JPH0973335A - Data processing device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a data processing device that reliably stores return information and does not malfunction. SOLUTION: A plurality of status information indicating various operating states at the present time when a processing interruption condition is satisfied is stored in a predetermined area, and before the processing interruption based on the plurality of status information stored in the predetermined area at the time of returning from the processing. A data processing device 1 that reproduces a state, in which the information storage unit 2 having a plurality of storage blocks for storing status information and the same writing of status information in each storage block of the information storage unit 2 are performed. Storage controller 3 for storing by
When the process returns, the status information stored in each storage block in the information storage unit 2 is read,
An information selecting unit 4 that selects a majority of the read status information, and a return operation determining unit 5 that determines an operation at the time of processing recovery based on the status information selected by the information selecting unit 4. To be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention stores various status information in a data storage device at the time of interruption or termination of data processing work in a data processing device or a power failure, and performs data processing based on the stored various status information. The present invention relates to the field of data processing devices that restore the previous operating state upon restoration.

[0002]

2. Description of the Related Art In recent years, for example, in a data processing device such as a portable personal computer, when a temporary processing is interrupted during a data processing operation and the processing is started again, the operation can be performed in the state of the interruption. Generally, a so-called resume function is provided. Also, if the power supply voltage supplied to the data processing device falls below the operation guarantee value due to a power failure, etc., a drop in the power supply voltage is detected,
There is also provided one having a function of immediately storing various information used in the current data processing work.

In the above data processing device, in order to guarantee the operation before the data processing is interrupted or before the power failure is detected when the data processing is interrupted or the power failure is detected, for example, it is necessary for the re-operation of the operation mode and the address information. This information is used as status flag information in the EEPROM (Electrically Erasa
ble Programmable Read Only Memory). The EEPROM is an electrically programmable ROM, which is a semiconductor memory in which data can be erased and rewritten. Therefore, the written data can be held even if the power is not supplied due to a power failure or the like.

The operation mode storing and restoring operations will be described below with reference to FIGS. 5 and 6 are diagrams for explaining an operation example of a conventional example, and FIG. 5 is a schematic diagram of a memory map of an EEPROM serving as an information storage area.
6 is a flowchart showing an operation mode determination example at the time of operation recovery. The operation modes of the data processing device in FIGS. 5 and 6 are roughly divided into two operation modes, “00H” in mode 0 (“0000 0000B” in binary) and “01H” (2 in mode 1). "0000 0001B" in decimal)
Is stored at a predetermined address on the EEPROM. The processing step in FIG. 6 is indicated by S.

First, "0" is stored in a predetermined address of the EEPROM.
Since "0H" has been written, the data processing device operates in mode 0. At that time, if the data processing is interrupted or a power failure occurs, the state is maintained. Then, when the data processing device is started up after the interruption of the data processing is resumed or after the power is restored, as shown in FIG. 6, the value of the operation mode stored in the predetermined address in the EEPROM which is the storage area of the operation mode information. Is read, and it is checked whether or not the operation mode before interruption or before power failure is mode 0, that is, whether or not the read value is "00H" (S1).

Based on the judgment processing in step S1 above,
If the read value is "00H", it is determined that the operation mode before interruption or before power failure is mode 0 (S2),
On the other hand, if "01H", it is determined that the operation mode before interruption or before power failure is mode 1 (S3). And
By constructing the environment based on the determined operation mode, the operation state before the data processing interruption or before the power failure detection is restored.

[0007]

However, in such a conventional data processing apparatus, when the status flag information (hereinafter referred to as return information) before data processing interruption or before power failure detection is stored in the EEPROM, Since it was common to handle status flag information in bit units in order to keep memory consumption low, it may cause a malfunction when the information value to be stored changes for some reason when writing information. There was a problem.

That is, as shown in FIG.
"08H" is supposed to be written as "0H"
When the operation mode is determined according to the restoration procedure shown in FIG. 6 when written as (0000 1000B in binary), the operation mode may be erroneously determined to be mode 1 in the determination process of step S1. become. Therefore, there is a problem that the result of this determination may cause a malfunction or, in the worst case, cause a hang-up in relation to other motion information.

