JPS6339062B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention converts processing information from a computer or the like into a pattern corresponding to the processing information at the generation part of characters, lines, kanji, etc., and displays the pattern on a cathode tube.
This paper relates to a kanji pattern reading method used when printing with a printer.

For example, kanji codes for displaying kanji patterns generally consist of 16 bits (= 2 bytes), and when converting this kanji code to a kanji pattern and displaying it, direct decoding requires a large amount of data. It requires memory and is particularly uneconomical when there are only a few types of kanji.

Therefore, conventionally, when displaying a pattern corresponding to kanji pattern data on a cathode ray tube (CRT), the kanji pattern was considered to be a type of special pattern as in the past, and a continuous internal code (a code that can be directly handled by hardware) was used. is received from the central processing unit in the form of a kanji, and a dot line (designating the line of the kanji pattern for the internal code) is added inside the display, inputted to the kanji pattern generator, and the corresponding line pattern of the corresponding kanji is read out. It was displayed.

However, with the above-mentioned kanji pattern display method, when the number of kanji types increases, the kanji pattern must be specified by page and code, which makes the processing of kanji codes complicated for the central processing unit, and even worse. This will reduce processing performance.

Also, when displaying a kanji pattern, if a kanji code is input, this kanji code will be used as the kanji pattern.
It is converted to a ROM address and dot line data is also added to become the address of the kanji pattern ROM, but if the kanji pattern is composed of a dot matrix such as 16 x 18,
The line data will be 5 bits, not ²ⁿ line data. For this reason, in the case of a 16 x 18 kanji pattern, the kanji pattern ROM has an unused area of 14 words for each kanji pattern character, and as a result, when the kanji pattern ROM capacity becomes around 1000 characters, the entire The unused area becomes large and becomes extremely uneconomical. In addition, if it is for 1000 characters, the capacity of the pattern ROM is 32KW.
becomes.

The present invention was made in order to solve the above-mentioned conventional drawbacks, and its purpose is to make it possible to use kanji codes as they are for reading kanji patterns, and to create an economical system that does not leave unused areas in the kanji pattern ROM. The purpose of the present invention is to provide a kanji pattern reading method that enables the use of kanji patterns.The main feature of this method is to receive a kanji code from an external device and read out a kanji pattern corresponding to the kanji code. , a storage device that stores the starting address of the pattern corresponding to the kanji code and the kanji pattern, a register that stores the input kanji code, a counter for kanji code conversion, and a comparison circuit that compares the input kanji code with the stored kanji code. and the counter control circuit, which receives the input kanji code as it is, and compares it with the kanji code read out by accessing the storage device while counting up on the counter, and creates a kanji pattern based on the counted number when there is a match. The counter controller reads out the storage start address of the kanji character pattern, presets it in the kanji code conversion counter by the counter control section, and reads out the kanji pattern while counting up again.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a display device to which the kanji pattern reading method according to the present invention is applied, in which 1 is a computer that processes various pattern information, 2 is a display control section, 3 is a refresh memory, and 4 is a pattern display device. A cathode tube (CRT) that displays information, 5 a character pattern generation circuit that converts character codes into corresponding character patterns (video signals), 6 a Bertol generator for drawing figures, and 7 Kanji characters in the present invention. pattern generation circuit,
Reference numeral 8 denotes an input device such as a keyboard or a light pen that conveys the intention of the operator to the computer 1 and forms a feedback route with the computer 1. The display control section 2 is connected to the computer 1, the refresh memory 3, and the cathode A device that organically connects the tube 4, character pattern generation circuit 5, belt generator 6, kanji pattern generation circuit 7, and input device 8, sends and receives data to and from the computer 1, and controls the entire display device. in,
Each of these components, except for the Kanji pattern generation circuit 7, are known.

FIG. 2 shows a specific example of the kanji pattern generation circuit 7, which includes a kanji code register 9 that temporarily stores the input kanji code obtained through the display control unit 2 through the processing of the computer 1, and a 1024 kanji code register 9.
Kanji code section 10a that stores kanji codes for characters
and a kanji address section 10 that stores the start address of the pattern corresponding to each kanji code.
ROM 10 for code conversion consisting of b and kanji pattern ROM 10 for storing kanji patterns for 1024 characters.
A clock supplied from the ROM 11 and the control section 12 which is organically coupled to the display control section 2.
An address counter 13 that is incremented by CLK and sequentially addresses the code conversion ROM, and a comparator 1 that compares the Kanji code read by this addressing with the contents of the Kanji code register 9.
4, and a flip-flop 15 that operates when the two kanji codes match in the comparator 14.
By adding the pattern start address of the matched kanji code to the kanji pattern ROM 11 via the address counter 13 by the load command signal LOAD from the control unit 12, the matched kanji pattern is designated as the address. At the same time, the kanji pattern read by this address designation is sent to the kanji pattern register 16 which holds one line of dot data for one character.

