JPH05241816A - Data processor - Google Patents

Abstract

PURPOSE:To provide a data processor by which the writing or rewriting of a necessary program or data can be attained without necessitating the mounting or exchanging operation of a storage means such as a P-ROM. CONSTITUTION:This device is equipped with the first storage means (ROM 4) which stores a writing processing program (IPL program) for operating the writing of the program or data to be inputted from an outside, processing means (CPU 2) which executes the writing processing program, inputting means (RS-232C interface 10 and I/O port 12) which inputs the program or data inputted from the outside based on the execution of the writing processing program of the processing means, and second storage means (EE.PROM 6) constituted of a writable nonvolatile memory which stores the program or data inputted through the inputting means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing device having a non-volatile memory for storing the operation of the device and data necessary for the operation in advance, and the data processing device capable of sequentially reading and executing programs and data. Regarding

[0002]

2. Description of the Related Art Conventionally, in a data processing apparatus such as a printer having a built-in microprocessor, programs and data required for processing such as printing are stored in a storage means such as a P-ROM.
It is fixed.

The storage means such as a P-ROM is mounted in such a manner that an IC socket is mounted on a printed circuit board or the like, the printed circuit board is completed, and then the memory means is mounted on the IC socket.

[0004]

By the way, such a data processing device is convenient for replacing the storage means such as a P-ROM at the time of a program defect or version upgrade, while it is an IC socket on a printed circuit board or the like. It is necessary to attach the P-ROM and the like to the IC socket by hand at the time of assembly. For this reason, there is a drawback in that it is impossible to automate the completion of the printed circuit board assembly, and the manufacturing cost is increased because a manual process is required.

Therefore, it is an object of the present invention to provide a data processing apparatus capable of writing and rewriting necessary programs and data without the need for mounting or exchanging storage means such as a P-ROM. To do.

[0006]

The data processing apparatus of the present invention comprises a first storage means (ROM 4) for storing a program to be input from the outside and a write processing program for writing data, and the write processing. Program (IP
Processing means (CPU 2) for executing the L program) and input means (RS-232C interface 10, I / O port 12) for inputting the program and the data from the outside based on the execution of the write processing program by the processing means. And a second storage means (EE / PROM 6) composed of a writable nonvolatile memory for storing the program and the data input through the input means.
It is characterized by having and.

[0007]

In the data processor of the present invention, the necessary programs and data are not fixed to the P-ROM or the like, but the programs and data are stored in the second storage means composed of the non-volatile memory such as EE / PROM. The first storage means stores a write processing program for storing and fixing a program or data input from the outside in the second storage means composed of a non-volatile memory. Therefore,
In this data processing device, a program or data can be loaded from the outside in the finished product state. Therefore, even after assembling the product, it is possible to transfer or modify the program or data from the outside, and it is possible to reduce the manufacturing cost and improve the service function such as version upgrade.

[0008]

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 shows an embodiment of the data processing apparatus of the present invention. This data processing device includes a central processing unit (CP) as processing means for executing various programs.
U) 2 is installed, and a read-only memory (ROM) 4 is installed as a first storage unit that stores various programs that control the CPU 2. In this case, the program stored in the ROM 4 is an IPL as a write processing program for executing a process of storing a program or data from the outside which is the basis of the present invention.
(Initial Program Loader) Contains the program.

This data processing device corresponds to the ROM 4 and corresponds to the EE as a second storage means composed of a non-volatile memory.
・ PROM6 is installed side by side. This EE / PROM6
Stores programs and data from the outside.

A memory (RAM) 8 that can be written at any time is installed as a third storage means. This RAM
Reference numeral 8 is used for temporarily storing the data input from the outside in order to edit the data.

Further, an RS-232C interface 10 and an I / O port 12 are installed as means for inputting programs and data. The I / O port 12 is provided with a data loading switch 14 as a switch for selecting whether to input a program or data. That is, when the data loading switch 14 is turned on by an external operation, the data loading mode is set.

A reset circuit 16 is connected to the CPU 2, and the reset circuit 16 works in conjunction with a power switch (FIG. 2). Therefore, when the power is turned on, the CPU 2 is reset to the initial state through the reset circuit 16.

Next, the IPL in this data processing device
The program will be described with reference to the flowcharts shown in FIGS. In FIGS. 2 and 3, circled symbols a and b represent connection points in the flowchart.

