JPS63282791A - Display control system - 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] [Summary] In a display control method of a character display device that can display n columns in each line of a display means, α columns are larger than n columns.
The +α column is stored as one line in the character buffer memory, and the n+α column is read out in units of one line to generate a character pattern signal and display ni. This allows horizontal scrolling to be performed without rewriting the contents of the character panzer memory, horizontal scrolling of unformatted screens with attribute information, and even when kanji characters are located at both ends of the screen. It is also possible to perform horizontal scrolling without causing any separation.

[Industrial application field]

The present invention provides a display control method for a character display device, in particular, converts horizontal scroll display processing into an hour wheel, enables horizontal scrolling of an unformatted screen with attribute information, and makes it possible to display kanji characters separately during horizontal scrolling. This invention relates to a display control method that prevents the occurrence of

[Conventional technology]

When displaying characters such as alphanumeric characters or kanji characters on a display and processing them in an interactive manner, the display screen is scrolled horizontally from left to right or vertically from top to bottom.

FIG. 12 is a block diagram showing the configuration of a conventional character display device that performs scrolling.

In FIG. 12, 21 is a character buffer memory in which character information codes for n×m characters displayed in n columns×m lines of the display are stored.

The character information code is composed of a character code indicating character pattern information and an attribute code (hereinafter referred to as Atri code) indicating character attribute information. Character attribute information includes, for example, reverse, blink, ruled line, etc.

22 is a write/read control means (R/W control means);
It controls the writing and reading of character information and information codes to and from the character panzer memory 21, and at the time of reading, the reading is performed line by line, with na being one line.

Reference numeral 23 denotes a character pattern J word generating means, which generates a character pattern signal to be displayed on the display based on n×m character information codes read line by line from the character buffer memory 21.

24 is a horizontal/vertical timing generation means (H/■ timing generation means), which generates a horizontal synchronization signal (H5ync signal), a vertical synchronization signal (V5ync signal), and each horizontal and vertical blanking signal (H-Blank signal,・Brand
k signal), display timing signal (Dsp Tm signal),
Each timing signal such as a vertical blanking end signal (VEND signal) is generated.

25 is a display means, which includes a display 251 inside;
In response to the character pattern signal from the character pattern signal generating means 23 and the H5ync signal, V5ync signal, etc. from the H-V timing generating means 24, the display 251
Displays n Q X m lines of characters.

26 is a host, which includes a CPU 261, a ROM 262 in which various control programs and initialization programs are stored, and a RAM 263 in which instructions and data being processed are stored;
It controls the operation of the system by transmitting and receiving character information codes, various data, addresses, and control signals.

A transceiver (TRV) 27 controls data transfer between the host 26 and the character buffer memory 21.

In the R/W control means 22, 221 is a character counter (
chr-CNT), is controlled by the VEND signal that is generated every time one vertical scan of the display screen ends, and the initial value of the address at the start of scanning, that is, the address value No. (fixed value) in the first row and first column. is set, and thereafter, in response to the character clock (cCLK) generated for each character, 2CCLK
(Note that the point that the count is increased every 2 CCLK will be explained in detail in the timing chart of FIG. 17, which will be described later).

222 is a multiplexer (MPX), chr.C
Each timing signal from the NT 221 and the H-V timing generation means 24 and the address from the CPU 261 are selected, and an address for accessing the character buffer memory 21 is output.

223 is a character buffer arbitration unit, 224 is a write address counter (W-AdCNT), and 225 is a marsupxa (MPX), which allows the character buffer memory 21
In each row, H/V timing generation means 24
Each character information code is read out in synchronization with the H5ync signal and the V5ync signal from the line bar of the character pattern signal generating means 23.

Furthermore, when displaying, each character information code is read out from the line buffer in synchronization with the H5ync signal and V5ync signal (the specific operation will be explained in the following operation explanation). ).

In the character pattern signal generating means 23, 231 is a line buffer in which character information codes for one line (column n) read from the character buffer memory 21 are temporarily stored.

Reference numeral 232 is a second register (first REG) in which character information code for one line read from the line buffer 231 is set.

233 is the second register (second REG);
The character code in the character information code set to 32 is set.

234 is the third register (third REG), and the first REG2
The Atri code in the character information code set to 32 is set.

235 is a character pattern generation unit that generates character pattern data corresponding to a character code.

236 is an attribute processing unit, and the first REG 232
Based on each Atri code from the third REG 234, character dot pattern data is generated by performing predetermined attribute processing on the character pattern data output from the character pattern generation section 235. The first REG 232 sends attribute information (field attribute code: F Atri code) common to a plurality of consecutive display characters to the attribute processing unit 236, and the third REG 234 sends the Atri code for the corresponding character code. Sent.

237 is a parallel/serial conversion unit (P/S conversion unit) that converts parallel character pattern data into a serial character video signal;
Output as a character pattern signal.

FIG. 13 shows a display screen displayed on the display 251 when n=80 columns and m=25 rows.

Each row consists of 80 columns, and a total of 2000 columns are displayed. Since one alphanumeric character is displayed per column, it is possible to display 2000 alphanumeric characters in total.

In the case of kanji, one character is displayed in two columns, so if kanji are included, the number will be less than 2000 characters.

FIG. 14 shows the structure of the memory area in the character buffer memory 21 when n=80 columns and m=25 lines shown in FIG. 13 are displayed. X'N' is 16
An address in bytes expressed in decimal, the first row address in one row, that is, the initial value N0 of Chr-CNT221
has been selected as address 1000.

