JPH09179789A - Electronic data storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic data storage device capable of resisting an accident and improved in its reliability. SOLUTION: The upper four digits of a converted hexadecimal value to be data uniquely determined from a traveling distance are stored in a storage area 5a consisting of addresses 00 to OF, a storage area 5b consisting of addresses 10 to 1F and a storage area 5c consisting of addresses 20 to 2F in an EEPROM (non-volatile memory) consisting of 16 addresses × 16 bits and the least significant digit value of the converted hexadecimal data is stored so as to coincide with the lower addresses 0 to F in the addresses 20 to 2F. The storage areas 5a, 5b consisting of the addresses 00 to 0F, 20 to 2F in which the upper digit of each address is even store the upper four digits of data in a state converted by the previously determined combination of low and high potential levels of bits and the storage area 5b consisting of the addresses 10 to 1F in which the upper digit of each address is odd stores the upper four digits of data in the inverted state of conversion based upon the combination as mentioned above.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic data storage device for storing data in address units in a non-volatile memory having a plurality of bits allocated at a plurality of addresses. The present invention relates to an electronic data storage device that can be used, and more particularly, to an electronic data storage device with improved reliability.

[0002]

2. Description of the Related Art Conventionally, when an electronic data storage device of this kind is used as an odometer of a vehicle, for example, even if a battery abnormality (voltage drop, battery removal, etc.) occurs, past travel data is retained. A non-volatile memory is used because it is necessary (Japanese Patent Laid-Open No. 59-196414).
Reference).

[0003]

In such a device, when data is written in or read out from the non-volatile memory, an accident such as a disconnection of a signal line, a short circuit, or noise mixing impairs normal data transfer, resulting in a result. As a result, there is a problem that an accurate value is not displayed when displaying based on data.

Various measures have been studied to deal with such a problem. For example, in Japanese Examined Patent Publication (Kokoku) No. 1-46005, first to third memory areas are prepared in a non-volatile memory, and one data is stored. By simultaneously writing in three memory areas, even if an accident occurs in any one of the memory areas, the majority decision can be taken to read the data from the other two memory areas and prevent the adverse effects of the accident. It is disclosed. However, when an accident occurs in all three memory areas, there is a defect that it cannot be dealt with. It is an object of the present invention to provide an electronic data storage device having a new structure, which is resistant to accidents and has high reliability.

[0005]

SUMMARY OF THE INVENTION The present invention for solving the above problems is an electronic data storage for storing data in the address unit in a non-volatile memory having a plurality of bits allocated by a plurality of addresses. In the device, a method of storing the data is different between the even numbered address and the odd numbered address.

Data is stored in at least three of the storage areas having a plurality of bits allocated by addresses of a nonvolatile memory having 2 × n + 1 (n is an integer of 1 or more) storage areas. In an electronic data storage device that stores at the same time, the storage area is divided into an even storage area and an odd storage area by the address, and the data is previously determined in these storage areas as low and high of the potential of the bit. When the data is converted and stored by the combination, one stores the data in the state converted by the combination, and the other stores the data in the state converted by the combination and in the inverted state.

Further, according to the present invention for solving the above problem, data is stored in the nonvolatile memory having a plurality of bits allocated by m (m is an integer of 2 or more) addresses. In the electronic data storage device, when the data is converted and stored in the even-numbered address and the odd-numbered address by a predetermined combination of low and high of the potential of the bit, one is converted by the combination. In the state, the data is stored, and in the other, the combination is converted and the data is stored in the inverted state.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION E consisting of 16 addresses × 16 bits
A storage area 5a of addresses 00 to 0F of the EPROM 5,
Storage area 5b of address 10 to 1F and address 20
In the storage area 5c of ~ 2F, the upper 4 digits of the value converted to hexadecimal, which is the data uniquely determined from the traveled distance, and the value of the lowest digit of the data converted to hexadecimal, are addresses 00 to 2F. To match lower addresses 0 to F of
The upper 4 digits are converted into the respective storage areas 5a to 5c by a predetermined combination of low and high potentials of the bits and are simultaneously written, and the upper addresses are addresses 00 to 0F, which are even addresses. The storage areas 5a and 5c of 20 to 2F store the upper 4 digits of the data in the state converted by the combination, and the storage area 5b of the addresses 10 to 1F in which the upper address is an odd address.
By converting the above combination and storing the upper 4 digits of the data in the inverted state, it is possible to surely recognize and display to the user an accident that could not be determined by the conventional technique.

