JPH02289003A - document creation device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a document creation device that rewrites a video RAM without any problems in connection with driving a carriage drive motor, etc. that constitute a printing device. It is something.

(Prior Art) Conventionally, for example, input data entered using a keyboard or the like is edited while being displayed on a raster type CRT, and the edited input data is printed using a printing device. In a document production device that has the function of
Due to the need to simultaneously execute AM (hereinafter abbreviated as VRAM) relocation control, the CPU for controlling the printing device
It had two CPUs: a CPU (central processing unit) and a CPU for the display control circuit.

(Problems to be Solved by the Invention) However, in the conventional example, two CPUs are required, one for controlling the printing device and the other for controlling the display, which is a factor that hinders cost reduction.

In order to solve this problem, it is conceivable to simultaneously process the two controls using one CPU, but this causes the following inconvenience.

That is, a document creation device such as a word processor is required to print input data and change the CRT display screen at the same time. At this time, the rewriting process of the VRAM and the output of various drive motors of the printing device are required. Phase update processing will be executed. However, VRAM
Due to the rewriting process, the timing of the pulse update process of the drive motor is delayed, and the pulse width is disturbed, which may cause the drive motor to step out.

Furthermore, the rewriting processing of the VRAM is executed during the vertical retrace period (hereinafter referred to as retrace period), but in order to avoid overlapping of the pulse signals, the driving If motor control is prioritized (because the main purpose of a document creation device is to print out documents), it is necessary to perform VRAM rewrite processing (wait) until the retrace period, and the If the retrieval period becomes longer, data rewriting may not be completed within the retrace period. In this case, the VRAM rewriting process continues even after the retrace period ends, resulting in flickering of the CRT screen display. occurs.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to reduce the stress and create intersecting circles without step-out of the drive motor or flickering of the CRT screen.
The purpose is to provide fff1.

(Means for Solving the Problems) In order to achieve the above object, the first invention provides a function for editing input data input using a keyboard or the like while displaying it on a raster type CRT, as shown in FIG. 1A. This is a document creation device in which a single control device controls the functions of printing input data after editing using a print position, and includes a video RAM for displaying input data on a CRT, and a drive motor for the printing device. Determining whether or not the drive motor is being driven [-] A drive state detection means, and based on the detection result, changing the maximum value of 8 of the rewrite data in the video RAM between when the drive motor is being driven and when it is stopped. The rewrite data over-switching means is provided.

The drive motor of the printing device may be a carriage drive motor, a character selection motor, a ribbon feed motor, a ribbon lift motor, a paper feed motor, or the like.

Further, as shown in FIG. 1B, the second invention is a document creation device having a part of the same configuration as the first invention, in which a carriage drive motor for moving a carriage constituting the printing device is a repeater. motor repeat operation determining means for determining whether or not the carriage drive motor is in operation; a predetermined area designated within the video RAM; Rewriting area determining means for determining whether or not a requested rewriting area of the video RAM is a designated predetermined area when the drive motor is in repeat operation; and a rewriting area is specified by the determining means. If it is determined that the rewriting area is a predetermined area, the rewriting execution means rewrites the data in the rewriting area.

(Operation) The first invention provides the above-mentioned rewrite data switching means,
The rewriting data of the video RAM 105 is executed by setting the last rewriting data that will not cause the drive motor of the printing device to step out, depending on whether the drive motor is in operation or stopped.

In the second aspect of the invention, since a predetermined area corresponding to the rewriting data suspension in which the carriage drive motor does not step out during the repeat operation is specified in advance, the carriage drive vJt
During the repeat operation, only the rewrite data in the predetermined area is rewritten by the rewrite area determination means and the rewrite execution means.

(Effects of the Invention) As explained above, the first invention sets rewrite data in an amount that does not cause a step-out in driving the printing device and rewrites the flyer 2 O RAM. Even when the printing device and the CRT display are controlled by one control device, even if the pulse output processing to the drive motor and the video RAM one-time replacement processing overlap, the video RAM rewriting processing is performed by the drive [- Since the motor does not reach 115211 m%, the drive motor will not step out even if the pulse width is slightly disturbed.