When the power switch is turned on in step S1, the reset circuit 16 inputs a reset signal to the CPU 2 to reset the CPU 2. When the CPU 2 is reset, the CPU 2 sequentially reads the IPL program in the ROM 4 and starts its execution. At this time, step S
In 2, the data loading switch 14 is inspected, and if the data loading switch 14 is ON,
Control goes to step S3. In step S3, EE
-After erasing the data in PROM6, the process proceeds to step S4, and the CPU 2 uses the RS-232C interface 10
Data sent from an external device (host machine) (not shown) is read, and the data is edited and stored in the RAM 8 in step S5. Next, in step S6, R
When the amount of data edited in the AM 8 reaches the specified amount, the process proceeds to step S7, and the CPU 2 reads the edited data from the RAM 8 and stores it in the EE / PROM 6. next,
In step S8, it is determined whether or not the transfer of all data has been completed. If the data set for one page is not completed in step S6, or if the transfer of all data is not completed in step S8, the process returns to step S4 and the processes of steps S4 to S8 are performed.

When all the data are transferred to the EE / PROM 6 by repeating this program operation, step S9
Move to. In step S9, the CPU 2 calculates the check code of all data, that is, the checksum code, and EE · P.
After setting in the ROM 6, the written code is written in a specific address of the EE / PROM 6 in step S10.

Next, in step S11, EE / PRO
The program jumps to a specific address of M6 and executes the program or the like sent from the external device in step S12.

When the IPL program inspects the data loading switch 14 in step S2, it is turned off.
If it is, move to step S13, EE / PR
After checking the written code of OM6, step S1
Move to 4 and check the checksum, and if normal, EE
・ Jump to a specific address in PROM6 and EE ・ P
The program written in the ROM 6 is executed. If not normal in steps S13 and S15, the process proceeds to step S16 to perform error processing of the EE / PROM6.

Next, FIG. 4 shows a printer device as an application example of the data processing device of the present invention, and the same parts as those of the embodiment shown in FIG.

This printer receives the print information from the host computer and receives the print information from the host computer, the CPU 2 as a processing means for executing the arithmetic processing necessary for the print processing, and the R as a first storage means in which various programs such as an IPL program are written.
OM4, EE / PROM6 as second storage means for writing external programs and data, RAM8 as third storage means for temporarily writing data, Centronics interface 10 and parallel I as input means for programs and print data. / O port 12 is installed.

The CPU 2 is connected with a reset circuit 16 for performing a power-on reset for returning the processing operation to the initial state when the power supply voltage V _CC is lowered due to the release of the power supply or the like. The reset signal R is applied to the CPU 2 from the reset circuit 16 when the power is turned on. EE / PROM
6, a write control circuit 18 and a write protect switch 2 are provided in order to prevent unnecessary data and the like from being written into the EE / PROM 6 due to a malfunction of the CPU 2 or noise.
0 is set.

A print head control circuit 24 for controlling the print head 22 of the print mechanism is installed and a step motor control circuit 26 for driving the drive mechanism section.
The step motor control circuit 26 is connected to a feed motor 28 for feeding a print sheet and a carriage motor 30 for operating a carriage on which the print head 22 is mounted.

Further, an operation panel 32 in which display elements, switches and the like are arranged is installed, and an operation input from a switch (SW) installed in the operation panel 32 and a display signal for a display element such as LCD or LED are output. An operation panel interface 34 is installed as an input / output means. Further, a DIP switch (SW) 36 for linking with a host computer and setting specifications is installed, and a DIP switch (SW) interface 38 for receiving setting input from the DIP switch 36 is installed.

The parallel I / O port 12 is connected with a data loading switch 14 and a paper sensor 42 for detecting a printing paper, and a detection signal thereof is applied.

And CPU2, ROM4, EE / PR
OM6, RAM8, Centronics interface 1
0, parallel I / O port 12, print head control circuit 2
4, step motor control circuit 26, operation panel interface 34, and DIP switch interface 4
The 0s are linked by the data bus 44 and the address bus 46.

Next, FIG. 5 shows a power supply device in this printer. A power supply circuit 50 that rectifies alternating current and constitutes a stabilized direct current power supply is installed in this power supply device. The power supply circuit 50 is supplied with commercial power through a power plug 52 and a power switch 54, generates driving voltages V _CC and V _H which are stabilized DC voltages, and supplies them to the respective parts shown in FIG.

