JPH064410A - Electronic apparatus - Google Patents

Abstract

PURPOSE:To quicken a response, and also, to prevent deterioration of a service life of an EEPROM by rewriting data of the EEPROM, only when data of a RAM is different from the contents of the EEPROM. CONSTITUTION:When a data registration mode is set by a prescribed key operation of a keyboard 8, a controller 1 which detects a key signal starts a processing of the data registration mode. Subsequently, when a data input for instructing an operation mode to be set is executed, the input data is written in an M2 area of a work memory 7 constituted of a dynamic RAM. The controller 1 which detects the end of the data input compares the data of the M1 and the M2 areas of the work memory 7, and as a result, whether the data of the M1 and the M2 areas coincide with each other or not, is decided, and when they coincide with each other, the processing is advanced to the next processing, and in the case they do not coincide with each other, it is decided that data of a retaining memory 6 constituted of an EEPROM is changed, the data of the M2 area of the work memory 7 is written in the retaining memory 6, and thereafter, the processing is advanced to the next processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device capable of storing various data such as operation mode data or dial number data.

[0002]

2. Description of the Related Art In recent electronic devices such as facsimile machines and telephones, the operation mode of the device is selected in advance and stored in a memory, data is read from the memory when the device is operating, and the data is read based on the read data. It is configured to set an operation mode and operate. Further, in an electronic device having a telephone function, telephone number data of a plurality of destinations are stored in advance in a memory together with an abbreviated number or a one-touch key, and when a dial call is made, the abbreviated number is input or the one-touch key is operated. The telephone number data is read from the memory and dialed.

Since it is necessary to retain the data in the memory even when the power is cut off, a method of backing up the memory with a battery or a method of configuring the memory with an EEPROM that does not require battery backup has been conventionally used. ing.

[0004]

However, the above-mentioned battery backup method has a problem that a battery and a backup circuit are required, resulting in an increase in cost.
On the other hand, when the EEPROM is used, the battery and the backup circuit are unnecessary, but the EEPROM requires a time of several msec for writing, so that the response to the input of write data is slow and the number of times of writing is constant due to the configuration. However, there is a problem that the life of the EEPROM is shortened if a useless write operation is performed due to a key input error or the like when inputting write data.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an EEPROM and an EEPROM are provided.
RAM with the same capacity as M, EEPROM and RAM
It comprises a control device for controlling reading and writing to and from the RAM, and is configured to normally read and write data to and from the RAM and write the data to the EEPROM only when the data in the RAM is changed.

[0006]

Since the present invention is configured as described above, since normal data reading / writing is performed on the RAM having a high access speed, the operator does not have to worry about the delay in inputting the data, and the EEPROM is also provided. Data is written into the memory only when there is a change in the data, and since unnecessary writing operation is not performed, it is possible to prevent the life of the EEPROM from being shortened.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below taking a facsimile machine as an example.

(1) is a control device for controlling the entire facsimile apparatus, which is composed of a microprocessor and controls each section according to a program in a program memory (2) in which a processing program is stored. Further, the control device (1) performs signal processing of the read transmission original data and processing of the received signal, and also generates various control signals. A reading unit (3) optically reads a transmission original, converts the read black and white data into an electric signal, and supplies the electric signal to the control device (1). A recording unit (4) drives a recording head such as a thermal head to perform printing under the control of the control device (1) based on a received signal. Reference numeral (5) is a data memory for storing the original data read by the reading unit (3) or the signal-processed data, and the writing and reading of the data are controlled by the control device (1).
Reference numeral (6) is a storage memory for storing the operation mode data of the facsimile apparatus and the name and telephone number data of the communication partner, which is composed of an EEPROM, and the writing and reading of the data are controlled by the control unit (1). (7)
Is a working memory to which the contents of the storage memory (6) are transferred,
It has twice the capacity of the storage memory (6), and the same data is transferred from the storage memory (6) to the M1 and M2 areas. The data memory (5) and the working memory (7) are composed of dynamic RAM, and the stored contents are lost when the power is cut off, but the storage memory (6) is an EEPROM.
The memory contents are not lost even if the power is cut off.

Reference numeral (8) is a keyboard composed of a communication key, a mode key, a ten-key pad, etc. The control device (1) which receives the key signal controls according to the program of the program memory (2) according to the key signal. (9) is a display device for displaying data input from the keyboard (8) or data read from the working memory (7). (1
0) is a modem circuit that modulates a signal transmitted to the telephone line (L) and demodulates a signal received from the telephone line (L).
Reference numeral (11) is a line switching circuit for switching and connecting the telephone (12) and the modem circuit (10) to the telephone line (L), which is composed of a relay circuit and is switch-controlled by the control device (1). Reference numeral (13) is a dial signal generation circuit for automatically generating a dial signal based on the dial number data transmitted from the control device (1). The dial signal is sent through the line switching circuit (11) to the telephone line (L). Send to.

Next, the operation of the present invention having such a configuration will be described with reference to the flow charts of FIGS.