Each character code and hetri code are 16 bits (=2
Byte = 1 word). Therefore, 141
j! The alphanumeric character information code that forms one character is 4 bytes (each including one character code and Atri code).
= 2 words). Further, the character information code of the Kanji characters forming one character in two columns is formed by 8 bytes (-4 words) each including two character codes and an Atri code. Note that the term "characters" below refers to the characters (alphanumeric characters, etc.) displayed in one column.

Next, the operation in FIG. 12 is changed to n=8 as shown in FIG.
Taking as an example a case in which the 0 column and m=25 rows are displayed, a description will be given with reference to the timing charts of FIGS. 15 to 17. In the character buffer memo 1J21, as shown in FIG. 14, the character code and Atri code of each column from the 1st line to the 25th line are stored in the area from address X "1000° to X"1F3F'. Ru.

Assume that horizontal scanning is performed 28 times per line, that even and odd fields are alternately displayed by increments, and that the vertical blanking interval is two lines (28H).

Therefore, if the horizontal scanning period is IH, the period of each row is 14H as shown in FIG.
Four horizontal scans are performed, and the total number of lines including the vertical blanking period is 27 lines.

The even and odd fields each have 27 lines, but since interlacing is performed, the period of the 26th line of the even field is selected to be 15H (see Figure 15).
(See a) and (b), where X' and N' indicate hexadecimal notation; the same applies hereinafter).

The V 5sync signal occurs at the beginning of the 26th row in odd fields, and in even fields, it occurs 0.5 H after the beginning of the 26th row due to interlacing (
(See Figures 15(a), (c), (d)).

The vertical blanking period is the period between the 26th and 27th lines, and the 1st to 25th lines are the display period (see FIGS. 15(a), 15(e)).

The VEND signal is a vertical blanking signal.
It is generated at the end of ing, that is, at the end of the 26th line (see FIGS. 15(a) and 15(f)).

Also, - the number per horizontal scanning line is 100a, that is, 1
00 characters, 80 of which are displayed, and the remaining 20 characters are used as the horizontal blanking period (H-Br
(on period of the ank signal). Therefore, H
-Blank signal and display timing progress (DspTn+
H-Branking = *DspT1
There is a relationship of 1 (the square is an inverted sign).

The H5ync signal rises at the end of the 82nd column and falls at the end of the 90th column (see FIGS. 16(b) and 16(p)).

With each timing relationship as described above, the H/V timing generation means 24 outputs Hsync, Vsync,
, H-Brank, V・BrankXVEND,
Each timing signal, etc., is generated.

In such a display and scanning system, when the scanning of an odd field is completed and the VEND signal is generated, Chr-
The address of CNT221 is the initial value N.

(=X “1000”) is set (Fig. 15(f),
(h) and FIGS. 17(c) and (e)).

FIG. 17 shows a timing chart at the start of the first horizontal scan in the first row. In each cycle shown in FIG. 4A, M is a cycle indicating a period during which the character buffer memory 21 can be accessed from the CPU 261. Txi (Txia, Txib
) is from the character buffer memory 21 to the relaxer sofa 231
This is the cycle in which the i5th character information code is transferred, Txia is the cycle in which the i-th character code is transferred, and Txib is the cycle in which the i-th Atri code is transferred. Also, P
MLOD is a parameter load cycle in which an address (initial value N
O) is set.

When the character buffer arbitration unit 223 receives a transfer command (VEND signal) from the HV timing generation circuit 24, it enables the write address counter (W-AdCNT) 224.

W-AdCNT224 has character code writing black 7 LBCK6 and Atri shown in FIG. 17(f) and (g).
A code write clock LBCK is alternately generated and supplied to the line buffer 231 via the character buffer arbitration unit 223 and MPX 225.

The character buffer arbitration unit 223 uses each write clock L
The MPX 222 is controlled according to the timing signals BCKo, LBCK, and Hsync and Vsync from the H・■ timing generation means 24, and the Chr・CNT
The character address from 221 and the refresh address from the H/■ timing generating means 24 are selected to address the character buffer memory 21. As a result, the character information codes 1 to 80@ on the first line are transferred from the character buffer memory 21 to the line buffer 231 by DMA transfer in synchronization with the Hsync and Vsync signals.

As a result, as shown in FIGS. 17(a), (d) to (g), the count value of Chr-CNT221 is N,
N0+2tNo+4t...,N (1+2
When p, O@th, 1st@th, 2nd column, etc.
The character code of the P item is written to the line buffer 231, N0+1, No +3 t No ” 5,...
...s N o +2 p ” When 1, 0f
j1st, 1@th, ......P event Atri
The code is written to line buffer 231.

In the line buffer 231, character codes and Atri codes are written separately and alternately in a stack format, and when reading, character codes and Atri codes in the same column are read simultaneously and consecutively.

Reading from the line buffer 231 is performed using the H
The signals are sequentially read out from the first column in synchronization with the sync signal and the Vsync signal and set in the first REG 232.

Next, taking column 80 as an example, the operation of the character pattern signal generating means 23 will be explained with reference to FIG.

Synchronizing with the end of the character video signal in the 76th column, that is, the rising edge of the H-Brank 1 signal, the P/S converter 237 converts the first REG 232 to 8 ([The character code in the first character information code is set to the second REG 233. is,
The Atri code for that character code is 3rd REG2
34, and the field attribute code (F-Atri code) regarding multiple shelves is sent to the attribute processing unit 236 (O in FIG. 16).
p)).

