JPS5939048B2 - Code conversion method - Google Patents

Description

Detailed Description of the Invention The present invention uses a code table divided into a plurality of sub-tables, selects a sub-table based on an input code, and selects the first code in the sub-table that corresponds to the registration code specified by the input code. This relates to a code conversion method that performs calculations and converts into registered codes according to the order of the registration table.

Conventionally, when you want to convert an input code from a certain input device into another code and output it to a predetermined device, for example, as shown in FIG. A method is often used in which the coordinate code is converted into a character code and then displayed on the display 4 via the character generator 3.

In this case, code table 2 is stored in the same way as normal memory.
The coordinate code of the key switch is used as an address, and the character code is stored as data. Since this code table is attached around the display device, it is desirable that the processing is simple and that it is compressed into a small size.

Normally, such code conversion involves converting the coordinate code from the keyboard etc. into a consecutive character code and supplying it to the character generator as an interface code. Converted into internal code for generating character patterns.

The interface code converted from the coordinate code may be a continuous rank code, but as for the internal code, only codes registered in the character generator are selectively converted, and unregistered codes are excluded and transferred to other processing means. If an attempt is made to implement the selective conversion procedure to the internal code in this case using a normal comparison circuit, the configuration will inevitably become quite complicated.

An object of the present invention is to provide a code conversion method that selectively converts only registered codes among input codes using a code table that is easy to process.

In order to achieve the above object, the code conversion method of the present invention is a code conversion method that converts an input code into a designated registered code using a code table and outputs the code, wherein the code table is composed of a plurality of sub-tables, and each The sub-tables each include a plurality of sets consisting of a leading code and one of the ordered registration tables, and the input code is decoded to select a sub-table within the code table, and the registration table within the sub-table is decoded. If the code corresponds to the registration code designated as the input code, the first code in the sub-table is calculated according to the order of the registration table and converted into the registration code.

The present invention will be described in detail below with reference to examples.

FIG. 2 is an explanatory diagram showing the configuration of an embodiment of the present invention.

The keyboard 1 shown in FIG. 1 is operated to convert each coordinate code into a character code using the code table 2. It is assumed that this character code is, for example, a 2-byte interface code consisting of a hexadecimal rank code.

This interface code is stored in the register 11 divided into an upper byte and a lower byte. And rank part-time job 8
Send bit signal 1 to code table 12 to select one of 256 sub-tables. FIGS. 3A and 3B are detailed explanatory diagrams of the above-mentioned sub-table 20.

In the same figure a, the sub-table 20 has 16 sets 210 to 2115 in which the 2-byte leading code 22 and the 2-byte registration table 23 for registered characters of the character generator are arranged in order.
These 16 sets of areas are selected by the 4-bit signal 2 of the lower byte of the register 11.

Then, the leading code 22 of the selected sub-table 20 and the contents of the registration table 23 are output. Registration table 23
As shown in FIG. 2B, the character registration code of the character generator is stored in each of the characters. For example, when the bit order m (m=0 to 15) is 1, there is a registration code, and when it is 80, there is no registration code. Therefore, the bit order m of the Inter J■■ registration table stored in the register 11 is specified, and this numerical value count 1 is used together with the contents of the registration table shown in FIG. (1) Send to 13. Here, if the bit corresponding to m of count 1 is "1", it means that there is a registration code specified in the interface code, so the registration table 23 is shifted to the left by the value of count 1, and Count how many bits are ``1'' before the bit corresponding to .

The count value 2 is sent to the arithmetic circuit ([[) 14 together with the first code outputted from the code table 12 described above, where they are added as shown in the following equation and output as an internal code of the character. Internal code - start code + count value 2 If the bit corresponding to m of count 1 in the registration table in the arithmetic circuit (1) 13 is ゛O'゛, there is no registration code specified in the interface code. Therefore, the arithmetic circuit (1) 13 outputs a signal without a registration code, and is controlled to proceed to processing by, for example, another character generator.

As explained above, according to the present invention, a code table divided into a plurality of sub-tables is used, a sub-table is selected by manual code, and the first code in the sub-table corresponds to the registered code specified by the input code. The code is calculated according to the order of the registration table and converted into another code, for example, an internal code.

Thereby, for example, a code table with a relatively small storage capacity can be used as a means for inputting a ranking interface code, selecting only the specified registration code, and converting it into an internal code. Furthermore, this code table has a code conversion function as well as a selection function to select whether there is a code to be converted or not, and both functions can be combined with the same storage capacity and requirements as the conversion function alone. It can be processed efficiently in time.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a conventional example, FIG. 2 is an explanatory diagram of the configuration of an embodiment of the present invention, and FIGS. 3A and 3B are explanatory diagrams of main parts of the embodiment of FIG. Inside, 11 is a register, 12 is a code table, 13 and 14 are arithmetic circuits, 20 is a sub table, 210 to 2115 are sets, 22 is a leading internal code,
23 indicates a registration table.

Claims (1)

[Claims] 1 In a code conversion method that converts an input code into a specified registered code using a code table and outputs it,
The code table is comprised of a plurality of sub-tables, each sub-table including a plurality of sets each consisting of a first code and one of the registered tables arranged in order, and the input code is decoded and the sub-tables in the code table are decoded. If the registration table in the sub-table corresponds to the registration code specified in the input code, the first code in the sub-table is calculated according to the order of the registration table and becomes the registration code. A code conversion method characterized by conversion.