First, in the facsimile apparatus, the user is allowed to select various operation modes such as the document density, the number of incoming bells, or the automatic switching mode according to the usage condition, and the standard mode is used in the manufacturing process of the factory. Is set. That is, when the data registration mode is set by a predetermined key operation of the keyboard (8), the control device (1) which has detected the key signal starts the processing of the data registration mode shown in FIG. Then, when data is input to instruct the operation mode set in step (S1), step (S2)
Proceed to and write the input data in the M2 area of the working memory (7). Steps (S1) to (S
When the control device (1) detects that the data input is completed in step (S3) by repeating the process of 3), the control device (1) proceeds to step (S4) and compares the data in the M1 and M2 areas of the working memory (7). Then, in step (S5), it is determined whether or not the data in the areas M1 and M2 match as a result of the comparison. If they match, the process proceeds to the next process. If they do not match, the storage memory (6) It is determined that the data has been changed, the process proceeds to step (S6), the data in the M2 area of the working memory (7) is written in the storage memory (6), and then the process proceeds to the next process. In this case, the setting is made in the manufacturing process of the factory, and the data is not written in the M1 area of the working memory (7). Therefore, in the comparison of step (S4), M1 and M2 are compared.
Since the data in the area is different, the control device (1) proceeds to step (S6) to transfer and write the data in the M2 area of the working memory (7) to the storage memory (6). When the manufacturing process is finished and the power is cut off, the data in the working memory (7) is lost, but the storage memory (6) is composed of the EEPROM and the written data is stored. The operation mode data of the standard mode set in the manufacturing process is stored.

Next, when the facsimile device is installed at the user's place and the power is turned on, the control device (1) starts the processing shown in FIG. First, the data in the storage memory (6) is read in step (S10), and then in step (S1).
The data read in 1) is transferred and written in both the M1 area and the M2 area of the working memory (7). As a result, the same data is written in the M1 and M2 areas of the working memory (7),
The standard operation mode data is written.

In this state, the facsimile device becomes usable, and the control device (1) accesses the M2 area of the working memory (7) at the time of transmission and reception, and performs operation control based on the operation mode data set therein. . At this time, the control device (1) does not access the storage memory (6).

Next, the operation in which the user registers in advance telephone number data that is frequently used will be described.

First, when the data registration mode is set in the same manner as described above by operating a predetermined key on the keyboard (8), the control device (1) starts the processing of FIG. Then step (S
When the telephone number data is inputted together with the abbreviated number in 1) or the inputted telephone number data is inputted together with the one-touch key, the control unit (1) makes the telephone inputted in the M2 area of the working memory (7) in step (S2). Write the number data. Since the working memory (7) is composed of the dynamic RAM and the writing time is very short, the operator does not feel that the response from the input of data to the end of writing is slow. Similarly, when the writing of a plurality of desired telephone numbers is completed, the control device (1) which has detected the completion in step (S3), the working memory (7) in step (S4).
The data in the M1 and M2 areas are compared, but the telephone number data is stored in the M2 area. However, since the telephone number data is not written in the M1 area, the data in the M1 and M2 areas are different. , The control device (1) is step (S6)
After transferring the data in the M2 area to the storage memory (6) and writing the data, the data registration mode is terminated and the process proceeds to the next step.
As a result, the telephone number data is written in the storage memory (6) and the data is updated.

Next, the operation of dialing based on the registered telephone number data will be described.

First, the off-hook key of the keyboard (8) is operated to control the line switching circuit (11) to control the telephone line (L).
After connecting the line to the modem circuit (10) side to make a line connection, when the abbreviated number is input with the keyboard (8) or the one-touch key is operated, the control device (1) that detects the key signal causes the working memory ( The corresponding telephone number data is read from the M2 area of 7), and the dial signal generation circuit (13)
To the telephone line (L) via the line switching circuit (11). If the other party responds to the dial call, it is possible to send or call.
The work memory (7) is accessed during dialing as described above, and the storage memory (6) is not accessed.

At this time, the telephone number data is not written in the working memory (7), but if the power is once cut off for some reason and then turned on again, the same operation as described above is performed. 3 is performed, and the same data is written in the storage memory (6) in both the M1 and M2 areas of the working memory (7), so the telephone number data is also written in the M1 area.

[0019]

As described above, in the electronic device of the present invention, data that should not be lost is written and stored in the EEPROM of the storage memory, and a work RAM for transferring the contents of the EEPROM is provided. Read and write data by access, RAM data is EEPROM
By rewriting the EEPROM data only when the contents are different from the above, the response when the user inputs data is quickened and the number of writing to the EEPROM is suppressed to the minimum to prevent the life of the EEPROM from being shortened. This is a very practical effect.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing an operation state of FIG.

FIG. 3 is a flowchart showing an operation state of FIG.

[Explanation of symbols]

 1 Control Device 3 Reader 4 Recorder 5 Data Memory 6 Storage Memory 7 Working Memory

Claims (1)

[Claims] 1. An EEPROM for storing and holding data,
It comprises a RAM having the same capacity as the ROM, and an EEPROM and a control device for controlling reading and writing from and to the RAM. The control device transfers the data of the EEPROM to the RAM, and normal reading and writing of data is performed to and from the RAM. An electronic device characterized in that it is controlled so that the RAM data is transferred to the EEPROM and written only when the RAM data is changed.