At the end of the character video signal in column 77, that is, H・Br
In synchronization with the rising edge of the ank 2 signal, the second REG2
The character code in columns 33 to 80 is character pattern generation part 2
35, and the character pattern data for the 80th column is generated (see Figure 16 (k), +11, (ρ)).
.

At the end of the character video signal in the 78th column, that is, H-Br
In synchronization with the rise of the ank3 signal, character pattern data and the Atri code are sent from the character pattern generation unit 235 and the third REG 234 to the attribute processing unit 236. The attribute processing unit 236
Attribute code sent from 233 and 3rd REG 234 and H from timing generation means 24
Performs predetermined attribute processing on the character pattern data based on the H5ync signal and the V5ync signal, and
It is output in synchronization with the nc signal and the V5sync signal (Fig. 16(m)).

(See (P)).

The end point of the character video signal in the 79th column, that is, H・Br
The DspTm signal is turned off in synchronization with the rising edge of the ank4 signal, and the H/■ timing generation means 24
A P/S load signal is then applied to the P/S converter 237. The P/S conversion unit 237 is the attribute processing unit 23
The parallel character pattern signals transferred from 6 are converted into serial character video signals and output.

The 80a-th character video signal is sent to the display means 25 and displayed on the display 251. A non-display period starts in synchronization with the end of the character video signal in the 80th column, that is, the rise of the H-Brank5 signal, the following 20 columns become non-display, and the display process using the -horizontal scanning line' ends.

Note that the display processing operation in the first column shown in FIG. 16 is clear from the previous explanation of the display processing operation for item 80a, so a detailed explanation thereof will be omitted.

Thereafter, by displaying characters in columns 1 to 80 in the same manner using 14 horizontal scanning lines for each first line, as shown in Figure 13, 2000 characters of 80 columns x 25 lines can be displayed. (See the timing chart in FIG. 15 (al to (h)).

When performing horizontal scrolling in the above display method,
The entire contents of the character buffer memory 21 are rewritten in accordance with the horizontally scrolled screen.

This is because the character information code for one line read from the character buffer memory 21 is the character information code for 80 columns displayed on the display 251, and the address of each character information code is fixed. .

[Problem that the invention seeks to solve]

In conventional character display devices, when performing horizontal scrolling, it is necessary to rewrite the entire contents of the character buffer memory. This complicates processing, and it is necessary to save data of character portions that extend beyond the screen to another memory.

Further, since the number of character information codes read from the character buffer memory is equal to the number of characters for one line that can be displayed on the display, it has been impossible to horizontally scroll an irregularly formatted screen containing attribute information. For example, in Figure 13, if the characters (A-D) in the 2nd to 5th columns are displayed in reverse, the field attribute (A-D) that instructs the character information code in the first row to display the subsequent characters in reverse is
The F-Atri) code is set, and the F-^tri code that instructs the end of reverse display is set in the character information code in the 6th column, but if you scroll one character to the left, 1
Since the 4tJ-th F.^tri code is ``NA'', reverse display of the second and subsequent characters will not be performed.

Furthermore, since kanji characters are displayed using two columns, twice as many as alphanumeric characters, they occupy two columns of space in the character buffer memory, and the first half and second half of the character information code are displayed in one column each. is stored in For this reason, if horizontal scrolling is performed when Kanji characters are located at both ends of the screen, so-called separation occurs, making it impossible to display the Kanji characters on the display screen. For example, in Figure 13, when the kanji character ``character'' is at the left end of the second line (columns 79 and 80), 1
Characters (column 1) When you scroll horizontally to the left, as shown in the third line, the 80a-th character information code corresponding to the left half of the kanji character ``character'' disappears, so a character code for the kanji character ``character'' is generated. It becomes impossible, and 4 is also added to the left end of the third row.
It is no longer possible to display the kanji character "character" at the right end of the line.

The present invention facilitates horizontal scrolling by eliminating the need to rewrite the contents of a character buffer memory when performing horizontal scrolling, enables horizontal scrolling of an unformatted screen that has attribute information, and enables kanji characters to be displayed at both ends. It is an object of the present invention to provide a display control method that does not cause separation during horizontal scrolling even in the case of horizontal scrolling.

[Means for solving problems]

The solution taken by the present invention will be explained with reference to FIG. FIG. 1 is a block diagram showing the basic configuration of the present invention.

In FIG. 1, reference numeral 11 is a character buffer memory, in which each column has an n+α column which has more α (α is an integer of 1 or more) columns than the genus (n column) that can be displayed in each line of the display means 15, and each column is The character information code including the character code for the character is stored. The value of α is appropriately selected based on the number of characters to be scrolled left and right, the number of attribute information associated therewith, and the like.

12 is a write/read control means (R/W control means);
It controls the writing and reading of character information codes to and from the character buffer memory 11, and when reading, successive reading is performed in units of one line in the n+α column.

13 is a character pattern signal generating means, which is a character pattern signal generating means;

A character pattern signal to be displayed on the display means 15 is generated based on each character information code read from the file memory 11 in units of one line of n+α columns.

Reference numeral 14 denotes a horizontal/vertical timing generation means (H/■ timing generation means), which generates timing signals for controlling each operation of the R/W control means 12, the character pattern signal generation means 13, and the display means 15.

[For production]

The effect of the present invention will be explained by taking as an example the case where the screen displayed on the display means 15 has n columns x m lines, α=2, and 1 @ is added to each of the left and right sides of one line, as shown in FIG. 2. explain. In this case, the genus of one line that can be displayed on the display means 15 is n, so n+2 is the genus of one line.

The character buffer memory 11 stores the character information code for the character n+2)Xm41jl, where n+2@ is one line.

