JPH06332805A - Electronic equipment - Google Patents

Abstract

PURPOSE:To automatically restore data even when the data for controlling an electronic equipment are damaged by static electricity and noise, etc., by distributing the data required for the control of a system in a RAM, storing plural pairs and checking the data in a specified cycle. CONSTITUTION:A control circuit 2 reads the standard data required for the control of respective parts from a program memory 3 and distributes and stores the same data to three areas, the areas 4B, 4D and 4F of a data memory 4 to be stored. The control circuit 2 checks the data of the areas of the data memory 4 in a prescribed cycle, compares the data of the areas 4B and 4D when a checking mode is started and compares the data of the areas 4B and 4F successively at the time of coincidence. Then, at the time of non-coincidence, since the data of the area 4F are erroneous, the control circuit 2 transfers the data of the area 4B to the area 4F, reloads the data of the area 4F and restores the erroneous data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device for setting data in a memory.

[0002]

2. Description of the Related Art In recent electronic devices, a user can set environmental conditions or operating conditions of the device, the set data is stored in a memory, and the control device is based on the data stored in the memory. Is configured to control. Since these data are extremely important for control, a method of using a shield plate or a magnetic component such as a coil or a core to prevent the data from being destroyed by static electricity or noise is adopted.

[0003]

Although it is possible to prevent the data from being destroyed to some extent by the above measures, it is impossible to completely prevent the data from being destroyed, and improvements have been demanded.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a ROM storing standard control data and a RAM storing a plurality of sets of conditionally set identical data in a distributed manner. And a means for detecting a match by comparing the data of the data sets stored in the RAM, a means for rewriting the data of another normal set when the data of one set do not match, and a case where the data of all the sets do not match. The standard data is transferred from the ROM to the RAM, and at the same time, it is configured to control so as to notify the occurrence of an error.

[0005]

Since the present invention is configured as described above, even if the data for controlling the electronic equipment is destroyed by static electricity, noise, etc., the data can be automatically restored.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of an electronic cash register embodying the present invention. (1) is a numeric keypad for registering a number, a department key,
A keyboard composed of transaction keys and responsible keys.
(2) is a ROM in which a processing program is stored in advance, based on the amount data etc. input from the keyboard (1)
A control circuit for performing a processing operation according to a program in the program memory (3), which is composed of a microprocessor. (4) is the initial setting operation, from the program memory (3), from the RAM that stores the memory allocation for controlling the system, data such as interface information with peripheral devices, and the data processed by the control circuit (2). In the data memory, the control circuit (2) controls the writing and reading of data. The data memory (4) is configured to store the same data for controlling the system in three areas (4B) (4D) (4F) in a distributed manner as shown in FIG. (5) is the numerical data and control circuit (2) input from the keyboard (1)
It is a display for displaying the data processed by the above, and is connected to the control circuit (2). (6) is a printer which prints the numerical data input from the keyboard (1) and the data processed by the control circuit (2) under the control of the control circuit (2). It is configured.

Next, the operation of the present invention having such a configuration will be described.

Prior to use, when an electronic cash register is installed and is initialized by power-on, the control circuit (2) reads standard data necessary for controlling each section from the program memory (3), Data memory (4)
The same data is distributed and stored in the three areas (4B), (4D), and (4F). Then, when the condition data to be set is input by performing a predetermined key operation on the keyboard (1) to set the condition according to the situation of the store where the electronic cash register is installed, the control circuit (2) causes the data memory (4 The standard data stored in the areas (4B), (4D) and (4F) of () are rewritten with the input condition data to change the condition setting. As a result, it is possible to set the operating environment of the system, such as memory allocation and interface with peripheral devices, to an optimum state corresponding to the store.

After the condition setting is completed in this way, when the customer registers the sales of the purchased product from the keyboard (1), the control circuit (2) divides the sales data into departments or products. The data is written in a predetermined area of the data memory (4) and the printer (6) is controlled to print on the receipt and the journal. Upon completion of sales registration, the control circuit (2) obtains the total amount, issues a receipt, and finishes the process for one customer. These operations are general operations of the electronic cash register, and a detailed description thereof will be omitted. However, for this operation control, the data stored in the area (4B) of the data memory (4) is controlled by the control circuit. (2) is appropriately used.