An object of the present invention is to solve the above-mentioned problems, provide a data processing device that surely stores return information, and has no malfunction.

[0010]

A data processing apparatus of the present invention stores a plurality of status information indicating various operating states at the present time in a predetermined area when a processing interruption condition is satisfied,
A data processing device that reproduces a state before a process is interrupted based on a plurality of status information stored in the predetermined area at the time of process recovery, and an information storage unit having a plurality of storage blocks for storing the status information, The storage control unit that stores the status information by writing the same information to each storage block of the information storage unit, and the status information stored in each storage block of the information storage unit when the process returns. An information selection unit that selects the status information that is read out and becomes a majority of the read status information, and a restoration operation determination unit that determines the operation at the time of processing restoration based on the status information selected by the information selection unit. , Are provided.

In this case, as described in claim 2, the information selecting section may have an information restoring section for copying the status information selected by the information selecting section to a storage block for storing status information other than the selected status information. Desirably, as described in claim 3, the status information is defined by a specified value having a plurality of bit lengths, and values indicating various states in the status information are different in at least half or more bit values. It is valid.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a data processing device of the present invention. The data processing device 1 of the present invention is roughly classified into an information storage unit 2 including a writable nonvolatile semiconductor memory such as an EEPROM, and a storage control unit that writes status information to each storage block in the information storage unit 2. 3, an information selecting unit 4 for selecting status information used at the time of returning from the processing from each storage block in the information storing unit 2, and an operation state at the time of returning to the processing is determined based on the status information selected by the information selecting unit 4. The recovery operation determination unit 5 and the information restoration unit 6 that copies correct status information into a storage block that stores information different from the status information selected by the information selection unit 4 are included.

The information storage unit 2 has a plurality of storage blocks (in this example, three blocks of a first block, a second block, and a third block), and each storage block stores status information. It Each storage block corresponds to an information storage area in the conventional example. The storage control unit 3 performs control for writing the current status information to the storage block when detecting interruption of data processing or power failure. Specifically, first, the storage control unit 3 first writes the status information to the first block. Then, the same writing is sequentially performed for the second block, the third block, ....

The information selecting unit 4 is for obtaining status information before the process is restored by reading the status information stored in each storage block of the first block, the second block and the third block when the process is restored. However, in consideration of the case where the status information is written in the information storage unit 2 by mistake, the status information is correct only when the same status information is read from two or more blocks, which is a majority of the three blocks. Select as status information. The return operation determining unit 5 determines the operation after the return based on the status information selected by the information selecting unit 4. The information restoration unit 6 determines that the information has changed in the storage block that stores the status information different from the status information selected by the information selection unit 4, and stores the selected correct status information by copying it. The information in the block is restored.

In this example, the status information is not treated as information for each bit, but a plurality of bits (in this case, 1 byte = 8 bits) is treated as meaningful information. Also, similar to the conventional example,
Considering the case where there are two operation modes (mode 0 and mode 1), "AAH" is set at the time of mode 0.
("1010 1010B" in binary), "55" in mode 1
The combination is such that at least half (in this case, all bits) of the bit values are different, such as "H"("01010101B" in binary). As described above, as the specified value, it is preferable that binary data of "1" or "0" is at least about 4 bits, and further, "55H" or "99H" for "AAH" described above.
"66H" (2 for binary "1001 1001B")
It is preferable to have a combination of contradictory values such as "0110 0110B" in the base number.

Next, the operation of the above embodiment will be described with reference to FIGS.
This will be described with reference to FIG. 2 to 4 are diagrams for explaining an operation example of the present embodiment, FIG. 2 is a diagram for explaining a write operation to each storage block in the information storage unit, and FIG. 3 is each storage block. FIG. 4 is a diagram for explaining the operation of updating the status information stored in FIG. 4, and FIG. 4 is a diagram for explaining the operation when the status information stored in each storage block changes. First, when the storage control unit 3 detects interruption of data processing or power failure,
As shown in FIG. 2, the current status information is written in the first block, and then the same writing is sequentially performed in the second block, the third block, .... Here, it is assumed that the same writing as "AAH", "66H", ... Is performed in each of the first to third blocks.

