JP2000207066A - Method for starting microcomputer and starting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a microcomputer starting method and a starting system capable of easily performing start confirmation by deciding the power supply of a microcomputer system and the reset by a key switch for reset. SOLUTION: This starting system of a microcomputer is generally composed of an input-output device 2, a power supply detection circuit 3, a controller 4, a key switch 5 for rest, a key reset detection circuit 6, a reset factor identification circuit 7, a storage device 8, a flash memory 9, a random access memory (described RAM below) 10, a bus 12 and a bus conversion device 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage medium storing a microcomputer start-up program, and more particularly to a microcomputer start-up method and a start-up system for judging resetting after power-on and by a reset key switch. Belong.

[0002]

2. Description of the Related Art An example of a conventional microcomputer start-up system is disclosed in Japanese Patent Application Laid-Open No. Hei 10-222362. This publication states that erasable and writable EEP
A ROM, a ROM storing a program indicating an erasing / writing procedure of the EEPROM, and a CPU;
In a microcomputer capable of executing erasing and writing by a program for erasing and writing (hereinafter referred to as a boot program) in a ROM and a program in ROM,
It describes that when a PROM is rewritten, both a boot program in the EEPROM and a program in the ROM are selected by an address to be accessed, and a mode executable by the CPU is provided.

[0003] To change the microcomputer start-up program, the ROM in which the program is recorded is exchanged, or the ROM is changed to a flash memory, which is an erasable and writable read memory, and is separately prepared by switching the start-up mode. The erasing and writing of the flash memory is performed from the startup ROM.

The publication, publication or patent number of a gazette related to the present invention is disclosed in Japanese Patent Application Laid-Open No. 9-3194.
45: Information processing apparatus with answering machine function, JP-A-9-369
93: Facsimile machine, JP-A-4-175838: Dump method at the time of automatic reboot, JP-A-4-13702
3: Restart system of computer system, JP-A-6
3-214839: There is a program runaway prevention device and the like.

[0005]

However, the prior art has the following problems. Rewriting the EEPROM requires a procedure of erasing and writing the program. Therefore, when changing the boot program in the EEPROM, it is necessary to rewrite the data in the EEPROM. However, it takes time for the device to rewrite the EEPROM. Was. In addition, it is necessary to incorporate a program capable of executing erasing and writing of the EEPROM as a ROM corresponding to the erasing of the erasing and writing program itself,
As a result, there is a problem that it is difficult to downsize the microcomputer start-up system.

The present invention has been made in view of such a problem, and an object of the present invention is to determine whether to turn on the power of a microcomputer device and to reset by a reset key switch, and to easily confirm startup. An object of the present invention is to provide a start-up method and a start-up system for a microcomputer.

[0007]