In addition, by reducing the number of rewrites to the video RAM while the drive motor is operating, after pulse processing to the motor,
Even if the video RAM rewriting process is executed, the rewriting process is completed within the retrace period, so the phenomenon of screen flickering does not occur.

The second invention is configured such that only a predetermined area in the bidet JRAM is rewritten during the repeat operation of the carriage drive motor. , the amount of rewritten data that does not cause the carriage drive motor to step out is sure to be increased. Therefore, even when controlling the printing device and controlling the display of C[k]- by one control device, the carriage drive motor does not step out. You can also use video RAM at any time.
Therefore, the video RAM is not rewritten beyond the - return tlAII interval, and CR "
There is no screen flickering phenomenon.

(Example) Hereinafter, an example of the document creation device according to the present invention will be described.
This will be explained with reference to the drawings.

This device has an electronic typewriter 2 equipped with a Rusk type CRT display (hereinafter simply referred to as CRT) as a display device.
4 are connected. The CRT 4 includes a display screen 6 on which document data and frames are displayed.

lyJ electronic electronic typewriter 2 Can be used alone without using CRT4 [■It is possible to use keyboard 8
and a printing mechanism 10. Keyboard 8 has
A character key 12 for inputting alpha I bets, numbers and various symbols, a space key 16 for moving the gear ridge 14 to the right by one character, which will be described later, a return key 18 for instructing a change, and the display screen of the CRT 4. A large number of function keys such as a cursor movement key 20 for moving a cursor indicating an input position on the screen 6 vertically and horizontally are arranged.

The printing mechanism 10 includes a platen 21 that supports printing paper (not shown) and a carriage 14 that is movably supported along a pair of guide bars 22 that are provided parallel to the platen 21.
It is equipped with The gear ridge 14 includes a daisy wheel 23, a type selection motor (not shown) for arranging the type on the daisy wheel 23 at the printing position, and a printing hammer 24 for hitting the back side of the type placed at the printing position. A ribbon cullet 25 containing the printing ribbon, a ribbon winding motor (not shown) for winding up the printing ribbon, and the like are mounted. Further, the carriage 14 is reciprocated via a timing belt 27 by a carriage drive motor 26 consisting of steps.

Next, the control system of such an apparatus will be explained based on FIG. 3.

This control system is a control system based on microphone code data configured using one CI U 30.

The CPU 30 is controlled by a system program in a ROM 31 and is connected to the keyboard 8 via a port wrap 33.
Input data is input from. If this input data is data that requires driving each of the step motors (only the carriage drive motor 26 is shown in FIG. 3) constituting the printing mechanism 10, CF, ) U 30 is the motor operation. The program is started and a motor operating pulse is output to the step motor via the boat latch 33 and the seventh motor driver 34 to drive the step motor.

Further, if the human input data is data that requires a display change on the CRT 4, the CI-'U 30 starts a display change program, sends the changed data to the video RAM 38 via the bus driver 42, and transfers the data to the video RAM 38. RAM
Write to 38.

The data written to the video RAM 38 is transferred to the character generator (CG) 3 by the CRT controller 36.
9 raster address, and the designated raster patterns 1 to 1 are input to the parallel-to-serial converter (shift register) 40 in the form of parallel data. Then, it is converted into serial dot pattern data by the parallel/serial converter 40 and inputted to the video control 41.

The video control 41 synthesizes the input dot pattern data and the video signal supplied from the CRT controller 36 to form a display signal and controls the display screen 6 of the CRT 4.

The RAM 32 includes a text memory into which data entered manually using the keyboard 8 is written, as well as various necessary buffers. , registers, counters, etc. are provided.