EE consisting of 16 addresses × 16 bits
In the storage area 5d of the addresses 0 to F of the PROM 5, the upper 4 digits of the value converted to hexadecimal, which is the data uniquely determined from the traveled distance, and the value of the lowest digit of the data converted to hexadecimal, In order to match the addresses 0 to F, the upper 4 digits are converted by a predetermined combination of low and high potentials of the bits and written simultaneously.
Even addresses 0, 2, 4, 6, 8, A, C and E store the upper 4 digits of the data in the state converted by the combination,
Odd addresses 1, 3, 5, 7, 9, B, D and F are converted by the combination and the upper 4 digits of the data are stored in the inverted state.

[0010]

EXAMPLES The present invention will be described below with reference to the examples shown in FIGS. 1 to 4 relate to the first embodiment, and FIGS. 5 to 8 relate to the second embodiment.

FIG. 1 is a block diagram when the electronic data storage device of the present invention is used as an odometer of a vehicle. The distance sensor 1 which is a distance detecting means and includes an auxiliary circuit such as a waveform shaping circuit is shown in FIG. It is installed on the wheel or axle of the vehicle and outputs a pulse signal in response to running, which is used as a distance input of the microcomputer 2 as a control means. Microcomputer 2
Receives a distance input, counts the number of pulses thereof, and stores the contents stored in the EEPROM 5 serving as a storage unit (traveling distance data into the unit) via decoders 3 and 4 serving as input / output units for each predetermined unit traveling distance (for example, 1 km). The contents are written and read based on 6 digits (for example, 000000 to 999999) via the driver 6 which is a driving means.
Display output to the display unit 7 which is a digital display means of 9) and includes a display element such as a fluorescent display tube is performed by a predetermined method. 8 is a vehicle-mounted battery.

Writing to and reading from the EEPROM 5 and display output to the display 7 will be described with reference to the layout diagram of FIG. 2 and the conversion method diagram of FIG. EEP
The ROM 5 includes a plurality of bits allocated by a plurality of addresses, for example, 16 addresses × 16 bits, a storage area 5a of addresses 00 to 0F, and addresses 10 to 1F.
Storage area 5b and storage areas 5c of addresses 20 to 2F.

The microcomputer 2 converts the latest mileage into a hexadecimal number for each unit mileage, and the EEPROM 5 is a hexadecimal number which is data uniquely determined from the mileage to the addresses 00 to 2F by the decoders 3 and 4. The upper 4 digits of the value converted into the above are stored in the respective storage areas 5a to 5c so that the value of the lowermost digit of the data converted into the hexadecimal number matches the lower addresses 0 to F of the addresses 00 to 2F. The upper 4 digits are converted by a predetermined combination of low and high potentials of the bits and simultaneously written, and each digit of the data is assigned to 4 bits b4 to b1 by the conversion method shown in FIG. 3, for example. Remembered. However, the data storage method is different between an even-numbered address and an odd-numbered address, and for example, among addresses 00 to 2F, addresses 00 to 0, which are even-numbered addresses, are higher.
The storage areas 5a and 5c of F and 20 to 2F store the upper 4 digits of the data in the state of being converted by the combination, and the addresses 10 to 1F in which the upper addresses are odd addresses
The storage area 5b of 4 stores the upper 4 digits of the data in the inverted state after conversion by the combination.

