are (F)).
When searching for address (F ) 16), address A can be detected, and since there is a memory address after address A whose memory content is not (F F ) 1a, it is detected that some kind of trouble has occurred. can do. When the microcomputer 8 detects such a trouble, the microcomputer 8 lights up the error lamp 6 via the I10 port 4 to indicate that an error exists. The first memory content (FF) 1s is detected from the address where the memory content is (FF) 1.
To check whether there is an address that is 6, it is sufficient to check the number of addresses equal to the maximum value of the number of written bytes B. For example, in this case, the data length of the control code is 4 bits, so the maximum data length is 15 bytes (the number of bytes written in B is 16 bytes including 1 byte of the control code), so if you check up to address A+15, It will be a good thing.

FIG. 5 is a flowchart for explaining the general flow of the microcomputer 8.

In FIG. 5, in step m1, O of the memory card 2 is
The data is read sequentially from the address, and the memory contents are (
F F ) +a is detected, and the address is set to 8. In step m2, it is determined whether the memory contents of 15 bytes after A+11 are all (FF) kudzu.
When the memory contents are all (FF) 16, step m3
, data is written sequentially from address A+B-1 to address A, but if the memory contents are not all (F F ) 1a, an error is displayed.

FIG. 6 is a flowchart for explaining the detailed operation of Ila Risen in the first embodiment.

In step n1, the microcomputer 8 takes in measurement data from the measurement circuit 7 via the I10 port 4. In step n2, the stack pointer of the recording data table 8a, which is a table for storing data to be recorded on the memory card 2, is set to "C", and in step n3, a control code is generated and set to rCJ. In step n4, date data, which is calendar information, is fetched from the calendar circuit 9 and stack address C+1.0+2°C+
3. Generate and set year data, month data, and day data. In step n5, measurement data from the measurement circuit 7 is generated and set at stack addresses C+4 and C+5. In this embodiment, in step n6, the number of bytes B to be written to the memory card 2 is set to "6", and in step n7, the operation lamp 5 is turned on to notify that the writing process to the memory card 2 will now be performed.

In step n8, a memory card address counter for specifying the address of the memory card 2 is set in rOJ, and in step n9, the value of the memory card address counter is output as an address signal for the memory card 2.

In step rJ, the memory card data recorded at the address of the memory card 2 indicated by the address signal is read out. In step n11, it is determined whether the read memory card data is (FF)w,
Step n when the memory card data is not (FF)w
Moving to i2, in order to check the contents of the next address of memory card 2, the value of the memory card address counter is incremented. On the other hand, when the memory card data is (FF)m at step n+1, it is determined that the address of memory card 2 at that time is an empty address, and the process moves to step nt3, where the memory nine-door address counter value at that time is determined. Set to A. In step n+4, in order to check how far after the address where the first (FF)m is detected to be (FF)+a, the maximum value of the number of written bytes B, that is, the data length in this embodiment, is checked. Since the maximum length is 15 bytes, the number of bytes n is set to "15".

In step n15, in order to read the memory card data at the next address of memory card 2, the memory card address counter value is incremented, and that value is output as a memory card address signal.In step n+s, the memory card address signal is Reads the memory card data at the specified memory card 2 address. In step nν, the read memory card data (F
F ) +a is judged, and if the memory card data is not (FF)16, the process moves to step n 3G, turns on the error lamp 6, and the memory card data is (FF)16.
F) When it is frost, proceed to step n15. step n
In step 1s, the number of bytes n at step n% is decremented, and in step n19, the processes from step 015 to step n19 are repeated until the number of bytes n becomes "0", and the data search for 15 bytes of memory card 2 is completed. When finished, the process moves from step n19 to step n2G.

In step n20, in order to transfer data from address A+5 to address A of memory card 2, the memory card address counter is set to rA+5J, and in step n21, the number of bytes n is written and the number of bytes is 8, and the next step n
The process moves on to step 22. In step n22, the memory card address counter 1 set in step n20 is
output as a memory card address signal. As a result, the address of memory card 2 is specified, and step n
At step 23, the data at address C+n-1 of the recorded data table 8a is inserted into the address of the memory card 2. step n
At step n24, memory card data is read from the address of the memory card 2 specified by the memory card address signal at step n22. In step n25, it is determined whether the read memory card data is the same as the data written in step n23. If not, the process moves to step n30 and the error lamp 6 is lit; Proceeding to step n26, the value of the memory card address counter is decremented. That is, the decrement is performed to designate an address higher than the address of the memory card 2 designated by the memory card address counter value in step n22. step n
At step 27, the number of bytes n at step n21 is decremented, and at step n28, the processes from step n22 to step 02a are performed until the number n of bytes becomes "0", and when the number of bytes n becomes "0", the bytes are aB(-15
> data is corrupted from address A to address A+15 of memory card 2. However, the written order is A+15
This is done in the order from number to address A. In this way, when the old data has been transferred to the memory card 2,
In step n29, the operation lamp 5 is turned off.

According to this first embodiment, if a power supply problem or a problem such as removing the memory card 2 from the contact 1 occurs while recording data to the memory card 2 due to the judgment process in step n17 or step n25, the next time the memory card 2 is It is possible to detect that there is a problem when using the card 2.