The R/W control means 12 includes an H/■ timing generation means 14.
In response to a timing signal from the character pattern signal generating means 13, reading is performed in units of one line in column n+2 and transferred to the character pattern signal generating means 13.

The character pattern signal generation means 13 generates a character pattern signal to be displayed on the display based on the transferred character information code in the n+α column for one line and the timing signal from the H/■ timing generation means 14. send to As a result, characters of n columns x m lines are displayed on the display means 15, as shown in FIG. The item characters in each of the left and right columns, Oa and n+l columns, are not displayed due to horizontal blanking.

Next, the horizontal scrolling operation of the present invention will be explained.

Now, the alphabetic character A is in the 2nd to 5th columns of the 1st line.

It is assumed that B, C, and D are displayed in reverse, the alphabet PQR3 is displayed in columns n-3 to n, and the kanji character "Kanji" is displayed in columns n-3 to n on the second line.

When horizontally scrolling by one character (one column) to the right, the contents of the character information code part of the character buffer memory 11 can be rewritten by specifying the column before the O column of each line as the start address of each line. Instead, horizontal scrolling to the right by one character is performed.

As a result, the previous columns O to (n-1)a are displayed on the display. The 3rd and 4th lines are the 1st and 2nd lines.
This shows the display state when the row is horizontally scrolled by one character to the right. Even if the kanji character "character" on the second line is scrolled to a one character (one column) distribution, the nth character information code of the kanji character "character" before scrolling exists at the n+1ith character information code after scrolling, so It is displayed normally and no discrepancies occur. However, due to horizontal blanking, the kanji character "
The second half of the "character" is not actually displayed, and only the first half is displayed as shown.

Next, when horizontally scrolling the first line by one character (one column) to the left, the contents of the character information code part of the character buffer memory 11 are rewritten by specifying the item (g) of each line as the start address of each line. One character's worth of left horizontal scrolling is performed without any change.

As a result, the previous columns 1 to n+141jl are displayed on the display. The fifth line shows the display state when the first line is horizontally scrolled by one character to the left. Since the attribute information for the alphabetic characters A-D exists in the Oth comb which is not displayed due to horizontal blanking, the reverse attribute information is not lost and ABCD is correctly displayed in reverse even after scrolling.

By increasing the number of α, the number of characters to be scrolled left and right can be increased. When α=1, it is possible to scroll one character (one column) to the right (or left).

As described above, horizontal scrolling display can be performed without rewriting the contents of the character buffer memory 11, thereby simplifying the horizontal scrolling process. In addition, it is possible to horizontally scroll an irregularly formatted screen that has attribute information, and even when there are Kanji characters at both ends, it is possible to prevent separation from occurring during horizontal scrolling.

〔Example〕

Embodiments of the present invention will be described with reference to FIGS. 2 to 11. Fig. 3 is an explanatory diagram of the configuration of an embodiment of the present invention, Fig. 4 is an explanatory diagram of character panzer memory, Figs. 5 to 7 are operation timing charts, and Fig. 8 is a horizontal representation of characters with attribute information. An explanatory diagram of the scroll display operation, Figure 9 is an explanatory diagram of the character buffer memory in the case of Figure 8, Figure 10 is an explanatory diagram of the horizontal scroll display operation of Kanji characters, and Figure 11 is a diagram of the characters in the case of Figure 10. FIG. 3 is an explanatory diagram of a buffer memory.

(A) Structure of Embodiment In FIG. 3, character buffer memory 11, R/W
III m means 12, character pattern signal generation means 13
Regarding H・■ timing generation means and display means 1
5 is as explained in FIG.

The H/■ timing generation means 14 receives the H5sync signal, V
It generates various timing signals such as a 5sync signal, an H-Brank signal, a DspTn+ signal, an R/S load signal, and a parameter load signal (PM load signal).

The PM load signal is sent to a character counter (chr/CN), which will be described later.
This is a signal for loading an address value into T), and the P/S load signal is a signal for instructing a P/S converter, which will be described later, to perform parallel/serial conversion.

The display means 15 includes a display 151 therein, and displays the character pattern signal from the character pattern signal generation means 13 and )l 5ync from the H/■ timing generation means 14.
signal, V 5sync signal, H-Brank signal, V・
In response to the Blank signal, DspTw+ signal, etc., characters of n columns x m lines are displayed on the display.

16 is a host, which is equipped with a ROM 162 in which CPU 61 various control programs and initialization programs are stored, a RAM 163 in which instructions and data being processed are stored, and character information codes, various data, addresses, and control signals. Transfer, give and receive, and control the operation of the system.

A transceiver (TRv) 17 controls data transfer between the host 16 and the character buffer memo 911. - In the R/W control means 12, 121 is a character counter (
chr-CNT), the start address of each line to be transferred from the character buffer memory 11 is set under the control of the PM load signal, and thereafter in response to the character clock CCLK, the start address of each line is set.
Count amplify every CCLK.

122 is a multiplexer (MPX), Chr・CNT
121, select each timing signal from the H/■ timing generation means 14 and the address from the CPUI 61,
Outputs the address for accessing the character buffer memory 11.

123 is a character buffer arbitration unit, 124 is a write address counter (W-AdCNT), and 125 is a multi-brefter (MPX).
1, each character information code is read out in one line unit and in synchronization with the H5ync signal and V5ync signal from the H/■ timing generation means 14, and written into the line buffer of the character pattern signal generation means 13, Furthermore, during display, the H5ync signal and V5y are sent from the line buffer.
Read each character information code in synchronization with the nc signal.
(The specific operation will be explained in the following operation explanation).