The video F (AM38) is a Bano 7 memory that has a memory address that corresponds one-to-one with the display address on the display screen 6 for data for one screen displayed on the CRT 4.The memory capacity for one character is It is 2 bytes, and stores display data using predetermined code data.The display data also stores attribute data such as underlining in addition to character data.

The CR1 controller 1 to the roller 36 are units for displaying characters, etc. on the CR display 4, and supply memory addresses of predetermined upper pits necessary for display to the video RAM 38 via the address multiplexer 37. with C
The raster address of a predetermined lower pit is supplied to G39. Further, the CR1' controller Ll-ra 36 connects the horizontal retrace line H8 to the CRT board of the video control 41.
Both the YNC and vertical retrace VSYNC timing signals are directly supplied.

In the CG 39, display character data is stored as binary data in pixel units, and the selected 4-character data is determined by the code stored in the video RAM 38. Then, 4 character data corresponding to the code stored in the legal address of the video RAM 38 is sequentially outputted to the input address.

Next, the data write sickness of the bidet and tRAM 38 will be explained based on 7 [coach yard] in FIGS. 4 and 5.

The routine shown in FIG. 4 is executed by a predetermined timer interrupt. First, J3 is in the step 81 (hereinafter simply referred to as Sl. The same applies to other steps), and it is determined whether data has been input by key operation on the 4-knee board 8, and the process continues until the data is input. This process is repeated. When the data is entered manually, the determination in Sl becomes Yes, and then in step 82, it is determined whether the data content is data that requires motor operation.

If motor operation is required, turn ON the motor operation flag in G3, set motor operation parameters such as the number of steps, damping count, and pre-excitation time in G4, and start the motor. Start driving.

This motor is driven by executing the interrupt process shown in FIG.

When this motor operation interrupt process is started, first in 820 it is determined whether or not the operation of the carriage drive motor 26 has ended. If the determination at 320 is No, -t, that is, the operation of the carriage drive motor 26 has not been completed, then at 821, the motor 26 is driven in accordance with the motor disturbance parameter. Then, when the necessary operation of the motor 26 is completed, the t-evening operation flag is turned OFF through the process of 322.

In step 321, the CPtJ 30 outputs a predetermined control command to the data bus and address bus.

Then, this output data is latched in the boat latch 33. Therefore, after this, the motor driver 34 drives the t-rail 26 in accordance with the control data latched in the boat latch 33.

When this motor operation interrupt processing is completed, the next step is 8 in Fig. 4.
5 is executed. This process is a process for determining whether or not it is necessary to change the display of CRI 4. That is, if the input data is data that requires motor operation and data that requires a change in the display screen of the CRT 4, the determination in S5 is Yes. Also, if this determination is No, that is, the input data is CRT4
If there is no need to change the display, the process returns to Sl.

If the determination in S5 is Yes, it is determined in the next step 86 whether or not the motor operating flag is ON, and if the motor is operating, the motor operating flag is still ON. , the determination at S6 is Yes.

In this case, the process of $9 is executed next, and the value of L/M is stored in accumulator A. Here, the video RAM (hereinafter referred to as ■RAM) 3 is
M is the maximum value of the amount of data that can be rewritten by 1 of 8, and M is the maximum value of the data amount that can be rewritten during the operation of the motor. However, it is set to satisfy the following conditions: L>M and L=nM (n is an integer). The value of M is determined by the pulse output processing for the control data of the motor 26 and the VRA
The amount of data is such that even if the rewriting process of M38 overlaps, the motor 26 will not step out.

That is, while the motor is in operation, the amount of rewritable data when the motor 26 is stopped is divided into n equal parts, and the data amount of each negative group is changed by N every retrace period.

This process is executed by processes 811 to 814.

811 is a waiting process for the arrival of the retrace period, and has the timing of the vertical retrace period based on the timing signal output from the CRT controller 36. Then, when the retrace period arrives, in the next step 812, the VRAM 38 is rewritten by the amount of rewrite data corresponding to the M. Then, in 313, the value of accumulator A is decremented, and in 814, it is determined whether the result is O or not.