Next, an information recording method according to a second embodiment of the present invention will be explained.

In the first embodiment, it is possible to detect that there is a problem with the memory card 2, but no more data can be recorded on the memory card 2. This is because if there is a power supply problem while recording data to memory card 2, the address where the control code should be recorded will be changed to (F
F) This is because the address is in 16 states, that is, it is an empty address, and the data length is not recorded correctly. Therefore, in the following second embodiment, the above-mentioned problem is solved, and even the memory card 2 which has a problem can be used continuously from now on.

FIG. 7 is a code explanatory diagram showing an example in which only one bit of write data valid/invalid pit is provided in the control code in the second embodiment.

The control code consists of a 1-bit valid/invalid pit, a 3-bit data identification code, and 4-bit data. If the memory is a PROM, the memory content is "1" in a state where data has not yet been written to -U, so the valid/invalid pit is determined to be "1" valid and "0" invalid. Since the data identification code in the control code is 3 bits, it is possible to identify and record 8 types of data, but if you want to increase the number of types or increase the data length, the control code should be 2 bytes or more. Just do it.

FIG. 8 is a flowchart for explaining the general processing of the second embodiment.

In step S1, data is sequentially read from address 0 of the memory card 2, and the read memory contents are first (
Let A be the address which is FF)16.

In step S2, 1 after address A+1 of memory card 2 is checked to see if there is a power supply problem or not.
It is determined whether all 5 bytes of memory card data are (FF)w, that is, whether there is a recorded address after an unwritten address, and when all are (FF)1a, the process proceeds to step S3. The data is read in and out sequentially from address A+B-1 to address A. However, the above B indicates the number of written bytes.

Also, in step S2, when it is determined that all 15 bytes of memory card data after address A+1 are not (FF) 1 (when there is a power supply problem), step S
Moving on to step 4, the memory card data is not (FF) 1B.
That is, the first recorded address is S, the last address where the memory card data is not (F F ) +6 is E,
In step S5, a special code (OO) 1 is written as memory card data from address A+1 to address S-1, that is, a recorded address detected after an unwritten address.
Write a.

In step S6, a control code with a data length of EA and a valid/invalid bit of O (corresponding to a special code) is written to address A of the memory card 2 (corresponding to an unwritten address in this case). Then, in step S7, address E+1 is set as address A, and the process moves to step S3, where A+B
Write data sequentially from address -1 to address A.

Next, referring to the memory maps shown in FIGS. 9 to 13,
The features of the second embodiment will be explained.

Suppose that when the memory card 2 is in the memory state shown in FIG. 9, a power supply problem occurs or the memory card 2 is removed from the contact 1. Next, in order to write data to the memory card 2 again, the power is turned on, and the memory card 2 is inserted into/taken out from the contact 1. After this, when data is inserted into the memory card 2, the address where the memory card data is (F F ) +s is detected, and the detected address becomes address A in the case of FIG. Next, check whether all 15 bytes after address △+1 (because the data length is 4 bits) are (FF)1a, and if all the memory card data in those 15 bytes is (FF)16. For example, if Fig. 9 shows that there was no trouble, then A+4. Data is recorded at address A+5.

Therefore, first the address where memory card data other than (FF)w is recorded is S (A+4 in FIG. 9), and finally the address where memory card data other than (FF)1a is recorded is E( In FIG. 9, it is set as A+5). Next A
+1 and S are compared, and if A+1<S, that is, if there is an address in addition to address A where memory card data (FF) m is recorded, the memory card data (
FF) Special code (OO) +a for all addresses that are T6
Write. The data of this special code (00)T6 is (
FF) Anything other than the linen is fine. When writing such a special code (OO) 16, it is written from the later address as shown in FIG.

After that, data length E-△ (A+5- in Figure 9) is placed at address A.
A = 5), and the control code with the valid/invalid bit set to 0 (the data identification code is also O) (05) + a is read in (Figure 11). In the state shown in FIG. 11, when the memory card 2 is read and processed after a trouble occurs, it is possible to read the control code at address A and determine that the following 5 bytes are invalid data. After that, E+1
Data is written using the method of the first embodiment, setting the address as address A (FIGS. 12 and 13).

Next, the operation of the second example will be explained with reference to the flowchart shown in FIG.

The processing of steps p1 to ρ3o in FIG.
Since the processing is the same as that of steps n1 to n30 shown in the figure, the explanation will be omitted.

In step D17, the memory card data (F
When it is determined that it is not F) ya, that is, when it is determined that there is a trouble, the process moves to step D3j, and the memory card address counter of l11 is
F ) address where data other than 1o is recorded), and in step p32, the counter value S is finally set to (F
F) If it is equal to address E where data other than 115 is recorded, it is 7 noks. In step D33, the byte In in step p14 is decremented, and in step p34 it is determined whether the number of bytes n is "Oj". If it is not "0", the process moves to step p35, and if it is "0", step Move to p41. In step D35, the memory card address counter value is incremented and the value is output as a memory card address signal, and in step D36, the memory card data at the address of the memory card 2 indicated by the address signal is read out.

