JPH07191783A - Controller - Google Patents

Abstract

PURPOSE:To provide a means capable of judging whether or not a reset is executed by starting a power source when a system becomes a reset state at the time of starting the power source or at the time of an abnormal situation for some reason in the system debug stage, for example, of an experimental model in a facsimile equipment storing a reception original and register data in a memory, etc. CONSTITUTION:The facsimile equipment is provided with a data storing RAM 6A, a reset circuit 9 and a system control part 1 having ROM 1A storing initialization program which is executed by CPU 1B and is constituted in such a way that fixed data is written in the initialization and in a certain area of data storing RAM 6A, data of the area is compared when the initialization program is executed at the time of resetting so that it is judged whether or not the reset operation is executed by starting the power source at first.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device, for example, a control device for a facsimile machine which stores a received document or registration data in the storage means by using a storage means such as a memory.

[0002]

2. Description of the Related Art Conventionally, for example, in a facsimile machine, when a storage means such as the memory stores data, a checksum or the like is stored at the same time. Then, when the power is turned on or any abnormal situation occurs, the system is reset and the initialization program is executed. At this time, the checksum in the memory is also checked at the same time, and if they are different, the memory management list or the like is output.

[0003]

However, in the above-mentioned prior art, it is not necessary to check the checksum even when the system is first started up before the checksum calculation. A memory list or the like is output. In particular, since it tries to output even a checksum error at the stage of board mounting and system debugging in an early prototype, the output is made when the power is turned on even when the recording unit is not mounted or completed. Because of this, there was a possibility of double or triple troubles. Also, when the system was in the reset state, it was not possible to determine whether it was due to power up or a reset signal.

The present invention has been made in consideration of the problems of the conventional example as described above. When the system is in the reset state in the above cases, is it a reset from the first power-on? The purpose is to provide a means by which it can be judged.

[0005]

For this reason, in the present invention, in this type of control device, in particular, a control device having a memory, data retention is ensured even after power-off by a backup circuit or the like, or non-volatile. Data storage means, reset means for resetting the system at power-on and abnormal conditions, program storage means for storing the program executed by the CPU, and the program storage means for storing the program stored in the program storage means. An initialization program to be executed at the time of reset is provided, and fixed data is written to an area having the data storage means in the initialization program, and the fixed data is compared when the initialization program is executed at reset. Therefore, it is determined whether or not this reset operation is caused by the first power-on. Or a second data storage for ensuring that the backup circuit retains the data even after the power is turned off, or whether the data is not retained after the power is turned off. Means and reset means for resetting the system at power-on and in an abnormal situation;
A program storage means for storing a program executed by the PU and an initialization program stored in the program storage means and executed at the time of the reset are provided, and the initialization program is provided in an area where the data storage means is provided. The fixed data is written, and at the time of execution of the initialization program at the time of reset, it is determined whether or not the reset operation is caused by the first power-on by comparing the fixed data. In the case of the first data storage means, the data storage means has means for allowing the operator to select whether or not to initialize the data, or in the case of the second data storage means, the power is turned on by the judgment. Configured to have means for allowing the operator to select initialization of the data when not in reset operation The Rukoto, in which so as to achieve the above object.

[0006]

With the configuration of the present invention as described above, by always writing the fixed data in the area having the data storage means in the initialization program stored in the program control section and executed at the time of reset, the reset operation is turned on. It can be surely determined whether or not the reset is due to the raising.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the respective embodiments: (First Embodiment) FIG. 1 is a block diagram showing the configuration of a facsimile apparatus according to the first embodiment of the present invention. In the figure, 1
Is a system control unit, which is composed of, for example, a microcomputer CPU 18 and a storage circuit, and can be recorded on a recording sheet on which ROM 1A in which a control procedure program is stored in advance and one page of received image data is installed It includes a means for determining whether or not, and a control means for reducing or deleting the image data to a length that can be recorded on a recording sheet.