Through the processing of steps 811 to 814, the required VRA
The rewriting of M38 is performed every M data during the arrival of n retrace periods. Therefore, even when the motor 26 is in operation, the motor 26 does not step out and the VRAM 3
8 can be rewritten.

Further, since the rewriting process of the VRAM 38 is executed by a predetermined number M every time the retrace period arrives, the rewriting process is not performed beyond the retrace period, and the screen 6 of the CRT 4 does not flicker.

In addition, if the motor operation ends (motor operation flag is 0FF) before entering the retrace period, or during the retrace period (Yes in S10), the process moves to 815,
VRAM for all rewritten data during blanking period
Execute 38 rewrites.

Then, return to Sl.

Next, in S6, the C1 motor operation flag is set to OFF.
If the result is F, that is, if the motor 26 is stopped, the determination in S6 is N.

Then, the processes 87 and 88 are executed. When this motor 26 is stopped, the rewriting process of the VRAM 38 will not cause the motor 26 to step out, so it is necessary to rewrite the entire amount of data corresponding to - during the retrace period. I can do it.

As described above, according to the document creation device according to this embodiment, 1
Even when configured using two CPUs, the VR within 11 questions of the return line of - times when the motor is stopped and when it is in operation.
By switching the AM rewrite data amount, the motor will not step out, and the CRT screen will not flicker.

In the above embodiment, only the carriage drive motor was used as an example of the step motor, but this control also applies to step motors such as the type selection motor, ribbon feed motor, ribbon lift motor, paper feed motor, etc. related to printing operation. It is aimed at.

Next, an embodiment of the document creation device according to the second invention will be described according to the flowcharts of FIGS. 6 and 7. In this figure, the same processes as those in FIGS. 4 and 5 are denoted by the same reference numerals, and the explanation thereof will be omitted.

In FIG. 6, if input data is input by operating the keyboard 8 and the content of the input data requires operation of the carriage drive motor 26, the process of 830 is executed. The process of S30 is a process of determining whether or not the input horn data requires a carriage repeat (hereinafter abbreviated as CA repeat) operation. If the result of this determination is Yes, then the CA repeat operation flag is turned ON in step 831. Also,
If the determination in S30 is NO, then by the process in 83,
Turn on the motor operating flag.

Then, in step 84, necessary motor operation parameters are read, and the motor operation interrupt process shown in FIG. 7 is executed.

This motor interrupt processing is performed by adding CA to the routine processing shown in FIG.
Processes 840 to 42 regarding repeat operations are added. The repeat operation of the carriage drive motor 26 is as follows:
Since precision is required, it is necessary to completely prevent the motor 26 from losing synchronization.

Therefore, in the motor operation interrupt processing, 840 to 84
2 are provided. S40 is a process for determining whether the CA repeat operation has ended or not. If it has not ended yet, the CA repeat operation process is executed by the process 341. If the CΔ repeat operation has been completed, the CA repeat operation flag is set to O by the process of 842.
Make it FF. The processes 820 to 822 are the same as the processes shown in FIG.

When this motor operation interrupt process is completed, the process 85 in FIG. 6 is executed next. Here, if it is determined that the display of the CRT 4 needs to be changed, then the process of 86 is executed,
Wait until the motor operating flag becomes OF[. If the motor control command output process is completed during this time, 3 in Fig.
Since the motor operating flag is turned off in step 22, the determination in step S6 is NO, and the next step 832 is executed.

832 is a process of determining whether or not the CA repeat operation flag is ON, and if this determination is Yes,
Next, the process of 833 is executed.

