JPS62293288A - Character pattern transfer system - Google Patents

Abstract

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

Description

Detailed Description of the Invention Detailed Description of the Invention ['Industrial Field of Application] The present invention relates to a method for writing character patterns into a display memory for a bit map display, and in particular to a method for writing character patterns from a character pattern memory to a display memory at high speed. This relates to a character pattern transfer method for transferring data to a computer.

[Conventional technology]

Conventionally, in this type of character pattern transfer, a microprocessor repeatedly reads a character pattern consisting of multiple words from a character pattern memory one word at a time, calculates the address on the display memory, and then writes it to the display memory. was.

[Problem that the invention seeks to solve]

In the conventional character pattern transfer method described above, when transferring a single character pattern consisting of multiple words, each time one word is transferred, a character pattern readout process, a display memory address calculation process, and a display memory address loading process are performed. It has the disadvantage that the transfer process requires a long time because the write process is repeated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a character pattern transfer method that can perform high-speed transfer by directly writing character pattern information into a display memory with a simple configuration.

[Means for solving problems]

The structure of the character pattern transfer method of the present invention includes a display memory that stores display character data of a bit map display, a character pattern memory that stores character pattern data representing each character of the character data in a bit configuration, and a character pattern memory that stores character pattern data that represents each character of the character data in a bit configuration. a display memory address generation circuit that generates addresses for each of the character pattern data in a pattern memory; a display coordinate storage circuit that stores display position data of display character data stored in the display memory; and a display coordinate storage circuit that stores display position data of the display character data stored in the display memory; a microprocessor that controls the generation of the display memory address, the display position data of the character data stored in the display coordinate storage circuit and the character pattern address information provided by the microprocessor to the character pattern memory; The present invention is characterized in that a display memory address generation circuit generates the display address to be applied to the display memory, and writes the display address to the display memory at the same time as reading the character pattern data.

r Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the character pattern transfer method of the present invention.

In this figure, character pattern memory 1 stores character pattern information that expresses the shape of one character of display character data using m horizontal bits and 1% n bits. This is a memory that stores information in address order, and outputs information stored in one word corresponding to the address indicated by character pattern address 2 as character pattern information 3.

The display memory 4 is a memory that stores data for displaying i characters in the horizontal direction and j characters in the vertical direction, and has a structure in which addresses increase by 1 in the horizontal direction and by i in the vertical direction. , one character is expressed by n words consecutive vertically.

Further, character pattern information 3 is stored in a storage area indicated by display memory address 5.

The display coordinate storage circuit 6 is a circuit that stores coordinate information indicating the position of a character when writing a character in the display memory 4, and outputs coordinate information 7.

The display memory address generation circuit 8 is a circuit that generates a display memory address 5 from the coordinate information 7 and the character pattern address 2. The microprocessor 9 controls the transfer of character patterns from the character pattern memory 1 to the display memory 4.

The display 10 is a device that displays data for one pixel stored in the display memory 4 as one pixel on the display screen, and displays display data 11 read out from the display memory 4.

When transferring a character pattern, the microprocessor first sets coordinate information indicating the display position of the character in the display coordinate storage circuit 6 as an address corresponding to the first k.

Next, the address corresponding to f in Fig. 1 is output as character pattern address 2, and the bit pattern (01000010) 2 corresponding to line e in Fig. 1 is output as character pattern information 3 from character pattern memory 1. The display memory address 5 is generated by the display address generation circuit 8 based on e, which is the pattern address 2, and k, which is the display coordinate information 7.
As shown by The pattern is transferred from character pattern memory 1 to display memory 4.

〔Effect of the invention〕

As explained above, by having a display coordinate storage circuit and a display memory address generation circuit, the present invention can directly load character pattern information read from the character pattern memory into the display memory, and can transfer character patterns at high speed. There is an effective hair that can be used to change hair.

[Concise Description of Page 71 FIG. 1 is a block diagram showing an embodiment of the character pattern transfer method of the present invention.

1...Character pattern memory, 2...Character pattern address, 3...Character pattern information, 4...Display memory, 5
...Display memory address, 6...Display coordinate storage circuit,
7...Coordinate information, 8-...Display memory address generation circuit, 9...Microprocessor, 10...Bit map display, 11...Display data.

Claims (1)

[Claims] A display memory that stores display character data of a bitmap display, a character pattern memory that stores character pattern data representing each character of the character data in a bit configuration, and an address of each character pattern data of this character pattern memory. a display memory address generation circuit for generating a display memory address; a display coordinate storage circuit for storing display position data of display character data stored in the display memory; and a microprocessor for controlling transfer of the character pattern data and generation of the display memory address. and providing the display memory address generation circuit to the display memory from the display position data of the character data stored in the display coordinate storage circuit and the character pattern address information provided by the microprocessor to the character pattern memory. A character pattern transfer method characterized in that the display address is generated and written into the display memory at the same time as the character pattern data is read.