The gist of the present invention is a method for starting up a microcomputer by resetting with a power switch or a reset key switch. A power reset detection circuit detects a reset at power-on, a key reset detection circuit detects a reset at the reset key switch, and any one of these reset factors is input. In the case of a reset at the time of power-on, the peripheral device initialization data of the microcomputer is copied from the flash memory to the RAM. Claim 2
The gist of the present invention is that when the peripheral device initialization data on the RAM is changed, a start-up is confirmed by resetting by the reset key switch, and a flag of a flash memory data transfer command flag on the RAM is set. ON
Or, if the flag is OFF, the R
2. The method according to claim 1, wherein said peripheral device initialization data on an AM is written in said flash memory. The gist of the present invention as set forth in claim 3 is that the control device of the microcomputer is reset by power-on and reset by the reset key switch, and executes the first program stored in the flash memory. The first program determines whether resetting is performed by turning on power or resetting by the reset key switch. In the case of resetting by turning on power, the RAM is initialized, and the second program stored in the flash memory is stored in the RAM. 3. The method according to claim 1, wherein the first program executes the second program stored in the RAM as a third program. The gist of the present invention described in claim 4 is that, in the case of resetting by the reset key switch, the state of the third program stored in the RAM is held, and the state of the third program is stored in the RAM from the first program. 4. The microcomputer according to claim 1, wherein the third program is executed, and the third program initializes an input / output device, a bus converter, and the peripheral device. In the above method. The gist of the present invention resides in that the control device is reset by the power-on and the reset key switch, and the power is turned on and the reset factor of the reset key switch is read (step S1). It is determined whether the reset is made by turning on or the reset key switch. If the reset is made by the reset key switch, the process proceeds to step S4 (step S4).
2) In the case of reset by turning on the power, the peripheral device initialization data stored in the flash memory is stored in the R
The peripheral device is initialized (step S4) based on the contents of the peripheral device initialization data stored in the RAM (step S3), and it is determined whether the peripheral device starts up normally. (Step S
5) The method according to any one of claims 1 to 4, wherein when the peripheral device does not start up normally, the power is turned on again (step S6), and the process returns to the step S1. Exists. The gist of the present invention is that, when the peripheral device starts up normally, a flag of a flash memory data transfer command on the RAM is turned off (step S7), and a RAM data rewrite command is issued by a command input. If it is determined that the RAM data rewrite command has not been determined, the process proceeds to step S10 (step S8),
When there is a judgment of the RAM data rewrite command,
The peripheral device initialization data stored in the RAM is rewritten, and the flag of the flash memory data transfer command on the RAM is turned ON (step S9).
It is determined whether or not the flash memory data transfer command has been issued from the RAM by the command input (step S10). If it is determined that the flash memory data transfer command has been issued, the flag of the flash memory data transfer command on the RAM is determined. Is confirmed to be OFF (step S11), and when the flag of the flash memory data transfer command is OFF, the peripheral device initialization data stored in the RAM is transferred to the flash memory (step S12). A method for starting up a microcomputer according to any one of claims 1 to 5, characterized in that: The gist of the present invention described in claim 7 is:
If the flag of the flash memory data transfer command is O
If it is not in the FF state, the peripheral device initialization data stored in the RAM is not transferred, a warning message is displayed (step S13), and it is determined whether to operate the reset key switch. (Step S1
4) If the reset key switch is not operated, the flow returns to step S8 according to claim 6, while if it is determined in step S10 according to claim 6 that the flash memory data transfer command is not performed. 7. The method according to claim 1, wherein the process proceeds to step S14. The gist of the present invention is that when the reset key switch is operated, the microcomputer is reset by resetting the reset key switch and the microcomputer is restarted (step S15). 8. The method according to claim 1, wherein the method returns to step S1. Claim 9
The gist of the present invention resides in a storage medium in which a program capable of executing the microcomputer start-up method according to any one of claims 1 to 8 is recorded. The gist of the present invention is a system for starting up a microcomputer by resetting with a power switch or a reset key switch, wherein reset determination means for resetting a hardware reset factor by the power on and reset key switch is provided. In the case of a reset at the time of power-on based on the judgment result of the reset judging means, there is provided a microcomputer start-up system characterized in that the peripheral device initialization data of the microcomputer is copied from the flash memory to the RAM. 12. The gist of the present invention according to claim 11, wherein the reset determination means includes a power-on detection circuit for detecting a reset by power-on, a key reset detection circuit for detecting a reset by the reset key switch, and the power-on detection. A reset factor identification circuit for recognizing which of the circuit and the key reset detection circuit caused the reset, and a control device for determining a reset factor recognized by the reset factor identification circuit. A startup system for a microcomputer according to claim 10. 13. The gist of the present invention according to claim 12, wherein the input / output device for inputting / outputting a command from an external terminal such as a personal computer, the power-on detection circuit, and the reset key switch capable of restarting the power-on operation. The key reset detection circuit, the factor identification circuit, the control device, a storage device having the flash memory and the RAM, and a bus connecting the input / output device, the storage device, and the control device And a bus conversion device for converting data between the bus and an external peripheral device. The gist of the present invention described in claim 13 resides in a computer having the microcomputer start-up system according to any one of claims 10 to 12.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, the start-up system of the microcomputer according to the present embodiment includes:
I / O device 2, power-on detection circuit 3, control device 4, reset key switch 5, key reset detection circuit 6, reset factor identification circuit 7, storage device 8, erasable and writable read memory (hereinafter referred to as flash memory) ) 9
And random access memory (hereinafter referred to as RAM) 1
0, a bus 12, and a bus converter 13.

The resetting means for determining the cause of hardware reset by the power-on and reset key switch 5 includes a power-on detection circuit 3 for detecting a reset by power-on and a key reset detection for detecting a reset by the reset key switch 5. A reset factor identification circuit 7 for recognizing which of the circuit 6, the power-on detection circuit 3 and the key reset detection circuit 6 has caused the reset.
And a control device 4 for determining a reset factor recognized by the reset factor identification circuit 7.

As shown in FIG. 1, a terminal 1 such as a personal computer having an input device such as a keyboard and an output device such as a display device is connected to an input / output device 2. The terminal 1 is used to rewrite the contents of the RAM 10 by a command input from a keyboard or to display the execution state of a program on a display to confirm the state.

When the power is turned on, a reset is detected by a power-on detection circuit 3. The key reset detection circuit 6 detects that the reset key switch 5 has been pressed, and detects the reset. The controller 4 recognizes which of these factors caused the reset and recognizes it by the reset factor identification circuit 7.