Specifically, the mileage is "123447k
In the case of "m", this traveled distance is converted to hexadecimal "1E2"
37 "as data, and the upper 4 digits of this data," 1E "
23 "by the conversion method shown in FIG.
Allocate to 4 bits of b1 and write to addresses 07 and 27 of storage areas 5a and 5c, respectively. On the other hand, "E1DC", which is the inverted state of "1E23", is written to the address 17 of the storage area 5b in units of 4 bits by the conversion method shown in FIG. Therefore, in the storage areas 5a and 5c, "1E23" is stored at addresses 00-07 and 20-27, and "1E22" is stored at addresses 08-0F and 28-2F (see FIG. 4 (a)). ). In the storage area 5b, "E1DC" is stored at addresses 10 to 17 and "E1DD" is stored at addresses 18 to 1F (see FIG. 4B).

When reading the contents of the EEPROM 5, the latest values in the storage areas 5a and 5c are addresses 07 and 27.
"1E23" and the lower one digit "7" of the address are obtained as hexadecimal data "1E237", and this is converted into a decimal number to obtain "123447". On the other hand, in the storage area 5b, the latest value is "E" at address 17.
"1E23" which is the inverse of "1DC" and "7" in the lower one digit of the address are obtained as hexadecimal data "1E237", and this is converted into a decimal number to obtain "12344".
7 ”. Thus, normally, the latest values obtained from the EEPROM 5 are the same. However, for some reason, the data read from the storage areas 5a to 5c do not match and the number of mismatched bits is a certain number (for example, if one bit error per address is allowed, a certain number = 4). In some cases, recognizing that an accident has occurred, the microcomputer 2 causes the display 7 to display some kind of error (for example, a blank display or a special display that does not normally appear). If the number of mismatched bits of the latest value is less than the predetermined number, it is recognized that there is no accident, the majority value by majority decision is recognized as the latest value of the EEPROM 5, and the mileage "123447 km" is displayed. Display at 7.

In the case of writing or reading data to or from the EEPROM 5, for example, when the terminals are short-circuited during reading, in the conventional technique, the hexadecimal number obtained from all the addresses in the storage areas 5a to 5c becomes "0000" and the number of mismatched bits. Was judged to be 0, the accident was not recognized,
"0000F" was obtained as hexadecimal data from the lower 1 digit "F" of the address and converted to decimal "1".
Mileage "0000" that has nothing to do with the actual latest value
15 km "was displayed on the display 7. However, according to the present embodiment, in the same accident, the storage areas 5a-5
The latest values of c are all "0000", but storage area 5
Since the value of b is the reciprocal “FFFF”, the number of mismatched bits is 16 (in the conversion method of FIG. 3, the hexadecimal number “0”).
Has a 4-bit potential that is "0000", while "F" is "1111", there is a 4-bit difference in each digit. At 16
It is determined that there is a bit difference), and in this case, the microcomputer 2 recognizes that there is an accident without making a majority decision and causes the display unit 7 to display some kind of error. If the number of bits of disagreement is 3 or less, the majority value determined by the majority decision is recognized as the latest value of the EEPROM 5, and this is displayed.
To display.

As described above, it is possible to surely recognize and display to the user an accident that could not be determined by the conventional technique, and accordingly, the user can perform necessary processing in a timely manner, for example, at a service factory. You can receive inspection and maintenance.

In this embodiment, the EEPROM 5 has three
Or more, that is, 2 × n + 1 (n is an integer of 1 or more) storage areas, and a plurality of bits allocated by an address, and each storage area stores at least three data. Any structure may be used as long as it is stored in the area at the same time.

FIG. 5 illustrates the allocation state of the EEPROM 5 in the second embodiment when the electronic data storage device of the present invention is used as a vehicle odometer.
Is an integer of 2 or more), a storage area 5d of addresses 0 to F (EEPRO of the above-described embodiment), which is composed of a plurality of bits allocated by addresses, for example, 16 addresses × 16 bits.
It is composed of the same set of storage areas 5a to 5c of M5) and is converted into a hexadecimal number which is data uniquely determined from the traveling distance, that is, a value obtained by converting the traveling distance into hexadecimal at addresses 0 to F The upper 4 digits of the converted value are converted into hexadecimal numbers so that the lower 4 digits of the data match the addresses 0 to F. The data is converted by a predetermined combination and simultaneously written, and is stored by, for example, the conversion method shown in FIG. However, the data storage method is different between the even addresses and the odd addresses. For example, even addresses 0, 2, 4, 6, 8, A, C,
E stores the upper 4 digits of the data in the state converted by the above combination, and stores the odd addresses 1, 3, 5, 7, 9, B, D,
F stores the upper 4 digits of data in the inverted state after conversion by the combination.