A reading unit 2 is a CCD image sensor for reading a transmission original conveyed by the original conveying rollers 2B, a means for determining the presence or absence of the original, and whether or not the original is at the reading position. It is composed of a designation means for. A recording unit 3 is for recording the image controlled by the image control unit on a recording sheet by, for example, electrophotographic thermal transfer.

Reference numeral 4 denotes an operation section, on which various operation keys are arranged. In the operation unit 4, a switch (not shown) for notifying the operator that the checksum is different in the reset state used in the present embodiment and outputting the memory list or the like to the operator is shown. Is provided. A display unit 5 is for displaying a status display, an alarm display, etc., and also has a function as a notification means used in this embodiment. It should be noted that the operation unit 4 and the display unit 5 may be configured as a single operation display unit. 6A serves as a data storage means for communication such as the telephone number of the own device, the user abbreviation, and the telephone number of the other party. Register the data,
It is a non-volatile RAM for registering checksums of those data. In addition, this non-volatile RAM 6A
Uses a volatile memory backed up by a battery, but other non-volatile memory may be used. 6B
Is a volatile RAM, which is a volatile RAM for storing communication data at the time of reception. 6C is volatile RAM
An image memory for storing received or read image data. As this RAM, the volatile RAM 6C is used in this embodiment, but a hard disk may be used. A modem (modulation / demodulation device) 7 modulates / demodulates a transmission / reception signal.

An NCU (network control unit) 8 has a function for transmitting a selection signal (pulse or tone dialer), and not only performs automatic incoming call operation and line control operation by ringing tone detection, but also system control. Under the control of the unit 1, a selection signal is sent to the telephone line 12.

The reset circuit 9 is a watchdog timer circuit that operates by stopping the system clock from the system control unit 1, and outputs a reset signal to the system control unit 1 when the power is turned on or when an abnormal operation occurs.

The operation at power-on and the operation at abnormal reset will be described below.
It is characterized in that specific fixed data is always written in an area of the nonvolatile RAM 6A after the power is turned on. This fixed data has a value (for example, 0) that does not affect the checksum calculation.

When the power is turned on for the first time, the system controller 1 executes the initialization program stored in the ROM 1A, and at this time, 0 is written in the predetermined address (C0000H) of the nonvolatile RAM 6A. If it is not written, it is judged as the first power-on and the memory clear list is not output even if the checksum is different.

The operation upon power-on and the operation upon abnormal reset will be described below: It is assumed that the system always writes specific fixed data to an area of the nonvolatile RAM 6A after power-on. As described above, this fixed data has a value (for example, 0) that does not affect the checksum calculation.

When the power is turned on for the first time, the system controller 1 executes the initialization program stored in the ROM 1A, and at this time, 0 is written in a predetermined address (C0000H) of the nonvolatile RAM 6A. If it is not written, it is determined that this reset operation is caused by the first power-on, and the memory clear list is not output even if the checksum is different.

The initialization program of this embodiment will be described below with reference to the flowchart of FIG.

In this facsimile, a reset signal is input to the CPU 1B by the reset circuit 9 when the power is turned on, and the facsimile is executed from the set reset address.
This flowchart shows the operation of the initialization program executed from the state when it rises from this reset address.

In step S1, 0 is written to the power-on flag stored in the volatile RAM 6B to initialize it. In step S2, the reset flag stored in the nonvolatile RAM 6A is read to check whether this value is 0 or not. 0
In the case of, proceed to step S4, and if not 0, step S3
Go to. In step S4, the checksum of the registration area stored in the nonvolatile RAM 6A is checked. If the stored checksum data and the calculated checksum data are equal, the process proceeds to step S8. If they are not equal, the process proceeds to step S5. In step S3, 1 is written in the power-on flag stored in the volatile RAM 6B to indicate that this initialization operation is the first power-on, and the process proceeds to step S5.