The input / output device 2 and the storage device 8 are
And a bus 12. Further, the storage device 8 includes
A flash memory 9 and a RAM 10 are provided.

As shown in FIG. 2, when the power is turned on and when the reset by the reset key switch 5 is turned on, the control unit 4 is turned on.
Is reset, and the first program A1 stored in the flash memory 9 is executed. This first program A
1 determines whether the reset is performed by turning on the power or the reset key switch 5, and in the case of the reset by turning on the power, the RAM 10 is initialized and the second program A2 stored in the flash memory 9 is copied to A3 of the RAM 10. . After the copy is completed, the first program A1
The second program A2 stored in the AM 10 is executed as a third program A3.

In the case of resetting by the reset key switch 5, the third program A3 stored in the RAM 10
Is maintained without being erased. Therefore, the third program A3 stored in the RAM 10 is executed from the first program A1 without copying. Third program A3
Are the input / output device 2, the bus converter 13 and the peripheral device 11
Make the initial settings for.

Next, the operation of the microcomputer start-up method according to the present embodiment will be described in detail with reference to the flowchart of FIG.

First, a reset factor is read (step S1).

It is determined whether the reset is made by turning on the power. If the reset is not made by turning on the power, the process proceeds to step S4 (step S2).

In the case of a reset by turning on the power, the peripheral device initialization data stored in the flash memory 9 is stored in the RA.
Copy to M10 (step S3).

The initialization of the peripheral device 11 is performed based on the contents of the peripheral device initialization data stored in the RAM 10 (step S4).

It is determined whether the peripheral device 11 does not start up normally (step S5).

If the peripheral device 11 does not start up normally, the power is turned on again (step S6). Here, the process returns to step S1.

When the peripheral device 11 starts up normally,
The flag of the flash memory data transfer command on the RAM 10 is turned off (step S7).

A RAM data rewrite command is determined based on the command input (step S8).

If the RAM data rewrite command is determined, the peripheral device initialization data stored in the RAM 10 is rewritten, and the flag of the flash memory data transfer command on the RAM 10 is turned on (step S).
9).

A flash memory data transfer command on the RAM 10 is determined by a command input (step S1).
0).

When the flash memory data transfer command is determined, it is checked whether the flag of the flash memory data transfer command on the RAM 10 is in the OFF state (step S11).

If the flag of the flash memory data transfer command on the RAM 10 is OFF, the peripheral device initialization data stored in the RAM 10 is transferred to the flash memory (step S12).

If the flag of the flash memory data transfer command on the RAM 10 is not in the OFF state, a warning message is displayed and the transfer of the peripheral device initialization data is not performed (step S13).

It is determined whether or not the reset key switch 5 is operated (step S14).

If the reset key switch 5 is not operated, the process returns to step S8. If it is determined in step S10 that no flash memory data transfer command is issued, the process proceeds to step S14.

When the reset key switch 5 is operated, the apparatus is restarted (step S15), and the process returns to step S1.

In the present embodiment, the present invention is not limited to this, and can be applied to a computer startup method and a computer startup system suitable for applying the present invention.

Further, the number, position, shape, etc. of the above-mentioned constituent members are not limited to the above-described embodiment, but can be set to a suitable number, position, shape, etc. for carrying out the present invention.

[0034]

Since the present invention is configured as described above, the following effects can be obtained. Since the microcomputer start-up program runs on the RAM, EEPRO
Since the procedure of erasing and rewriting is not required unlike M, the microcomputer startup program can be easily changed.

Also, since the program for erasing and rewriting the EEPROM is copied to the RAM and executed, there is no need to provide a dedicated ROM.
It is not necessary to incorporate a program for erasing and rewriting the ROM.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a microcomputer startup system according to the present embodiment.

FIG. 2 is a memory configuration diagram showing the operation of FIG.