Next, the data memory (4) which is the feature of the present application
The check operation of the data stored in the areas (4B), (4D) and (4F) and the recovery operation in case of data destruction will be described.

The control circuit (2) has data (1) in the areas (4B) (4D) (4F) of the data memory (4) at a predetermined cycle.
~ Data (3) is checked, and when the check mode is entered, the control circuit (2) compares the data (1) and the data (2) in the area (4B) and the area (4D) in step (S1). If it is determined that they match in step (S2), the process proceeds to step (S3) and the area (4B)
And the data (1) and the data (3) in the area (4F) are compared, and when it is determined that they match in step (S4), that is, all the data in the areas (4B) (4D) (4F) If it is determined that the operation has been performed, the process proceeds to the normal electronic cash register process of step (S5) without doing anything. However, if it is detected in step (S4) that they do not match, the control circuit (2) proceeds to step (S6) because the data (3) in the area (4F) is incorrect. Data in the area (4F) is rewritten, and the data in the area (4F) is rewritten to recover erroneous data in the area (4F).

On the other hand, when it is determined in step (S2) that the area (4B) and the area (4D) do not match, the control circuit (2) proceeds to step (S7).
B) and the data in the area (4F) are compared, and if a match is detected in step (S8), it means that the data (2) in the area (4D) is erroneous, so step (S9).
Proceed to and transfer the data in area (4B) to area (4D),
The data in the area (4D) is rewritten, and the area (4D) is rewritten.
Measure the recovery of incorrect data. On the other hand, if a mismatch is detected in the determination in step (S8), the control circuit (2) proceeds to step (S10), and the area (4D) and the area (4D
The data of F) are compared. The control circuit (2), which has detected in step (S11) that they match as a result of comparison,
It is determined that the data in the area (4B) is incorrect, and the process proceeds to step (S12), and the data in the area (4D) is changed to the area (4B).
The data in the area (4B) is rewritten and the erroneous data in the area (4B) is restored.

On the other hand, when a discrepancy is detected in the judgment of the step (S11), the control circuit (2) causes the areas (4B) (4)
D) It is determined that all the data in (4F) are different, the process proceeds to step (S13), the standard data is read from the program memory (3), and the area (4) of the data memory (4) is read.
B) (4D) (4F) After writing, step (S1
In step 4), an error flag is set, and then in step S15, error processing such as ringing of a buzzer or lighting of an error lamp is performed. If an error occurs,
As described above, the condition setting is performed again from the beginning.

Although the embodiment is the case of the electronic cash register, the present invention is not limited to this and can be applied to other electronic devices.

[0015]

As described above, in the electronic device of the present invention, a plurality of sets of data necessary for controlling the system are dispersed and stored in the RAM, the data is checked at a predetermined cycle, and if there is an error, normal data is obtained. Since it is configured to automatically restore data by rewriting, even if an error occurs in part of the RAM data due to static electricity, noise, etc., it can be automatically restored, so an error will occur in the data as before. There is an effect that problems such as performing erroneous processing without being aware of what has been done are solved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an electronic device of the invention.

FIG. 2 is a schematic diagram showing the configuration of the data memory of FIG.

FIG. 3 is a flowchart showing an operating state of the control circuit of FIG.

FIG. 4 is a flowchart showing an operation state of the control circuit of FIG.

[Explanation of symbols]

 1 Keyboard 2 Control Circuit 4 Data Memory 5 Display 6 Printer

Claims (1)

[Claims] 1. A ROM storing standard control data,
R in which multiple sets of conditionally set identical data are distributed and stored
A method of comparing the data of the data sets stored in the RAM and the RAM to detect a match, a method of rewriting the data of another normal set when one set of data does not match, and a data of all the sets of mismatch. In this case, the electronic device is characterized in that it is constituted by means for controlling the standard data to be transferred from the ROM to the RAM and notifying the occurrence of an error.