In the character pattern signal generating means 13, a line buffer 131 temporarily stores the character information code for one line (n+α column) read from the character buffer memory 11.

Reference numeral 132 is a second register (first REG) in which character information code for one line read from the line buffer 131 is set.

133 is the second register (second REG), and the first REG1
The character code in the character information code set to 32 is set.

134 is the second register (third REG), and the first REG1
The Atri code in the character information code marked 32 is set.

135 is a character pattern generation unit that generates character pattern data corresponding to a character code.

Reference numeral 136 denotes an attribute processing unit, which generates character tone pattern data by performing predetermined attribute processing on the character pattern data input from the character pattern generation unit 135 based on each ^tri code from the first REG 132 and the third REG 134. . The first REG 132 sends attribute information (field/attribute code;
A tri code will be sent to you.

137 is a parallel/serial converter (P/S converter) that converts parallel character pattern data into a serial character video signal;
Output as a character pattern signal.

FIG. 4 shows the structure of the memory area of the character buffer memory 11 when n=80 columns and m=25 lines in FIG. 2. As mentioned above, α=2 and n
The +α=82 column is the number for one line.

In the character buffer memory 11, a character information code storage section 111 and a pointer table 112 are provided.

The pointer table 112 contains the address X'1ooo'.
~X" The start addresses of the 1st to 25th lines are stored at address 1030°.

In the character information code storage section 112, character information codes for items O to 81 in lines 1 to 25 are stored after address X'4000'. The character information code is formed of a 2-byte character code and an Atri code for each column, as in the conventional method.

The CPU 161 generates addresses in bytes, but since it accesses the character code and Atri code in the character buffer memory 11 in 2-byte units, twice the content of the row start address indicated by the pointer table 111 is the O of that row. This is the actual start address of the character information code for the event. Further, as in the past, one column of alphanumeric characters forms one character, and two columns of Kanji characters form one character.

(B) Operation of the embodiment The operation of the embodiment of FIG. 3 is as follows: n=804 in FIG.
Ijl, α=21. Taking as an example a case where m=25 lines, n+α'-=82 columns, and a display of (1st column to 80th column)×25 lines is performed, a description will be given with reference to FIGS. 4 to 7. As shown in FIG. 4, the pointer table 111 and character information storage section 112 of the character buffer memory 11 store the start address of each line and the character codes and Atri codes of columns 0 to 81 of each line.

It is assumed that horizontal scanning is performed 28 times per line, even fields and odd fields are alternately displayed by interlacing, and the vertical blanking return is two lines (28H). Therefore, if the horizontal scanning period is IH, the period of each row is 14H as shown in FIG. becomes.

The even field and the odd field each have 27 lines, but since increment is performed, the period of the 26th line of the even field is selected to be 15H (see Figure 5(a).
), see (b)).

The V 5sync signal occurs at the beginning of the 26th line in odd fields, and in even fields, it occurs 0.5 H after the beginning of the 26th line to perform increment (
(See Figures 5(a), (c), and (d)).

The vertical blanking period is the period between the 26th and 27th lines, and the 1st to 25th lines are the display period (see Figure 5 (al.
, (c1, (see el).

A PM load signal (PMLOD signal, PML, -P
ML□) is generated synchronously at the start of each row address. PM load signal PM indicating the first row start address
i is generated synchronously with the start of the i-1 row address (see FIGS. 5(a) and 5(f)). Then, from the character information code storage section 111 of the character buffer memory 11,
The reading of the i-th line is i-1, which is one line before the start of displaying the first line.
(Fig. 5, fa), (f
), (g), (see eyes).

Also, - the number of species per horizontal scanning line is 100 columns, i.e. 1
00 characters, 80 of which are displayed, and the remaining 20 characters are a non-display period. In this embodiment, as shown in FIG. 2, the extra 82 characters (824M) are read out as one line on the left and right sides of the display screen for 80 characters, so the H-Brank signal is 1). 1-22 characters (=18 characters (column 18)) (see Figure 6 (a) to (h), ip)), therefore,
There is a relationship between the H-Brank signal and the DspTm signal as follows: H-Brank+cr=DspTs+ (the circle is an inverted sign).

The horizontal synchronization signal Hsync rises at the end of the 82nd column,
It rises at the end of column 90 (Figure 6, (b), (p)
reference).

With the above-mentioned timing relationships, the H/V timing generation means 14 outputs Hsync, Vsyn,
Timing signals such as C, H-Brank, V-Brank, PM load, and DspTm are generated.

In this display and scanning method, the PM load signal PML is output after scanning of the odd field is completed.

occurs, the start address A (=X'2000') of the first line is determined from the pointer table of the character buffer memory 11
) is set in the Chr-CNT 121 (see FIGS. 5(f) and (h) and FIGS. 7(c) and (e)).

FIG. 7 shows a timing chart at the start of the first horizontal scan in the first row. The same figure (a
), M is a cycle indicating the period during which the character buffer memory 11 can be accessed from the CPU 161. Txi (Txia, Txib)
is a cycle in which the i-th character information code is transferred from the character buffer memory 11 to the line buffer 131, Txia is the i@-th character code, and Txib is i4!
This is the cycle in which the 12th Atri code is transferred.

Also, PMLOD is the parameter load cycle, PM
The load signal (PMLl) causes the row start address A of the first row to be set to the pointer table 111 of the character buffer memory 11.
The data is read from the Chr-CNT 121 and transferred to the Chr-CNT 121.

When the character buffer arbitration unit 223 receives a transfer command from the HV timing generation circuit (when the raster address LAI~4 is "0" at the falling edge of the H5sync signal), the character buffer arbitration unit 223 transfers the PMLOD
Outputs the write address counter (W-AdCN) signal.
T) enable 124.

The W-AdCNT 124 alternately generates the character code write clock LBCKo and the Atri code write clock LBCK+ shown in FIG. supply

If the buffer arbitration unit 123 locks each write
BCK, LBCK and H・■ timing generation means 14
MPX122 is controlled according to the H5ync and V5ync timing signals from Chr・CNT12.
Character address and H-V timing generation means 1 from 1
The character buffer memory 11 is addressed by selecting the row address LiNO~4 from 4 and the refresh address signal. As a result, each character information code in columns 0 to 81 of the first line is transferred from the character buffer memory 11 to Hsync,
It is transferred to the line buffer 231 by DMA transfer in synchronization with each Vsync signal.

As a result, as shown in FIG. 7(a), (d) to (g), the count values of Chr-CNT121 are A, A+
2゜A+4・・・・・・* When A+2 p, 0
Column, column, second column, etc., the character code for P items is line buffer 13. written to l, A+1
, A+3, A+5.・・・・・・p A ” 2 p
When +1, O sideways, 1st column, ......, Pi
The 11th Atri code is written to the line buffer 131.

In the line buffer 131, character codes and Atri codes are stored alternately and separately in a stack format, and when reading, character codes and Atri codes in the same column are read simultaneously and consecutively. .

Reading from the line buffer 131 is performed using the H
In synchronization with the sync signal and the V5sync signal, the signals are sequentially read out from the O row and sent to the first REG 132.

Next, taking column 80 as an example, the operation of the character pattern signal generating means 13 will be explained with reference to FIG.

Synchronizing with the end of the character video signal in the 76th column from the P/S conversion unit 137, the character code in the character information code in the 80th column is set from the first REG 132 to the second REG 133, and the Atri code related to that character code is set in the 3rd R.
The field attribute code (F-Atri code) related to multiple tanks is set in the EG 134 and sent to the attribute processing unit 136 (Fig. 6 U), (k
), see (p)).

77j/V1th character video signal end point, that is, H.
In synchronization with the rising edge of the Blankl signal, the second REG
The character codes from columns 133 to 80 are sent to the character pattern generation unit 135, and character pattern data for the 80th mth column is generated (see Figures 6(k), (1), and (p)).
.

At the end of the character video signal in the 78th column, that is, H-Br
In synchronization with the rise of the ank2 signal, character pattern data and the Atri code are sent from the character pattern generation unit 135 and the third REG 134 to the attribute processing unit 136. The attribute processing unit 136
133 and the third REG 134, and the H5ync signal and V5ync signal from the H-V timing generator 141, predetermined attribute processing is performed on the character pattern data, and the H5
It is output in synchronization with the sync signal and the Vsync signal (see FIGS. 6(b) and 6(p)).

79, the end point of the character video signal of the event, that is, H-B
In synchronization with the rise of the rank3 signal, the DspTn+ signal is turned off, and the H/■ timing generation means 1
4, the P/S load signal is applied to the P/S converter 137. The P/S conversion unit 137 is the attribute processing unit 1
The parallel character pattern signals transferred from 36 are converted into serial character video signals and output.

The character video signal in the 80th column is sent to the display means 15 and displayed on the display 151. A non-display period starts in synchronization with the end of the 80a-th character video signal, that is, the rise of the H-Brank4 signal, the following 20 columns become non-display, and the display process using the -horizontal scanning line ends.

The character code and ^tri code in column 81 are in the 2nd REG.
133 and the third REG 134, but they are not displayed, so no character pattern generation processing is performed. To horizontally scroll one character to the left, use this 8111jl
A character pattern is generated by the character code of the eye. H-
The Blank5 signal is for the character in the 81st column.

Note that the display processing operation in the first column shown in FIG. 6 is clear from the previous explanation of the display processing operation in the 80th column, so a detailed explanation thereof will be omitted.

In the same way, for each 1st line, 14 years horizontal scanning display is performed.
By displaying the characters ~1804511, 8 Q
llJx 25 lines of 2000 characters are displayed.

(See Figure 5 (a) - (fit timing chart))
.

Note that the 0th column and the 81a-th column are not displayed because they are within the period in which the DspTm signal is off.

(c) Scroll Display Operation of Embodiment The scroll display operation in the embodiment of FIG. 3 will be explained separately into a scroll display operation for characters with attribute information and a scroll display operation for kanji characters.

(c-1) Scroll display operation of characters with attribute information Taking as an example the case where the attribute information is reverse display, the scroll display operation of characters with attribute information will be explained with reference to FIGS. 8 and 9.

Figure 8 (A) shows the alphabetic characters A and B in the 2nd to 5th columns of the 1st line.
, C, and D are displayed in reverse, and FIG. 9 shows the pointer table 112 and character information code storage section 111 in the character puffer memory 11 in that case.
This shows the contents of the first line of .

In FIG. 9, X"100 of the pointer table 112
X'1FFE' at address 0' as the start address of the first line
If , the character information code storage section 1
Items after address X'3FFC' of 11 are the character information codes for each column on the first line. That is, the character information code for the OMA-th character E is at addresses X'3FFC' and '3FFE', the character information code for the first column is at addresses X'4000' and X'4002', and the character information code for the first column is at addresses X'4004° and
Address 4006' has the character information code for character A in the second column, addresses X'4008' and x°400A' have the character information code for character B in the third @ column, and
At addresses C' and X "400B", the character information code for the character C in the fourth column is X "4010" and
'The character information code for the 5th @ character is in the address.
The character information code in the sixth column is stored at addresses X"4014° and X"4016', respectively.

To display the characters A, B, C, and D in the 2nd to 5th columns in reverse, use X'4000 as the character information code in the 1st column.
The F-Atri code is stored at address 'X'4002' and the reverse code is stored at address X'4002'.

Also, as the character information code in the 6th column,
An F-Atri code is stored at the address, and a default code indicating no attribute is stored at the address X"4016°.

Note that the pointer table 112 and character information code storage unit 111 also store start addresses and character information codes regarding other columns in the first row and columns in each other row, but are not shown.

By using the pointer table 112 and the character information storage unit 111 shown in FIG. 9 and performing the display processing described in the above section (B), the first line of the display 151 displays the information shown in FIG. 8(A). As shown in the figure, the characters A, B, C, and D are displayed in reverse in the second to fifth columns. However, the character E in the 0th column is not displayed because it is within the non-display period.

Next, when scrolling characters A to D by one character to the right, the contents of the character information code storage section 111 shown in FIG. 9 remain unchanged, and the contents of each start address of the pointer table 112 are decreased by two addresses Rewrite it as For example, the content of the start address in the first line at address X"1000° is rewritten from address X"IFFE" to address X"1FFC'. This rewriting process is C:PUl 6
1.

As a result, the start address of the 0th column of the first line becomes the address is the character information code after scrolling.

Therefore, using this character information code storage section 111 and the rewritten pointer table 112, the above-mentioned (B
By performing the display processing described in section ), right horizontal scrolling for one character is performed, and as shown in FIG. The characters A-D are displayed in reverse.

Conversely, when scrolling characters A-D one character to the left from the state shown in FIG. 8(A), the contents of the character information code storage section 111 shown in FIG.
The contents of each of the 12 starting addresses are rewritten so that they are two addresses larger. For example, 1 at address X"1000°
The contents of the start address in the row are rewritten from address X"IFFE" to address X"2000°.

As a result, the start address of the O item on the first line becomes address X "4000'" in the character information code storage section 111, and from now on, the start address of each column increases by 4 addresses, and the character code of the next column becomes This is the character information code after scrolling.

In column 0, the F-Atril-code and reverse code of address X'4000° remain as character information codes, so
Reverse processing for characters A to D after scrolling is performed correctly.

Therefore, using this character information code storage section 111 and the rewritten pointer table 112, the above-mentioned (
By performing the display processing described in section B), one character is horizontally scrolled to the left, and characters are displayed in columns 1 to 4 on the first line of the display 151, as shown in FIG. 4(c). A to D reverse display is performed.

If the number of added genus α is increased, it is possible to perform left horizontal scrolling for even more characters. The same holds true for right horizontal scrolling.

As described above, scrolling display can be performed without rewriting the contents of the character information code storage section 111 (by simply rewriting the contents of the pointer table 112,
In addition, since attribute information such as reverse information is not lost, it is possible to display the same attributes after scrolling as before scrolling.

(c-2) Horizontal scroll display operation of Kanji characters The horizontal scroll display operation of character strings including Kanji characters will be explained with reference to FIGS. 10 and 11.

Figure 10 (A) shows columns 1 to 2 of the first row and columns 79 to
This is an example in which the Kanji character "A" is displayed at position 80a and the English character rAJ is displayed in the third column. FIG. 11 shows the character information code storage section 111 and This shows the contents of the first line of the pointer table 112.

In FIG. 11, X'10 of the pointer table 112
X'1FFE at address 00' as the start address of the first line
If ' is set, the characters from address X'3FFC' in the character information code storage section 111 become the character information codes for each column on the first line. That is, X “3FFC”
and X"3FFB', the character information code for the character F is located at addresses X'4004' and X'4006', the lower character information code for the same kanji character "A" is located at
The character information code of the alphabetic character rAJ is stored at addresses 08' and X"40QC', respectively.
Addresses 4140' and X'4i2' have character information codes above the kanji character 'A', X'4144' and X'414.
The lower character information code of the same Kanji character "A" is stored at the address "6", and the character information code of the alphabetic character rXJ is stored at the addresses X"4148' and X"414A".

Note that the character information code storage unit 111 and pointer table 112 also store start addresses and character information codes regarding other columns in the first row and columns in each other row, but are not shown.

10 (A ), the characters "A", "A", and "A" are displayed in the 1st to 80th columns. However, the alphabetical character F in the 0th column is not displayed because it is within the non-display period.

Next, when these display contents are scrolled one character to the right, the contents of the character information code storage section 111 shown in FIG. Rewrite it as For example, the contents of the start address in the first line at address X"1000' are from address X"I FFE" to X'1FF
It is rewritten to address C'. This rewriting process
This is done by U161.

As a result, the start address of the first line next to O becomes the address X"3FF8' of the character information code storage section 111, and from then on, the start address of each column decreases by 4 addresses, and the character information code of the previous column becomes is the character information code after scrolling.

In this case, the upper character information code of the rightmost kanji character “A” at addresses X “4144’ and X “4146” is 80.
Since the lower character information code is entered in the 81st column, the rightmost Kanji character "A" is correctly reproduced.