Next, FIG. 6 shows a specific circuit configuration example of the write control circuit 18 in the printer shown in FIG. A three-input AND circuit 180 is installed in the write control circuit 18, and the AND circuit 180 includes
A write signal WR from the CPU 2, a chip select signal CS inverted through an inverter 182, and a switch input by operating the write protect switch 20 are added. The input part to which the write protect switch 20 is connected is pulled up to the drive voltage V _CC via the resistor 184, and when the write protect switch 20 is closed, the input of the AND circuit 180 shifts to the L level. Is becoming Therefore, this write control circuit 18
Indicates that the write signal WR of the CPU 2 is at the L level, the reset signal R is in the non-reset state (H level), and the write protect switch 20 is ON (the non-protected state).
At this time, a write enable signal to the EE / PROM 6

[Outer 1] Is output.

Next, the IPL program in this printer will be described with reference to FIGS. 7 and 8. In FIGS. 7 and 8, the circled symbols c and d represent connection points in the flowchart.

A power plug 52 is connected to an outlet such as a commercial power source.
After connecting, turn on the power switch 54 from the OFF state.
In this state, the drive voltages V _H and V _CC required for the printer are output to the power supply circuit 50. In step S1, the initial operation is performed based on this power-on. That is, the reset circuit 16 monitors the voltage value of the driving voltage V _CC ,
_{After CC} reaches the specified voltage, for the specified time T,
The reset signal R is output. The reset signal R sets the CPU 2 to the initial state. When the reset signal R is released, the instructions and data are sequentially read from the ROM 4 and the initial operation is performed.

After this initial operation, in step S2, the state of the data loading switch 14 is inspected via the parallel I / O port 12. During the initial operation of executing the command stored in the ROM 4, if the state of the data loading switch 14 is the data loading state (ON state), the process proceeds to step S3, and the operation panel is turned on at the same time when the data loading switch 14 is turned ON. The display elements (LEDs) 32 are started to blink, and the process proceeds to step S4. In step S4, the data in the EE / PROM 6 is erased and the data in the Centronics interface 10 is read. That is, the CPU 2 reads data sent from a higher-level device connected via the Centronics interface 10, for example, a host computer, with the Centronics interface 10, and step S6
Then, the data is edited and stored in the RAM 8. In step S7, it is determined whether or not the data set for one page is completed, and if it is less than one page, the process returns to step S5. Then, when the data set for one page is completed in step S7, the process proceeds to step S8 and the RAM 8
The edited data stored therein is transferred to the EE / PROM 6 and stored therein. At this time, in step S9, the operation panel 32
The buzzer of No. 3 is activated for 0.5 seconds to notify the transfer and storage of data to the EE / PROM 6 with a buzzer sound.

Next, in step S10, it is determined whether or not the data transfer is completed. If the data transfer is not completed, the process returns to step S5, the data transfer is completed, and after storing all the data, the step Go to S11 (Fig. 8), calculate the checksum code, and EE with the written code.
-Write to a specific address in PROM6. At this time,
Steps S12 and S13 are executed, and EE
The operation panel 32 indicates that the PROM 6 is being written.
LED blinks, and in step S14, the buzzer of the operation panel 32 is rung for 2 seconds to display EE / PRO.
Notify that the code already written in M6 is set in EE / PROM6.

Next, in step S15, the EE / PROM
When all data is stored in 6, jump to a specific address (entry address) in EE / PROM6,
In step S16, the command and data of the EE / PROM 6 are used to perform a printing operation, which is a normal operation of a normal device, that is, a printer. At this time, the print data sent from the host computer via the Centronics interface 10 is printed and recorded on the print medium by a known procedure.

If the data loading switch 14 is in the OFF state (data loading prohibited state) in step S2, the process proceeds to step S17, where EE / PRO is set.
It is determined whether or not the code has been written to the specific address of M6. If the code has been written, the process proceeds to step S18, the data of EE / PROM6 is read, the checksum is calculated, and the data is written to EE / PROM6 in step S19. The checksum is compared with the existing checksum, and if they match, the process proceeds to step S15. That is, in step S15, EE
Jump to a specific address (entry address) in the PROM 6, and the CPU 2 sequentially reads and executes instructions and data stored in the EE / PROM 6.