This 833 is the rewrite data of V RAM 38.
This is a process of determining whether or not it matches a predetermined area designated in advance. This designated predetermined area is such that even if the carriage drive motor 26 is in repeat operation and the pulse output processing for the control command and the rewrite processing overlap, the motor 26 will not step out. This is an area whose data capacity is determined. For example, this is a display part that is always displayed during carriage repeat operation and changes sequentially as the carriage (cursor) moves. For example, there is a part displayed on the CRT screen 6).

As the determination method in 832, the line display is
Since the display position is fixed, it can be determined by the address in the VRAM 38.

That is, the line display position on the CRT screen 6 and the VRAM
Since there is a one-to-one correspondence with the address of No. 38, if the address of the requested old replacement data corresponds to the line display, it can be determined that it is the rewrite data of this line display data.

Then, if the determination in 833 is Yes, the arrival of the retrace period is waited for by the processing in S7, and in 834, the VRA
Execute the rewriting process of M38.

At this time, it is the predetermined area (data area of line display) that is changed by 8.

If the determination in S33 is No, that is, if the rewrite data requested during the repeat operation of the kill ridge drive motor 26 is not for the predetermined area, the process proceeds to S6.
The process returns to step 332 and waits for the completion of the carriage repeat operation. That is, during the carriage repeat operation, rewriting of the VRAM 38 is only permitted to rewrite the line display.

Therefore, during the carriage repeat operation, only the line display of the f-9 amount that does not cause the carriage drive motor 26 to step out is changed.

And if the carriage repeat operation has finished (
If the motor operation has also ended), the determination at 832 is No, and the retrace period is completed at S7.
VRAM 38 (7) Execute aiN-e processing. The rewritten data at this time is not limited to the line display, but is all the requested rewritten data.

As described above, according to the document creation device according to this embodiment, 1
Even when configured using two CPUs, regarding the VRAM rewriting process during carriage repeat operation,
By setting a predetermined area in the data area where r11 key does not occur and executing the rewrite process only when rewriting of this area is requested, there is no chance of Tanabata losing synchronization during carriage repeat operation. . Furthermore, rewriting processing that exceeds the retrace period of - times is not performed, and the occurrence of flickering on the CRT screen can be prevented.

[Brief explanation of drawings]

FIG. 1A is a block diagram of the first invention, FIG. 1B is a block diagram of the second invention, FIG. 2 is an external view of the document creation device according to the present invention, and FIGS. Figures 6 and 7 are flowcharts showing the configuration of an embodiment of the second invention. 2... Electronic typewriter 4... CRT display 6... Display screen 8... Keyboard 10... Printing mechanism 14... Carriage 26...Carriage drive at once 30...
・CPU 31...ROM 32...RAM 36...CRT controller 38...Video RAM 41...Video control Figure 1A

Claims (2)

[Claims] (1) A document creation device in which a single control device controls the functions of editing input data inputted using a keyboard or the like while displaying it on a raster type CRT, and printing the input data after editing using a printing device. and a video R for displaying the input data on the CRT.
AM; motor drive state detection means for determining whether or not the drive motor of the printing device is being driven; and based on the detection result by the motor drive state detection means,
A document creation device comprising: rewrite data amount switching means for changing the maximum value of the amount of rewrite data in the video RAM between when the drive motor is being driven and when the drive motor is stopped. (2) A document creation device in which a single control device controls the functions of editing input data input using a keyboard or the like while displaying it on a raster type CRT, and printing the edited input data using a printing device. and a video R for displaying the input data on the CRT.
AM; motor repeat operation determining means for determining whether or not a carriage drive motor for moving a carriage constituting the printing device is in a repeat operation; and data that can be rewritten while the carriage drive motor is in a repeat operation. a predetermined area specified in the video RAM so as to correspond to the amount, and whether a rewriting area of the video RAM requested when the carriage drive motor is in repeat operation is the specified predetermined area. rewriting area determining means for determining whether or not the rewriting area is the specified area; rewriting execution means for rewriting data in the rewriting area when the rewriting area determining means determines that the rewriting area is the designated predetermined area; A document creation device comprising: