JP2006079262A - Eeprom control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the shipping initialization of an EEPROM unnecessary, improve productivity, extend the life of the EEPROM by reducing the number of writing times to an EEPROM and efficiently use the region of the EEPROM in an application system such as a home electrical appliance equipped with the EEPROM which stores a setting value for controlling the system. <P>SOLUTION: The EEPROM control system is provided with; the EEPROM which stores a setting value for controlling a system; a control part which reads out the setting value stored in the EEPROM and controls the system; a determination part which determines whether data stored in the EEPROM are normal based on the data stored in a prescribed address of the EEPROM; and a ROM which stores a default value of the setting value for controlling the system. When the determination part determines that the data stored in the EEPROM are abnormal, controlling is made based on the default value stored in the ROM, or the default value stored in the ROM is written to the EEPROM. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an EEPROM control system.

The EEPROM is incorporated in an application system such as a home appliance and stores setting values for controlling the system. Conventionally, this type of EEPROM control system determines whether or not to initialize the EEPROM based on whether or not a specific key operation is performed (see, for example, Patent Document 1). FIG. 3 shows a conventional EEPROM control system described in Patent Document 1. In FIG. As shown in FIG. 3, the configuration includes an EEPROM 1, a microcomputer 10, and a key input unit 6.
JP-A-8-46885

  However, in the conventional configuration, normal data is not stored in the EEPROM at the time of factory shipment or when it is replaced with a new one. Therefore, in order to operate the EEPROM control system normally, a specific key operation is performed. It is necessary to initialize the EEPROM.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an EEPROM control system that solves the above-described conventional problems and eliminates the need for initialization at the time of shipment and improves productivity.

  In order to solve the above-described conventional problems, an EEPROM control system according to the present invention includes an EEPROM that stores setting values for controlling the system, and a control unit that reads the setting values stored in the EEPROM and controls the system. And a determination unit for determining whether or not the data stored in the EEPROM is normal based on the data stored at a predetermined address of the EEPROM, and a ROM for storing a default value of a set value for controlling the system. When it is determined that the data stored in the EEPROM is abnormal, control is performed using the default value stored in the ROM, or the default value stored in the ROM is written into the EEPROM, so that Initialization is not required and productivity is improved. Further, in a system that includes a RAM for storing data read from the EEPROM and controls the RAM while referring to the data in the RAM, when the determination unit determines that the data stored in the EEPROM is abnormal, the data is stored in the ROM. By transferring the default value to the RAM, the number of times of writing to the EEPROM can be reduced and the life of the EEPROM is extended. In addition, “0” data and “1” data are written to 2 bits of a predetermined address of the EEPROM, and by determining that the data stored in the EEPROM is abnormal based on the data, “00”, “FF”, etc. Even if the value is indefinite, it is possible to reliably determine an abnormality, and an area other than 2 bits can be used as a setting value storage area for controlling the system, and the EEPROM area can be used effectively. it can.

  The EEPROM control system of the present invention eliminates the need for initialization at the time of shipment for application systems such as home appliances, improves productivity, extends the lifetime of the EEPROM by reducing the number of times the EEPROM is written, The area can be used effectively.

  1st invention, EEPROM which memorize | stores the setting value for controlling a system, The control part which reads the setting value memorize | stored in EEPROM, and controls a system, Whether the data memorize | stored in EEPROM are normal A determination unit is provided for determining whether or not the data stored in the EEPROM is normal based on the data stored at a predetermined address of the EEPROM.

  In the second invention, in particular, in the EEPROM control system of the first invention, "0" data and "1" data are written in 2 bits of a predetermined address of the EEPROM, and the data stored in the EEPROM is abnormal due to the data. Therefore, even if the value is indefinite, such as “00” or “FF”, it is possible to reliably determine the abnormality, and the area other than 2 bits is used as a setting value storage area for controlling the system. The EEPROM area can be used effectively.

  The third invention, in particular, in the EEPROM control system of the first or second invention, is provided with a ROM for storing a default value of a set value for controlling the system, and the data stored in the EEPROM by the determination unit is abnormal. In the case where it is determined that the data is determined as follows, it is possible to prevent the system from operating with abnormal data by performing control based on the default value stored in the ROM.

  In the fourth aspect of the invention, in particular, in the EEPROM control system of the third aspect of the invention, when the determination unit determines that the data stored in the EEPROM is abnormal, the default value stored in the ROM is written to the EEPROM. As a result, initialization at the time of shipment is unnecessary, and productivity can be improved.

