JPS6347795A - Character pattern access system - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Table of Contents] I Existing Industrial Fields of Application Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems (Fig. 1) Working Examples (a) One Implementation Explanation of examples (Figures 2 and 3) (b) Explanation of other embodiments Effects of the invention [(Already needed) Character pattern control information is extracted from character codes using a conversion table, and character patterns are generated using the character pattern control information. In the character pattern access method for accessing parts, a conversion table is provided that stores character pattern control information to be rewritten according to each character code table, and when the character code table is changed, the conversion table is rewritten with the contents of the exchange table. , which simplifies the conversion process to character pattern control information.

[Industrial application field]

The present invention relates to a character pattern access method for accessing a character pattern generating section used in printers, displays, etc., and in particular, when converting character codes to character pattern control information, the present invention relates to a character pattern access method for accessing character pattern generating units used in printers, displays, etc. The present invention relates to a character pattern access method that simplifies access processing in cases where character patterns are set.

To obtain a character pattern (including symbols and figures), convert the character code to character pattern control information, access the character pattern generation section that stores the character pattern using the character pattern control information, and obtain the character pattern. ing.

On the other hand, there are many types of character code tables that correspond to character codes and character patterns, for example, for each language, and there are cases where multiple character patterns are assigned to one character code, and the selection is up to the user. Possible by specification.

In such cases, there is a need to simplify the conversion process and reduce the table capacity.

[Conventional technology]

A conventional character pattern access method that supports a plurality of character code tables will be explained with reference to FIG.

The conversion table 1a corresponds to the character code table A that is most commonly used, stores character pattern control information corresponding to the character code, and converts the character code into the corresponding character pattern control information.

On the other hand, conversion tables 1b to 1n are other character code tables B-
It is provided corresponding to N, and when the character code indicates a character pattern different from the character code table A, the character pattern control information of that character pattern is stored.

Therefore, in each character code table A to N, if the character code and character pattern have the same correspondence, the character pattern control information is stored in the conversion table 1a, and if they are different, the character pattern control information is stored in the conversion tables 1a to 1n corresponding to the code table. This eliminates duplicate storage of the same item and reduces table capacity.

On the other hand, the standard conversion table 1a includes, as character pattern control information 10, the start address of the character pattern in the character pattern generation section, character pattern attribute information (width and height of the character pattern), and other pattern existence information. include. This separate pattern existence information indicates that if the character code vs. character pattern is common in each code table, there is no separate pattern, and if the character code vs. character pattern is different between the code tables, the separate pattern exists and its code table name. It is shown.

Further, the conversion tables 1b to 1n include character pattern start addresses and character pattern attribute information as character pattern control information 11.

Therefore, when character code table A is specified, conversion table 1a is accessed using the character code, character pattern control information 10 is taken out, other pattern existence information is ignored, and character pattern generation part is accessed using character pattern start address attribute information. By accessing , a character pattern according to character code table A can be obtained.

On the other hand, when another character code table B=N is specified, check the existence information of another pattern in the character pattern control information 10 obtained by accessing the conversion table 1a with the character code, and check the existence information of another pattern that is common to character code table A. If so, the character pattern generation section is accessed using the character pattern start address and attribute information of the character pattern control information in the same way as described above. On the other hand, if it is determined that the character code table is different from the character code table A based on the other pattern existence information, the conversion table 1b corresponding to the character code table
~1n is accessed using the character code, character pattern control information 11 is taken out, and the character pattern generation section is accessed.

[Problem that the invention seeks to solve]

In such a conventional access method, if character code table B "N" is specified below the standard character code table A, it is necessary to refer to the separate pattern existence information for each character. If it exists, the conversion tables lb to 1n must be accessed again, and the access process becomes ?j19i, resulting in a problem that the processing speed for extracting the character pattern control information becomes slow.

The present invention prevents the process of extracting character pattern control information from becoming complicated even if the specification of a character code table is changed;
The object of the present invention is to provide a character pattern access method that can improve processing speed.

(Means for solving problems) FIG. 1 is a diagram explaining the principle of the present invention.

In the figure, 1 is a conversion table that stores character pattern control information (character pattern start address and attribute information) corresponding to character codes, and 2 is an exchange table that stores character pattern control information (character pattern start address and attribute information) corresponding to character codes. Stores character pattern control information corresponding to character codes that should be rewritten accordingly (things,
Reference numeral 3 denotes a character pattern generation section, which is accessed by character pattern control information and generates a corresponding character pattern.

In the present invention, when a character code table is specified, character pattern control information corresponding to the character code to be rewritten according to the specified character code table is read from the exchange table 2,
I am trying to rewrite conversion table 1.

[Effect]

In the present invention, when the character patterns for the character codes differ in each code table, the character pattern control and information are stored in the exchange table 2, and when the specified character code table is changed, the exchange table 2 The character pattern control information to be rewritten is read out in accordance with the character code table concerned, and the conversion table 1 is rewritten.

This rewriting is not necessary for cases in which the character pattern to character pattern is common, but is performed for cases in which the character code to character pattern is different in each character code table.

Therefore, each time a character code table is changed, a conversion table 1 corresponding to that character code table is configured with a minimum of writing, and just by accessing conversion table 1 with the character code, the character code table can be changed. The corresponding character pattern control information can be obtained, thereby simplifying the access process and improving the processing speed.

〔Example〕

(a) Description of one embodiment FIG. 2 is a block diagram of one embodiment of the present invention, and FIG. 3 is a detailed diagram of FIG. 2.

In the figure, the same items as those shown in Figure 1 are indicated by the same symbols, and 2a is an exchange information index, which is exchange information corresponding to the character code to be rewritten for each character code table A to N. 2b is an exchange information table that stores the exchange/information storage address of the table (described later); 4 is a global memory (hereinafter referred to as GLM), which is provided with a conversion table 1, an exchange table 2 (exchange information index 2a and exchange information table 2b), and a character pattern generation section 3, and 5 is an interface section (hereinafter referred to as INF). , which exchanges data and commands with the host computer and receives specified character code tables and character codes from the host computer, 6
7 is a processor (hereinafter referred to as MPU), which is composed of a microprocessor, has a local memory 6a, and performs access processing by executing a program, and 7 is a bitmap memory (hereinafter referred to as BMM), which stores characters. 8 is a direct memory access circuit (hereinafter referred to as DMAC), which sequentially reads the contents of 8MM7 by direct memory access and provides it to the printer (described later). 9 is the printer. unit (hereinafter referred to as PRU), which is composed of, for example, a laser printer, and which prints BMM7 from DMAC8.
10 is a bus, lNF3,
Connect MPU6, GLM4.8MM7, DMAC8,
Data and commands are exchanged between these devices.

A character code table is provided for each language such as English, French, German, etc., and includes characters such as "#" (pound sign), ".

” (comma symbol), alphabento characters, etc. in each character code table, the character code vs. character pattern is common.

On the other hand, the currency units are “$j (dollar sign),” “FRJ
(franc symbol) etc., and the character code versus character pattern is different for each language, that is, the character code table.

Therefore, in order to obtain a desired language pattern, the host computer issues a character code table change command (including character code table designation) prior to the character code. This change command is received by the INFS and given to the MPU 6 via the bus 10.

MPtJ6 refers to GLM4's exchange information index 2a,
The character code to be rewritten corresponding to the specified character code table is searched for, and the storage address (exchange information storage address) on the exchange information table 2b storing the character pattern control information corresponding to the character code is retrieved.

Next, the MPU 6 reads the character pattern control information of the exchange information table 2b from the retrieved storage address, and further reads out the character pattern control information already written for the character code to be rewritten on the conversion table 1. Rewrite to control information.

When the MPU 6 executes this for the character code to be rewritten in the character code table on the exchange information index 2a, the conversion table 1 becomes the one for the specified character code table.

From now on, the character code from the host computer will be lNF.
3 to the MPU 6, the MPU 6 refers to the conversion table 1 of the GLM 4, extracts the corresponding character pattern control information, uses this to access the character pattern generation section 3 of the GLM 4, and extracts the corresponding character pattern. ,
Expand to 8MM7.

In this way, for example, if the character pattern of one page's character code is developed into 8MM7, DMA C8 becomes 8MM7.
Direct memory access control is performed, and the contents of 8MM7 are sequentially sent to the PH10, thereby printing 2 pages.

(b) Description of other embodiments In the embodiment described above, the exchange table 2 is provided in the GLM 4, but it may also be provided in the local memory 6a of the MPU 6, or only the exchange information index 2a may be provided in the local memory 6a of the MPU 6. It may be stored in the memory 6a.

Further, although the printer unit 9 is used as the output unit, a display unit may also be used.

Although the present invention has been described above using examples, the present invention can be modified in various ways according to the gist of the present invention, and these are not excluded from the present invention.

〔Effect of the invention〕

In addition to the above explanation, according to the present invention, there is no need to check whether a character code exists on the conversion table or refer to another table every time a character code is received after a command to change the character code table is issued.
This simplifies the process of extracting character pattern control information and improves processing speed.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2 is a configuration diagram of an embodiment of the present invention. FIG. 3 is a detailed diagram of one embodiment of the present invention; FIG. 4 is an explanatory diagram of the prior art. In the figure, 1.--conversion table, 2-・・・exchange table, 3--Character pattern generation section.

Claims (1)

[Claims] A conversion table (1) for extracting character pattern control information from a character code is provided, and a character pattern generation unit (3) is accessed by the character pattern control information from the conversion table (1), In the character pattern access method that obtains the character pattern corresponding to the character code, a conversion table (2
), read character pattern control information corresponding to the character code to be rewritten according to the specified character code table from the conversion table (2), and write the corresponding character pattern control information of the conversion table (1). A character pattern access method characterized by changing characters.