Next, the operation of the present invention configured as described above will be explained with reference to FIGS. 2 and 3.

For code conversion ROM10 and kanji pattern
The contents stored in the ROM 11 are as shown in Figure 3, and the stored kanji codes (for example,
AOAO = wealth, etc.), pattern start address data (for example, 0000, etc. corresponding to AOAO) is 16 bits 16
The kanji pattern is composed of 16 x 18 dot data, and the address corresponding to the kanji code, pattern start address data, and one line of dot data is composed of 4-bit hexadecimal. .

First, when a kanji code is given from the computer, this kanji code is set in the kanji code register 9 by the display control section 2, and a clock CLK is input from the control section 12 to the address counter 13. 13 is counted up by 1 from 0 to sequentially address the Kanji code section 10a of the code conversion ROM 10, and sends the data in the Kanji code section 10a to the comparator 14. This comparator 14 compares the kanji code from the kanji code section 10a with the kanji code in the kanji code register 9 (EQ=0
Therefore, the address ranges from 0 to 1023), and when the two match, the flip-flop 15 operates and stores it, and at the same time, the control section 12 outputs a LOAD signal and one clock. At this time, for code conversion
Since EQ=1 is input as the address of ROM10, the address of code conversion ROM10 is +
For example, if the matched kanji code is AOAO = wealth, 1024 will be added to the address 0000, which will be expressed in 4-bit hexadecimal as 0400, and the code conversion corresponding to this address will be The address section 10b of the ROM 10 stores the starting address 0000 of the kanji pattern corresponding to the matched kanji code. This start address 0000 is loaded into the address counter 13, and at the same time, the control section 12 sends the start address 0000 to the display control section 2.
A status indicating a match is notified. When a command to read a kanji pattern is received from the display control unit 2, one word (dot data for one line) is read from the ROM 11 for kanji patterns to the kanji pattern register 16, and at the same time, the control unit 2
At 2, one clock is output and the address counter is incremented by 1.

On the other hand, the pattern data read out to the kanji pattern register 16 is sent to the display control section 2 and refresh memory B, and is displayed on the cathode tube 4.

As described above, according to the kanji pattern display method of the present invention, the kanji code, the pattern start address corresponding to the kanji code, and the kanji pattern are stored in the ROM.
This is because the kanji pattern corresponding to the input kanji code is displayed by storing the memorized kanji code in memory, comparing and searching the memorized kanji code with the input kanji code, and determining the start address of the kanji pattern when there is a match. , the input Kanji code can be handled as is, the display processing of Kanji patterns becomes easy, and the Kanji pattern ROM can be used economically.
For example, when creating a kanji pattern ROM for 1000 characters, its capacity was 32KW, whereas
It can be reduced to 20KW. Although the present invention has been explained using an example in which it is applied to a display device,
It can also be applied to printers.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a display device to which the kanji pattern display method according to the present invention is applied;
FIG. 3 is a block diagram showing an example of a Kanji pattern generation circuit according to the present invention, and FIG. 3 is an explanatory diagram showing the data storage state of the code conversion ROM and the Kanji pattern ROM according to the present invention. In the figure, 1 is a computer, 2 is a display control unit, 3 is a refresh memory, 4 is a cathode tube, and 7
is a kanji pattern generation circuit, 9 is an input kanji code register, 10 is a ROM for code conversion, 11 is a ROM for kanji patterns, 12 is a control unit, 13 is an address counter, 14 is a comparator, 15 is a flip-flop, 16 is a kanji pattern register.

Claims (1)

[Claims] 1 In a kanji pattern reading method that receives a kanji code from an external device and reads out a kanji pattern corresponding to the kanji code, the kanji code, the start address of the pattern corresponding to the kanji code, and a storage device that stores the kanji pattern are input. It has a register for storing a kanji code, a counter for kanji code conversion, a comparator for comparing the input kanji code with the stored kanji code, and the counter control section, and receives the input kanji code as it is and converts it to the counter. While counting up, the storage device is accessed and compared with the read kanji code, and the storage start address of the kanji pattern is read out based on the count at the time of a match, and the kanji code is converted by the counter control unit. 1. A kanji pattern reading method characterized in that the kanji pattern is read out while presetting a counter and counting up again.