At the time of returning from the processing, the operation is performed with the first block as a reference, and it is monitored that the contents in the three storage blocks are always the same. When the status information changes due to various data processing controls, as shown in FIG. 3, the value of the reference first block is updated, and this value is copied to another block. Here, when the value stored in the reference first block changes for some reason, the changed value is not a prescribed value (for example, “56
H ”) and the case where the changed value happens to be the specified value (for example,“ AAH ”) will be described separately.

When the changed value is "56H", this "56H" is not a prescribed value, so that it is immediately recognized that the written information has changed, and as shown in FIG. , By comparing with the other two blocks, the correct value is determined to be “55H” and the reference block is moved to the second block to operate. Then, the status information in the second block is copied to the first block and restored.

Next, when the changed value is "AAH", since this "AAH" is a prescribed value, it is not known immediately whether there is a change in the written information, but in this example. In this case, since the same specified value is always written in all three blocks, in this case, the correct value is determined to be "55H" by the majority decision, and the reference block is changed to the next "55H". Moves to a block (in this case, the second block) in which is stored and operates. Then, in the first block, the status information in the block in which the correct status information is stored is copied and restored. By repeating these operations, all three blocks can always be maintained at the same specified value and operated.

As described above, according to the present invention, since the status information is handled as a plurality of bits, it is possible to easily detect that there is a bit change for a bit change of about 1 bit. Further, by dividing the information storage unit 2 into a plurality of storage blocks and storing status information in each of the storage blocks, reliability of data storage is improved and a read error of operation information due to a bit change is prevented. be able to.

In the above embodiment, the information storage unit 2
Although the inside is divided into three storage blocks, the number of divisions is arbitrary. Also, it goes without saying that the number of bits and the definition of the status information are free. Further, the information storage unit 2 is not limited to the EEPROM, and any writable nonvolatile storage medium, for example, an HDD (Hard D
isk Drive) and MOD (Magneto Optical disk Drive)
Etc. may be used. In this case, a volatile memory may be used as long as it is backed up by a power supply different from the main power supply.

[0022]

EFFECTS OF THE INVENTION It is possible to reliably store status information and prevent malfunction of the device due to changes in status information.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a data processing device of the present invention.

FIG. 2 is a diagram for explaining a write operation for each storage block in the information storage unit.

FIG. 3 is a diagram for explaining an update operation of status information stored in each storage block.

FIG. 4 is a diagram for explaining an operation when status information stored in each storage block changes.

FIG. 5 is a schematic diagram of a memory map of an EEPROM serving as an information storage area.

FIG. 6 is a flowchart showing an example of operation mode determination at the time of operation recovery.

FIG. 7 is a diagram for explaining a problem of a conventional example.

[Explanation of symbols]

 1 data processing device 2 information storage unit 3 storage control unit 4 information selection unit 5 return operation determination unit 6 information restoration unit

Claims (3)

[Claims] 1. When a processing interruption condition is satisfied, a plurality of status information indicating various operating states at the present time are stored in a predetermined area, and before the processing interruption based on the plurality of status information stored in the predetermined area at the time of returning from the processing. A data processing device that reproduces the above state, the information storage unit having a plurality of storage blocks for storing the status information, and the same writing of the status information to each storage block of the information storage unit. The storage control unit that stores the information by reading the status information stored in each storage block in the information storage unit at the time of processing recovery, and the information that selects the status information that is the majority of the read status information. A selecting unit and an operation at the time of returning from the process are determined based on the status information selected by the information selecting unit. A data processing device comprising: a return operation determination unit. 2. The data processing according to claim 1, further comprising an information restoration unit that copies status information selected by the information selection unit to a storage block that stores status information other than the selected status information. apparatus. 3. The status information according to claim 1, wherein the status information is a defined value having a plurality of bit lengths, and values indicating various states in the status information have different bit values of at least half or more. Item 2. The data processing device according to item 2.