During the initial operation written in the ROM 4 in step S19, the calculated checksum and EE
If the checksum written in the PROM 6 does not match, or if it is a code other than the written code when a specific address of the EE / PROM 6 is read, the process proceeds to step S20. In step S20, it is determined that there is a data error in the EE / PROM 6, and the EE / PROM 6 is activated by an error LED on the operation panel 32, a buzzer,
It informs that the PROM 6 is in an error state.

In this embodiment, the EE / PROM 6
The operation of the data loading switch 14 was set as one condition when writing a program or data to the, but the EE / PROM 6 is inspected when the power is turned on, and if the program is not written, the IPL program is automatically It may be configured to start.

Next, FIG. 9 shows another IPL program. That is, in the data processing device of FIG. 1 and the printer of FIG. 4, the loading switch 14 is turned on after the condition for writing the program in the EE / PROM 6 is reset. The program and data are written to the EE / PROM 6 by using the command. The host device tells the printer to write the program to
Command to enter printer write mode, eg <E
SC># (1BH, 23H) is sent out, followed by EE / P
The program to be written in the ROM 6 is sent out together with the address information and the error detection code. In step S21, the data is received, and in step S22, it is determined whether the data is a write command to the EE / PROM 6 using the error detection code of the received data. When it is determined that the data is normal, the process proceeds to step S23, the record length data is received and the process proceeds to step S24, and it is determined whether it is other than 0. If not 0, step S25
And the load address is received, the data is received in step S26, the checksum is calculated in step S27, and then the checksum is received in step S28.
In step S29, it is determined whether the checksums match. If the checksums match in step S29, the data is written in the EE / PROM 6 in step S30, and the process returns to step S23.

If it is determined to be 0 in step S24, the process proceeds to step S31 and the writing completion display is performed by the display element of the display panel 32. If the checksums do not match in step S29, the process moves to step S32 to display an error. That is, the display means on the operation panel 32 notifies that the data is abnormal.

By repeating the above operation, the EE / PROM 6
When the end code is received, the completion of the program is notified by the display means on the operation panel 32.

Next, the writing process of the program to the EE / PROM 6 may be performed by a combination operation of a plurality of operation switches on the operation panel 32. That is, for example, when the printer is ONLINE and the feed switch and the online changeover switch are operated at the same time, the IPL program is started, and after this operation, the program data is transferred from the external device and the program and data are transferred to the EE / PROM 6. Write. Further, the combination of operation switches for writing data in the EE / PROM 6 does not need to be a feed switch and an online changeover switch.

In the embodiment, the Centronics interface is used for the connection with the external host device, but another interface capable of communicating with the external host device may be used.

Further, in the embodiment, the EE / PROM 6 is exemplified as the second storage means, but other non-volatile storage elements are also possible. Further, although the data writing to the EE / PROM 6 is performed after the reset at power-on, a command (transfer command) from the host device or the operation panel 32
It is also possible to operate the switch, etc., and is not limited to after the reset operation of the CPU 2.

[0042]

As described above, according to the present invention,
Even after assembling the product, it is possible to transfer or modify the program or data from the outside, and it is possible to reduce the manufacturing cost and improve the serviceability such as version upgrade.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a data processing device of the present invention.

FIG. 2 is a flowchart showing an IPL program in the data processing device shown in FIG.

FIG. 3 is a flowchart showing an IPL program in the data processing device shown in FIG.

4 is a block diagram showing a printer device as an application example of the data processing device shown in FIG. 1. FIG.

5 is a block diagram showing a power supply device in the printer device shown in FIG.

6 is a circuit diagram showing a specific circuit configuration example of a write control circuit in the printer device shown in FIG.

FIG. 7 is a flowchart showing an IPL program in the printer device shown in FIG.

FIG. 8 is a flowchart showing an IPL program in the printer device shown in FIG.

9 is another IPL in the printer apparatus shown in FIG.
It is a flow chart which shows a program.

[Explanation of symbols]

 2 CPU (processing means) 4 ROM (first storage means) 6 EE / PROM (second storage means) 8 RAM (third storage means) 10 RS-232C interface (input means) 12 I / O port ( Input means) 14 Data loading switch 16 Reset circuit

Claims (1)

[Claims] 1. A first storage means for storing a write processing program for writing a program or data to be input from the outside, a processing means for executing the write processing program, and the write processing of the processing means. Input means for inputting the program and the data from the outside based on the execution of the program, and second storage means composed of a writable nonvolatile memory for storing the program and the data input through the input means A data processing device comprising: