JPH02226332A - Data processor - Google Patents

Abstract

PURPOSE:To store and read out character patterns in and from a non-volatile memory by providing a memory BUM backed up with a battery, a character pattern address converting part which reads out character patterns from the memory BUM, and a pattern setting part which stores character patterns in the memory BUM besides a ROM where character patterns are stored. CONSTITUTION:A read-only memory (ROM) 1 where character patterns are fixedly stored, a character pattern memory (BUM) 2 which is backed up with the battery and where new character patterns are stored, a pattern setting part 4 which designates character patterns to be stored in the character pattern memory 2, and a character pattern address converting part 3 which converts a specific address of the ROM 1 to a specific address of the BUUM 2 are provided. When standardly used character patterns are changed or added, these character patterns are stored in the BUM 2 from the pattern setting part 4 and are easily read out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data processing device, and more particularly to a data processing device that processes characters.

[Conventional technology]

Conventional data processing devices that process characters use mask ROM as a nonvolatile memory to store character patterns.
It uses only fixed memory elements such as.

[Problem to be solved by the invention]

However, if a non-volatile memory for storing character patterns is constructed using only the above-mentioned storage elements, character patterns may Although it is necessary to update the contents of the memory, this cannot be done easily, so there is a drawback of lack of flexibility.

[Means to solve the problem]

The data processing device of the present invention includes a read-only memory that permanently stores character patterns, a character pattern memory that is backed up by a battery and stores new character patterns, and a character pattern to be stored in the character pattern memory. and a character pattern address converter that converts an access to a specific address in the read-only memory to a specific address in the character pattern memory and reads the same.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

The embodiment shown in FIG. 1 includes a read-only memory (ROM) 1 that permanently stores character patterns, a character pattern memory (BUM) 2 that is backed up by a battery and stores new character patterns, and a character pattern memory 2 that stores new character patterns. a pattern setting section 14 that specifies a character pattern to be stored in the
and BUM access to a specific address in ROM 1.
The character pattern address conversion unit 3 converts the address into a specific address.

The character pattern address conversion section 3 is connected to the ROM 1 and BUM 2 by access buses 11 and 12, respectively, and is also connected to the data processing section 5 by an access bus 13 and is controlled by the data processing section 5.

The long BUM2 is connected to the pattern setting section 4 by a maintenance bus 14.

In addition to the ROM 1 that permanently stores character patterns, the data processing device configured in this manner has a BUM 2 backed up by a battery and a character pattern address converter 3, which stores character patterns that are normally used. When a change or addition is made, the character pattern is stored in the BUM2 from the pattern setting section 4, and can be easily read out.

〔Effect of the invention〕

As explained above, the data processing device of the present invention includes, in addition to the ROM that permanently stores character patterns, a BUM backed up by a battery, a character pattern address converter that reads character patterns from this, and a character pattern stored in the BUM. By being equipped with a pattern setting section that stores patterns, even when standard character patterns are changed or new character patterns are added, those character patterns can be easily stored in non-volatile memory. This has the effect of making it possible to read and use it.

Brief description of the drawing FIG. 1 is a block diagram showing one embodiment of the present invention.

1...ROM 2...BUM, 3...Character pattern address conversion section, 4...Pattern setting section, 5...
・Data processing section.

Claims (1)

[Claims] A read-only memory that permanently stores character patterns,
a character pattern memory that is backed up by a battery and stores new character patterns; a pattern setting unit that specifies a character pattern to be stored in the character pattern memory; and a character pattern memory that controls access to a specific address of the read-only memory. A data processing device comprising: a character pattern address conversion section that converts the character pattern address into a specific address and reads the character pattern address.