FIG. 3 is a flowchart illustrating a specific example of the operation in FIG. 1;

[Explanation of symbols]

 A1 First program A2 Second program A3 Third program 1 Terminal 2 Input / output device 3 Power-on detection circuit 4 Control device 5 Reset key switch 6 Key reset detection circuit 7 Reset factor identification circuit 8 Storage device 9 Flash memory 10 RAM 11 Peripheral devices 12 Bus 13 Bus converter

Claims (13)

[Claims] 1. A method for starting up a microcomputer by resetting with a power switch or a reset key switch, wherein a reset factor of hardware by a power switch and a reset key switch is detected by a power-on detecting circuit. A reset is detected, a reset by the reset key switch is detected by a key reset detection circuit, and any of these reset factors is identified by a reset factor identification circuit by a reset factor identification circuit. In the case of (1), a method of starting up the microcomputer, wherein the initialization data of the peripheral device of the microcomputer is copied from the flash memory to the RAM. 2. When the peripheral device initialization data on the RAM is changed, a start-up is confirmed by resetting by the reset key switch, and a flag of a flash memory data transfer command on the RAM is turned on or off.
2. The microcomputer startup method according to claim 1, wherein F is determined, and when the flag is OFF, the peripheral device initialization data on the RAM is written to the flash memory. 3. The control device of the microcomputer is reset by turning on the power and resetting by the reset key switch, and executes the first program stored in the flash memory. A reset by the reset key switch, and in the case of a reset by turning on the power, initializes the RAM; copies a second program stored in the flash memory to the RAM; 3. The microcomputer start-up method according to claim 1, wherein one program executes the second program stored in the RAM as a third program. 4. In the case of reset by the reset key switch, the state of the third program stored in the RAM is held, and the third program stored in the RAM is executed from the first program. 4. The microcomputer start-up method according to claim 1, wherein the third program initializes an input / output device, a bus converter, and the peripheral device. 5. A reset is applied to the control device by power-on and the reset key switch, and a reset factor of the power-on and reset key switch is read out (step S1). It is determined whether or not the reset operation is performed by the reset key switch. If the reset is performed by the reset key switch, the process proceeds to step S4 (step S2). The peripheral data is copied to the RAM (step S3), the peripheral device is initialized according to the contents of the peripheral device initialization data stored in the RAM (step S4), and the peripheral device normally starts up. It is determined whether or not the peripheral device does not start up normally (step S5). The method according to any one of claims 1 to 4, wherein in this case, the power is turned on again (step S6), and the process returns to step S1. 6. When the peripheral device has started up normally, a flag of a flash memory data transfer command on the RAM is turned off (step S7), and it is determined whether or not a RAM data rewrite command is issued by a command input. If the RAM data rewrite command is not determined, the process proceeds to step S10 (step S10).
8) If there is a judgment on the RAM data rewrite command,
The peripheral device initialization data stored in the RAM is rewritten, the flag of the flash memory data transfer command on the RAM is turned on (step S9), and the flash memory data transfer command is issued from the RAM by command input. It is determined whether or not the flash memory data transfer command is issued (step S10). If it is determined that the flash memory data transfer command flag on the RAM is OFF (step S10).
11) The flag of the flash memory data transfer command is O
6. The method according to claim 1, wherein the peripheral device initialization data stored in the RAM is transferred to the flash memory (Step S12). . 7. When the flag of the flash memory data transfer command is not in the OFF state, the peripheral device initialization data stored in the RAM is not transferred, and a warning message is displayed (Step S).
13), it is determined whether or not the reset key switch is operated (step S14). If the reset key switch is not operated, the process returns to step S8 according to claim 6. 7. The microcomputer start-up method according to claim 1, wherein if it is determined in step S10 that the flash memory data transfer command is not issued, the process proceeds to step S14. 8. When operating the reset key switch, a reset is performed by the reset key switch, and the microcomputer is restarted (step S10).
15) The method for starting up a microcomputer according to any one of claims 1 to 7, wherein the process returns to step S1 described in claim 5. 9. A storage medium on which a program capable of executing the microcomputer start-up method according to claim 1 is recorded. 10. A system for starting up a microcomputer by resetting with a power switch or a reset key switch, comprising: reset determination means for resetting a hardware reset factor by a power on and reset key switch. A system for copying the peripheral device initialization data of the microcomputer from the flash memory to the RAM in the case of a reset at the time of power-on based on the judgment result. 11. The reset determination means includes a power-on detection circuit for detecting a reset due to power-on, a key reset detection circuit for detecting a reset by the reset key switch, the power-on detection circuit, and the key reset detection. 11. The circuit according to claim 10, further comprising: a reset factor identification circuit for recognizing which of the circuit causes the reset, and a control device for determining a reset factor recognized by the reset factor identification circuit. Microcomputer startup system. 12. An input / output device for inputting / outputting a command from an external terminal such as a personal computer, the power-on detection circuit, the reset key switch capable of restarting the power-on state, and the key reset detection. A circuit, the factor identification circuit, the control device, a storage device having the flash memory and the RAM, a bus connecting the input / output device, the storage device, and the control device, 12. The microcomputer start-up system according to claim 10, further comprising: a bus converter that converts data with the peripheral device. 13. A computer comprising the microcomputer start-up system according to claim 10.