Specifically, the mileage is "123447k
In the case of "m", this traveled distance is converted to hexadecimal "1E2"
37 "as data, and the upper 4 digits of this data," 1E "
23 "is written in the storage area 5d by the conversion method shown in FIG. 3 for each digit of 4 bits. In this embodiment, when writing to an odd address, the microcomputer 2 controls to write in an inverted state. Therefore, "E1DC" which is the inverted state of "1E23" is written in the address 7. Therefore, "0E23" is assigned to addresses 0, 2, 4, and 6, and
“E1DC”, address 8,
"1E22" for A, C, E, address 9, B, D, F
Inverted "E1DD" is stored in (see FIG. 6). That is, the storage contents of each address 0 to F are two types or four types (in the present embodiment, “1E23” and “E1D”).
C ”,“ 1E22 ”, and“ E1DD ”). Based on the stored contents, the microcomputer 2 (see FIG. 1, hereinafter the same) has the driver 6 (see FIG. 1, same below). ), And the display 7 (see FIG. 1, the same applies hereinafter) displays the latest value.

As a reading method, first, "1E23" (addresses 1, 3, 5, 7) and "1E23" in which the stored contents of odd addresses 1, 3, 5, 7, 9, B, D, and F are inverted.
22 ”(address 9, B, D, F). Next, the change point address (address 0
7 to "1E23", addresses 8 to F are "1E22", which is the maximum address with a large stored content, that is, address 7
As the change point address). Then, "1E237" is obtained as hexadecimal data from the stored contents of the change point address (reversed in the case of an odd number address) and the hexadecimal data from the address, and the travel distance "123447km" is converted from "123447" converted to decimal. It is displayed (Fig. 7
reference).

As another method of reading, two addresses are compared from the smallest address to determine whether the stored contents are in the inversion relation, and an address not in the inversion relation is set as a change point address, and this storage is performed. It is also possible to obtain the running distance by obtaining a hexadecimal number from the contents (inversion if the changing point address is an odd number address) and the address of the changing point address and converting this into a decimal number (see FIG. 8).

In such a configuration, if some trouble occurs in the EEPROM 5 and the hexadecimal number obtained from all the addresses in the storage area 5d becomes "0000", in the conventional technique, 16 from the "0000" and the address F. Obtained "0000F" as the data of the decimal number and converted it to decimal number from "15" to the actual mileage "00"
"0015 km" was displayed on the display 7. However, according to the present embodiment, the change point address is not found, and in this case, it is recognized that an accident has occurred and the display 7 displays some error. If the hexadecimal number obtained from all addresses is "FFFF", the occurrence of the accident can be recognized in the same manner.

As described above, it is possible to surely recognize and display to the user an accident that could not be determined by the conventional technique, and accordingly, the user can perform necessary processing in a timely manner, for example, at a service factory. You can receive inspection and maintenance.

In this embodiment, the EEPROM 5 is
Any configuration may be used as long as it has a plurality of bits allocated by (m is an integer of 2 or more) addresses.

The present invention described above is not limited to the odometer of the vehicle described in each of the above-described embodiments, but may be, for example, an integrated time meter for recording the operating time of a machine or the like, or a continuous numerical value recording. It can be applied to a data storage device or the like.

In each of the above embodiments, the lower 1 digit which is a part of the data is associated with the address, and the upper 4 digits which are a part of the data are determined to be low and high of the bits of the EEPROM 5. Although the configuration is such that the data is converted and stored (written) by the combination, all the data may be converted and stored by the combination.