In step p37, it is determined whether the read memory card data is (FF)+s, and when the memory card data is (FF)+a, step p38
If the memory card data is not (F F ) 1a, other data is recorded, so proceed to Step D]
9, the memory card address counter value at that time is set to E. Step D'! At step 8, the byte fin is decremented, and when the byte number n is determined to be O at step p4o, the process moves to step D4+. Step 041
Now, it is determined whether A+1 is smaller than S. In other words, if A+1<S, in addition to address A, there is
There is an address where a is recorded, in that case step C)
Step D458 sets the number of bytes n to 5-Al, and step D46 outputs the memory card address as A+n.

In step D47, the special code (00)16 is inserted into all addresses other than address A which are (FF)s in the middle.

In step p4a, memory card data is read from the memory card 2, and in step 049, it is determined whether the read memory card data is the same as the data written in step p47, and if it is, step p501
．． :n Decrement the number of rebytes n. If it is determined in step p49 that the read data and the old data are different, the process moves to step p30 and the error lamp 6 is turned on to display an error.

When it is determined in step C151 that the number of bytes n in step D50 is O, or when it is determined that A+1≧S in step D41, the process moves to step p41a and outputs the memory card address as the first address A.

In step D42, a control code with data length EA and valid/invalid pits rOJ is input.

In step p43, the memory card data is read, and in step p44, it is determined whether the read data and the stored data are the same. If they are the same, the process moves to step p45, and the start address A is set to [E+1. Returning to D20, if they are not the same, the process moves to step p3o and an error is displayed.

According to this second embodiment, if a power supply problem or a problem such as removing the memory card 2 from the contact 1 occurs while recording data to the memory card 2,
The next time you use the memory card 2, after invalidating the data block that caused the problem, you can record new data, and you can continue to use the memory card 2. Since there is no problem even if the card 2 is removed from the contact 1, there is no need for a mechanism that prevents the memory card 2 from being handled during writing.

In the above description, the memory card 2 is used as the recording medium, but the memory card 2 is not limited to the memory card, and may be an IC card with a built-in microcomputer, a magnetic card, a laser card, or the like.

(Effects of the Invention) As described above, according to the present invention, when the first address of fortune-telling is A and the writing pie is 1 to B, writing to the recording medium is performed from address A+B-1 to △18 -2nd address...
・By writing in the order of address A, when you use the recording medium next time after there is a power supply problem while recording data to the recording medium, if you search for the first empty address from address 0, address A will be If there is a memory address that is detected and is not an empty address after address A, it will be detected and any trouble will be detected. Even if a recording medium is damaged from a connector or the like, the next time recording is performed on the recording medium, a one-failure will be discovered and data that cannot be read later will not be recorded.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an information recording device employing the information recording method of the present invention, and FIGS. 2 to 4 are memory maps for explaining a first practical example of the information recording method of the present invention. FIG. 5 is a flowchart for explaining the general processing operation of the first embodiment, FIG. 6 is a flowchart for explaining the detailed processing operation of the first embodiment, and FIG. 7 is a flowchart for explaining the detailed processing operation of the first embodiment. FIG. 8 is a flowchart for explaining the general processing operation of the second embodiment; FIG. 9 is a control code map for explaining the second embodiment of the method;
13 are memory maps for explaining the second embodiment, FIG. 14 is a flowchart for explaining detailed processing operations of the second embodiment, and FIGS. 15 to 18 are conventional information This is a memory map for explaining the recording method. 1...-Contact, 2...Memory card (recording medium)
A), 3...power supply circuit, 4...I10 boat, 5.
...Operation lamp, 6...Error lamp, 7
...Measuring circuit, 8...Microcomputer, 8a
... Recorded data table, 9... Calendar circuit, 1
0...Battery backup circuit. Patent applicant Matsushita Electric Works Co., Ltd. Agent
Patent Attorney Etsuji Kotani Patent Attorney Chief 1) Masayuki Patent Attorney Yasuo Itaya 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 7 Figure 8 Figure 15 Figure 16 Modification ``''NN Ko-\ ＼＼＼＼ Name information 2. Method 3. Relationship with the famous case to be amended Patent applicant name (583) Matsushita Electric Works Co., Ltd. 4. Agent address 1-10-3-6 Nishiki-cho, Nishi-ku, Osaka. Details subject to amendment. ``Detailed Description of the Invention'' section of the book. 7. Contents of amendment (1) I'! Correct the number of bytes B (= 15) J on page 15, line 15 of the IJ specifications to ``Number of bytes B (= 6) +. (3) "Page 15, line 18, number I'A+15" of the specification is amended as "
Heto No. 5,” he corrected.

Claims (1)

[Claims] 1. The write start address is A, and the number of write bytes is B.
In this case, an information recording method is characterized in that writing to a recording medium is performed in the order of addresses A+B-1, A+B-2, . . . , A. 2. When recording data on the recording medium, if a recorded address is detected after an unwritten address, a special code is installed that invalidates both the unwritten address and the recorded address that follows. 2. The information recording method according to claim 1, wherein after recording at an unwritten address, new data is recorded at the next unwritten address.