In step S5, the registration area stored in the non-volatile RAM 6A is initialized, and the process proceeds to step S6. In step S6, it is checked whether the power-on flag stored in the volatile RAM 6B is 1, and if it is 1, it is determined that the power is turned on for the first time, and the process proceeds to step S8. If it is 0, the process proceeds to step S7. In step S7, the contents cleared in step S5 are output as a list,
Go to step S8. In step S8, a non-volatile RAM
0 is written in the reset flag stored in 6A, and the checksum data is checked in step S4 at the subsequent power-on. In step S9, the standby state is entered after the above initialization processing is completed.

(Second Embodiment) In the system of the first embodiment, the system controller 1 is activated when the power is first turned on.
Executes the initialization program stored in the ROM 1A, checks whether 0 is written at a predetermined address (C0000H) of the non-volatile RAM 6A at this time, and if it is not written at this time, the first Although the memory clear list is not output even if it is determined that the power is turned on and the checksum is different, the present invention is not limited to this operation, and the display unit 5 can be turned on for the first time when the power is turned on. For example, as shown in Fig. 2, "System startup error:" Do you want to output a memory clear report? It is also possible to display "" and allow the operator to select the output of the memory clear list by the operation unit 4.

(Third Embodiment) In the system of the above embodiment, when the system control unit 1 executes the initialization program stored in the ROM 1A, it always stores fixed data in an area having a predetermined volatile RAM 6C. It should be written.

The system controller 1 is reset by a reset signal from the reset circuit 9 due to power-on or abnormal operation, and the initialization program stored in the ROM 1A is executed. At this time, 0 is set in the address (100000H) of the volatile RAM 6C determined in advance.
Check whether or not is written, and if it is not written at this time, determine that it is a reset operation from power-on,
The volatile RAM 6C can be configured to keep the stored image data without clearing the memory.

(Fourth Embodiment) In the system of the fourth embodiment, the address (100) of the volatile RAM 6C which is predetermined when the initialization program is executed from the reset state.
000H) has been written with 0, and if it has not been written at this time, it is determined that the reset operation has started from power-on, and the stored image data is retained without clearing the memory of the volatile RAM 6C. However, the present invention is not limited to this operation, and the display unit 5 displays a reset operation from power-on as shown in, for example, FIG. Four
It is also possible to allow the operator to select the memory clear and the output of the memory clear list.

The present invention is not limited to the above-mentioned facsimile machine, but can be applied to all control devices that execute an initial program having a memory.

[0025]

As described above, according to the present invention,
Whether the reset operation is the first power-on reset by writing fixed data in the area where the data storage means is stored in the initialization program stored in the program storage means of the system control unit and executed at reset It has become possible to reliably judge whether or not.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a facsimile apparatus according to an embodiment.

FIG. 2 is an example of a display on the display unit shown in FIG.

FIG. 3 is a flowchart showing an initialization program of this embodiment.

[Explanation of symbols]

 1 System Controller 1A ROM 1B CPU 5 Display 6A Nonvolatile RAM 6B Volatile RAM 6C Volatile RAM 8 Network Control Unit (NCU)

Claims (2)

[Claims] 1. A backup circuit ensures data retention even after power-off, or a non-volatile data storage means, a reset means for resetting the system at power-on and an abnormal situation, and a CPU. A program storage means for storing a program to be executed, and an initialization program stored in the program storage means and executed at the time of the reset are provided. Fixed data is stored in an area of the data storage means in the initialization program. And a means for determining whether or not this reset operation is the first power-on by comparing the fixed data when the initialization program is executed at the time of reset. Control device. 2. A data storage means for ensuring data retention even after power-off by a backup circuit, a reset means for resetting the system at power-on and abnormal situations, and a program executed by the CPU. A program storage unit for storing the program and an initialization program stored in the program storage unit and executed at the time of the reset are provided, and fixed data writing processing is performed in the initialization program in an area where the data storage unit is present. At the same time, when the initialization program is executed at reset, it is determined whether or not this reset operation is caused by the first power-on by comparing the fixed data, and at this time, the data in the data storage means is initialized. A control characterized by having means for allowing an operator to select whether or not to Your device.