In each of the above embodiments, the data is EEP.
Although the conversion method of FIG. 3 was used when storing (writing) in the ROM 5, the conversion method by a predetermined combination of low and high bits of the EEPROM 5 is not limited to the above-mentioned respective embodiments, and is arbitrarily set. It goes without saying that you can do it.

In each of the above embodiments, the data is
Although the data converted into hexadecimal number was used, the data in decimal number may be so-called BCD (Binary Coded).
Decimal) can be used in the same manner as in each of the above-described embodiments even in a configuration in which conversion is performed by a predetermined combination of bit low and high and the data is stored in the EEPROM 5.

[0030]

According to the present invention, in an electronic data storage device for storing data in the nonvolatile memory having a plurality of bits allocated by a plurality of addresses in units of the addresses, the even addresses and the odd addresses are stored. The method of storing the above data differs depending on the address, and it has the effect of reliably recognizing an accident that could not be determined by conventional technology and displaying it to the user. It is possible to provide an electronic data storage device having improved performance.

Data is stored in at least three of the storage areas having a plurality of bits allocated by addresses of a nonvolatile memory having 2 × n + 1 (n is an integer of 1 or more) storage areas. In an electronic data storage device that stores at the same time, the storage area is divided into an even storage area and an odd storage area by the address, and the data is previously determined in these storage areas as low and high of the potential of the bit. When the data is converted and stored by the specified combination, one stores the data in the state converted by the combination, and the other stores the data in the state converted by the combination and the inverted state thereof. It has the effect of reliably recognizing an accident that could not be performed and displaying it to the user. It is possible to provide an electronic data storage device.

In the present invention, m (m is an integer of 2 or more)
In an electronic data storage device for storing data in the address unit in a non-volatile memory having a plurality of bits allocated by individual addresses, the data of the potential of the bits is stored in the even addresses and the odd addresses. When converting and storing by a predetermined combination of low and high, one stores the data in a state converted by the combination, and the other stores the data in a state converted by the combination and the inverted state thereof. The present invention has the effect of reliably recognizing and displaying to the user an accident that could not be determined by the conventional technology, and provides an electronic data storage device that is resistant to accidents and has improved reliability. be able to.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a first embodiment of the present invention.

FIG. 2 is an allocation diagram illustrating a configuration of an EEPROM according to the embodiment.

FIG. 3 is an explanatory diagram illustrating data conversion in the above embodiment.

FIG. 4 is an allocation diagram for explaining a concrete storage state of the EEPROM in the embodiment.

FIG. 5 is an allocation diagram illustrating a configuration of an EEPROM according to a second embodiment of the present invention.

FIG. 6 is an allocation diagram for explaining a concrete storage state of the EEPROM in the embodiment.

FIG. 7 is an explanatory diagram illustrating a change point address in the above embodiment.

FIG. 8 is an explanatory diagram illustrating a change point address in the above embodiment.

[Explanation of symbols]

 5 EEPROM (nonvolatile memory) 5a, 5b, 5c, 5d storage area

Claims (3)

[Claims] 1. An electronic data storage device for storing data in a unit of an address in a non-volatile memory having a plurality of bits allocated by a plurality of addresses, wherein an even number of the addresses and an odd number of the addresses are used. An electronic data storage device characterized by different data storage methods. 2. Storage of at least three data in each storage area having a plurality of bits allocated at an address of a non-volatile memory having 2 × n + 1 (n is an integer of 1 or more) storage areas. In an electronic data storage device for simultaneously storing in an area, the storage area is divided into an even storage area and an odd storage area by the address, and the data is stored in these storage areas as low and high potentials of the bit. When converting and storing by a predetermined combination, one stores data in a state converted by the combination, and the other stores data by converting in the combination and stores the data in an inverted state thereof. Data storage device. 3. An even-numbered address in an electronic data storage device for storing data in said address unit in a nonvolatile memory having a plurality of bits allocated by m (m is an integer of 2 or more) addresses. And when storing the data in the odd-numbered address by converting the data by a predetermined combination of low and high of the potential of the bit, one stores the data in a state converted by the combination, and the other stores the data. An electronic data storage device, characterized in that the data is stored in a state of being converted by a combination and being inverted.