  The fifth aspect of the invention includes a RAM for storing data read from the EEPROM, particularly in the EEPROM control system of the third aspect of the invention, and when the data stored in the EEPROM is determined to be abnormal by the determination unit, the ROM By transferring the default value stored in the RAM to the RAM and controlling the RAM while referring to the RAM data, the number of times of writing to the EEPROM can be reduced, the life of the EEPROM is extended, and the process of writing the default value to the EEPROM is reduced. It becomes unnecessary and the program capacity can be reduced. Further, initialization at the time of shipment is unnecessary, and productivity can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a block diagram of an EEPROM control system according to the first embodiment of the present invention. In FIG. 1, a microcomputer 10 controls a control unit 2 that reads a set value stored in the EEPROM 1 and controls the system, a determination unit 3 that determines whether data stored in the EEPROM 1 is normal, and a system. This is composed of a ROM 4 that stores default values for setting values and a RAM 5 that stores data read from the EEPROM 1, and transmits and receives data via the serial interface and the like. The EEPROM control system configured as described above will be described below with reference to the flowchart of FIG.

First, when the power is turned on, the setting value for controlling the system is read from the EEPROM 1 by the control unit 2 (S101), and the data read from the EEPROM 1 is transferred to the RAM 5 (S102). Next, the determination unit 3 compares whether the lower 2 bits of the data stored in the address 0000H of the EEPROM 1 is “10” (S103). If the data is “10”, it is determined to be normal, and the process proceeds to S105. If the data is not “10”, it is determined that there is an abnormality, and a default value of a setting value for controlling the system is transferred from the ROM 4 to the RAM 5 (S104). At this time, “10” is transferred to the lower 2 bits of the RAM corresponding to the address 0000H of the EEPROM 1. If the setting value for controlling the system is changed (S105), the data in the RAM 5 is changed and the data is written to the EEPROM 1 (S106). As a result, the lower 2 bits of data at the address 0000H of the EEPROM 1 are rewritten to “10”. When the power is next turned on, it is determined that the data is normal in S103, and the contents changed in S106 are reflected.

  As described above, in the present embodiment, an EEPROM that stores setting values for controlling the system, a control unit that reads the setting values stored in the EEPROM and controls the system, and a predetermined address of the EEPROM The data stored in the EEPROM includes a determination unit that determines whether the data stored in the EEPROM is normal and a ROM that stores a default value of a setting value for controlling the system. Is determined to be abnormal, control is performed using the default value stored in the ROM, so that initialization at the time of shipment is unnecessary, and productivity is improved. Further, in a system that includes a RAM for storing data read from the EEPROM and controls the RAM while referring to the data in the RAM, when the determination unit determines that the data stored in the EEPROM is abnormal, the data is stored in the ROM. By transferring the default value to the RAM, the number of times of writing to the EEPROM can be reduced and the life of the EEPROM is extended. In addition, “0” data and “1” data are written to 2 bits of a predetermined address of the EEPROM, and by determining that the data stored in the EEPROM is abnormal based on the data, “00”, “FF”, etc. Even if the value is indefinite, it is possible to reliably determine an abnormality, and an area other than 2 bits can be used as a setting value storage area for controlling the system, and the EEPROM area can be used effectively. it can.

  As described above, the EEPROM control system according to the present invention eliminates the need for initialization at the time of shipment, improves productivity, extends the life of the EEPROM by reducing the number of times of writing to the EEPROM, and makes the EEPROM area effective. Since it can be used, it can be applied to applications such as home appliances such as AV equipment such as TV and video, and air conditioners.

The block diagram of the EEPROM control system in Embodiment 1 of this invention The flowchart which shows operation | movement of the EEPROM control system in Embodiment 1 of this invention. Block diagram of a conventional EEPROM control system

Explanation of symbols

1 EEPROM
2 Control unit 3 Judgment unit 4 ROM
5 RAM
6 Key input part 10 Microcomputer

Claims (5)

An EEPROM that stores setting values for controlling the system, a control unit that reads the setting values stored in the EEPROM and controls the system, and data stored in a predetermined address of the EEPROM is stored in the EEPROM. EEPROM control system comprising a determination unit for determining whether or not the received data is normal. 2. The EEPROM control system according to claim 1, wherein "0" data and "1" data are written in 2 bits of a predetermined address of the EEPROM. A ROM for storing a default value of a set value for controlling the system is provided, and when the determination unit determines that the data stored in the EEPROM is abnormal, the control is performed using the default value stored in the ROM. Item 3. The EEPROM control system according to Item 1 or 2. 4. The EEPROM control system according to claim 3, wherein when the data stored in the EEPROM is determined to be abnormal by the determination unit, the default value stored in the ROM is written to the EEPROM. 4. The RAM according to claim 3, further comprising a RAM for storing data read from the EEPROM, wherein when the determination unit determines that the data stored in the EEPROM is abnormal, the default value stored in the ROM is transferred to the RAM. EEPROM control system.

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