JPS5936314B2 - Display device control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control method for a display device using Kanji codes, such as a Kanji printer.

For example, when a kanji printer receives a kanji code from an input device and prints the dot pattern, a complicated control circuit is required to print the dot pattern in a format specified by the paper size or the control code in the kanji code.

For this reason, recently, a system has been adopted that simplifies the circuit by incorporating a microcomputer and processing the control with a microprogram. Incorporating a microcomputer makes it possible to simplify the hardware by replacing hardware logic with program logic, but on the other hand, microprograms have a slow processing speed and take a lot of time. There are drawbacks. Therefore, in reality, the above method cannot be used in high-speed printers. This invention has been made in view of the above points, and provides a control method for a display device that can simplify the circuit and increase the processing speed by processing the control using a microprogram using a microcomputer. The purpose is to

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

In FIG. 1, numeral 11 is an input device for generating Kanji codes, 12 is a microcomputer control section, and this microcomputer control section 12 is composed of a code analysis section 13 and a code buffer 14. 15 is a pattern generator that has a built-in pattern memory and converts character codes from the code buffer 14 into character patterns; 16 is a decoder that decodes control codes and generates control signals;
T is a printer control unit, and 18 is a printer. The Kanji code output from the input device includes a character code and a control code, each of which is composed of 16 bits. That is, the Kanji code is sent twice in units of 1 byte (8 bits), and usually the first 1 byte is called the X code and the next 1 byte is called the Y code. The above X code,
In the case of both the Y code and the character code, it is normal that only a maximum of 7 bits are used. Therefore, the most significant bit of the character code is an empty bit. Figure 2 shows this relationship. In Figure 2, Xl, X2,...
......, X7 indicates the character bit of the X code, A indicates the empty bit of the X code, and Y,, y2,...
......, Y7 indicates a character bit of the Y code, and B indicates an empty bit of the Y code. One character is composed of a total of 14 bits, including 7 bits of the X code and 7 bits of the Y code. However, the input device 11
When the kanji code output from the kanji code is sent to the code analysis section 13, it is analyzed whether the kanji code is a character code or a control code.

If the result of code analysis is a character code, it is stored in the code buffer, and if the result of code analysis is a control code, it is converted into a simple control code consisting of 2 bits, and this control code is is added to the empty bit of the character code stored in the code buffer 14 immediately before the control code is output from the human-powered device 11. For example, the bit configuration of the control code after conversion is “
01" is preset as a line break, "10" is a page break, etc., and if a control code of 801" is entered, the empty bit Al<00" on the X code side of the character code stored in the code buffer 14 is set in advance. .6" to the empty bit B on the Y code side.
” is added. This controls so that a line feed is inserted after the character indicated by the character code to which that control code is attached is printed. In other words, as shown above, the blank bit A on the X code side is Of the character codes in which a control code is added to the empty bits such as 11 to the empty bit B on the 0-Y code side, the character code part is processed by the pattern generator 1.
5, the character code is converted into a character pattern defined by the character code, and then inputted to the printer control section 17, and under the control of the printer control section 17, the printer 18 is driven to print a predetermined character. Note that the microcomputer control unit is not involved in the access between the code buffer 14 and the pattern memory in the pattern generator 15. The control code portion is then input to the decoder 16 and is
The code of ゛ is decoded. Then, a control signal meaning "01" is generated to the printer control unit 17, which controls the printer 18. However, since the above control code 101" here means a line feed, the above character is printed. Afterwards, a new line is added.In this way, the kanji codes that are output one after another from the input device 11 are analyzed to determine whether they are character codes or control codes, and the character codes are stored in the code buffer and then converted into character patterns. If there is a control code between these character codes, that control code is added to the empty bit of the previous character code stored in the code buffer, and the instruction signals such as line feed and page feed are generated from this control code. is given to the printer control section, and the printer is controlled according to this instruction signal.

In the above embodiment, a kanji printer has been described, but the present invention is not limited to a kanji printer, but can also be used for other display devices such as a kanji display device. Further, in the above embodiment, there is one code buffer, but a plurality of code buffers may be used.
By using a plurality of code buffers, it becomes possible to input kanji codes continuously without running out of time. Furthermore, if a row buffer is used to further latch control bits, the control commands can be further expanded.
As explained above, according to the present invention, control bits indicating line feed, page break, etc. are added to the empty bits of the kanji code, and the printing section is controlled by this, so that the microcomputer can control the input kanji code. It is sufficient to perform functions such as determining whether a character code is a character code or a control code, storing the character code, and adding control bits to the empty bits of the stored character code, and is not involved in output control. It's good.

Then the output is transferred to DMA (DirectMemOryAce)
ess) transfer speeds up the processing, and since the control bits are added to the empty bits of the kanji code, for example, character codes, line feed codes, character codes, etc.
Various excellent effects can be obtained, such as the fact that there is no need to increase the capacity of the code buffer even in the case of continuous line feed codes.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
FIG. 2 is a diagram showing the bit structure of the Kanji code according to the same embodiment. 11...Input device, 12...Microcomputer, 13...Code analysis section, 14.
...Code buffer, 15...Pattern generator, 16...Decoder, 17...
... Glinter control unit, 18...

Claims (1)

[Claims] 1 In a device that sequentially inputs a character code and a control code from an input device and displays a character pattern corresponding to the character code under the control of conditions specified by the control code, the code from the input device is analyzed. If the result of code analysis is a character code, this character code is stored, and if it is a control code, it is converted to a simple control code and the code is additionally stored in the empty bit of the immediately preceding character code. A microcomputer control unit having a buffer, a pattern generator that directly accesses the code buffer of the microcomputer control unit and generates a character pattern corresponding to the character code, and decoding the converted simple control code added to the character code. 1. A control method for a display device, comprising: a decoder, the display device being controlled according to the output from the decoder, and displaying a character pattern from a pattern generator.