Therefore, using this character information code storage section 111 and the rewritten pointer table 112, the above-mentioned (
By performing the display processing described in section B), right horizontal scrolling for one character is performed, and 1 of the display 151
In the li-th row, as shown in FIG. 8(B), the rFJ
However, "A" is displayed in the 2nd column and the 3rd WA, and the first half of "A" is displayed in the 80th column. Note that the second half of "A" in the 81st column is not displayed because it is within the non-display period.

In this way, the first half of the kanji character "A" can be displayed without causing separation due to horizontal scrolling.

Conversely, when scrolling one character to the left from the state shown in FIG. 10(A), the character information code storage section i11 shown in FIG.
The contents of each start address in the pointer table 112 are rewritten so as to be larger by two addresses, while leaving the contents as they are. For example, the content of the start address of the first line at address X"1000" is X"l FFE 'from address X'
It is rewritten to address 2000'.

As a result, the starting address in the 0 column of the first line is address X "4000'" of the character information code storage section 111, and the following is as follows.
The start address of each column increases by four addresses, and the character information code of the next column becomes the character information code after scrolling.

In this case, the upper character information code of the rightmost kanji character "A" at addresses X'40QO° and X"4002° is 0W.
Since it is in the A category and the lower character information code is in the L category, the leftmost Kanji character "A" is correctly reproduced.

Therefore, using this character information code storage section 111 and the rewritten pointer table 112, the above-mentioned (
By performing the display processing described in section B), left horizontal scrolling for one character is performed, and 1 of the display 151
As shown in Figure 8(c), in the tith row, the last half of "A" is in the tith column, rAJ is in the second column, "Ai" is in the 78th and 79th columns, and rXJ is in the 80th column. are displayed respectively.

Note that the first half of "A" in column 0 is not displayed because it is within the non-display period.

As described above, scrolling display can be performed simply by rewriting the contents of the pointer table 112 without rewriting the contents of the character information code storage section 111.
In addition, even if there are Kanji characters at both ends, the first half or the second half can be displayed without causing any separation. By displaying the first half or the second half in this way, it is possible to estimate the content of the entire Kanji character, which is convenient.

Although one embodiment of the present invention has been described above, the embodiment of the present invention is not limited to this embodiment. genus n
The number of two lines m and the number of additional columns α are n=30, m=25. α=2
can take other values. The pointer table may be provided in cases other than character buffers, and the transfer of character information codes is not limited to DMA transfer.

Further, the character information code may be only a character code, and also includes only information codes related to attributes, such as addresses X"4000" and X"4002' in FIG. 9.

〔Effect of the invention〕

As explained above, according to the present invention, the following effects can be obtained.

(b) Horizontal scrolling display can be performed without rewriting the contents of the character buffer memory.

Therefore, horizontal scroll processing can be simplified.

(b) It is possible to horizontally scroll an unformatted screen that has attribute information.

(c) Even when kanji characters are located at both ends of the screen, horizontal scrolling can be performed without causing separation.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the basic configuration of the present invention, FIG. 2 is an explanatory diagram of the scroll display operation of the present invention, FIG. 3 is an explanatory diagram of the configuration of an embodiment of the present invention, and FIG. 4 is an explanatory diagram of the same embodiment. FIG. 5 is an overall operation timing chart of the same embodiment. FIG. 6 is an operation timing chart of the horizontal scanning end and start operation portions of the same embodiment. An operation timing chart of the scanning start part of one horizontal scanning line. Figure 8 is an explanatory diagram of the horizontal scroll display operation of characters with attribute information in the same embodiment. Figure 9 is a horizontal scroll display operation of characters with attribute information in the same embodiment. FIG. 10 is an explanatory diagram of the horizontal scroll display operation of Kanji characters in the same embodiment. FIG. 11 is an explanation of the character buffer memory during the horizontal scroll display operation of Kanji characters in the same embodiment. 12 is an explanatory diagram of a conventional character display device; FIG. 13 is an explanatory diagram of a display method of a conventional character display device; FIG. 14 is an explanatory diagram of a character buffer memory of a conventional character display device; The figure is an overall operation timing chart of a conventional character display device, FIG. 16 is an operation timing chart of the horizontal scanning end and start portion of a conventional character display device, and FIG. 17 is an operation timing chart of one horizontal scanning line of a conventional character display device. It is an operation timing chart of a scanning start part. 1 and 3, 11...Character buffer memory, 12...Writing/reading (R/W) control means, 13...Character pattern signal generation means, 14...Horizontal/vertical ( H・■) Timing generation means, 15... Display means, 16... Host,
111...Character information code storage unit, 112...Pointer table, 121...Character counter (chr-C
NT), 131...line buffer, 151...
display.

Claims (2)

[Claims] (1) In a display control system of a character display device that can display n columns in each row of the display means (15), (a) the number of columns (n columns) that can be displayed in each row of the display means (15) is larger than α( (α is an integer greater than or equal to 1) A character buffer memory (11) in which character information codes including character codes for characters in each field are stored, with the number of columns (n+α) as one line; (b) character buffer memory (11); (c) a write/read control means (12) that controls writing and reading, and reads in units of one line from the n+α column during reading; (c) reads each line in the n+α column from the character buffer memory (11) character pattern signal generation means (13) for generating a character pattern signal to be displayed on the display means (15) based on each character information code issued; (d) writing/reading control means (12); character pattern signal generation means; A display control system comprising: horizontal/vertical timing generating means (14) for generating timing signals for controlling each operation of the means (13) and the display means (15). (2) A pointer table (112) indicating the start address of each line in the character buffer memory (11);
Based on the instructions in this pointer table (112),
2. The display control system according to claim 1, wherein the write/read control means (12) reads each line from the character buffer memory (11).