JPS5821272B2 - Moji pattern hatsei sochi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a character pattern generation device that is capable of generating character patterns for vertical writing and horizontal writing from a character pattern storage unit stored for vertical writing (or horizontal writing).

Generally, the character patterns that can be generated in a character pattern generator are defined as either vertical writing or horizontal writing, but this is an important element that constitutes the character pattern generator. This is due to the fact that certain character pattern storage units can only be read and written in one direction.

For this reason, conventionally, for example, two character pattern generating devices are required in order to enable display (or recording) of both vertical and horizontal writing on a character display (or recording) device.

To eliminate this drawback, it is necessary to replace all of the large character pattern storage with a storage device that can be read in two directions (row and column directions in matrix representation).

However, if you write all the character pattern storage parts as new,
Switching to a read-out type storage device will be expensive.

The present invention has been developed in view of the above-mentioned circumstances, and is a character pattern generator having a large capacity character pattern storage section, by adding a new small capacity storage section with different reading and writing directions. Another object of the present invention is to make it possible to generate two types of character patterns for vertical writing and for horizontal writing from character patterns stored for horizontal writing, thereby effectively utilizing a character pattern storage section.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 1 shows an embodiment of the present invention.

In the figure, 1 is a character code register in which instruction information for a desired character (hereinafter referred to as a character code) is set, and 2 is information that indicates which column (row) of the matrix-represented character code is in the pattern. A line number instruction register 3 in which is set controls the reading of a desired row (or column) character pattern based on the contents of each of the registers 1 and 2 and a direction instruction signal LCD 5 that instructs whether to read rows or columns. The first readout control section 4 is a character pattern storage section that can be read out at high speed in the row (or column) direction.

5 is a write control unit that controls writing the character pattern received from the first read control unit 3 in the column (or row) direction into the block 6; 6 is a high-speed column (or row) direction write; high-speed row (or column) direction; The direction conversion storage section I, which is readable and has a storage capacity of only one character pattern, reads out the pattern in the row (or column) direction from the direction conversion storage section 6 according to the direction instruction signal LCD 5 and the contents of the line number instruction register 2. This is a second readout control section that performs control for this purpose.

8 indicates a readout pattern from the first readout control section 3 in accordance with the direction instruction signal LCD5, for example, in the case of a column (or row) direction readout instruction, and the second readout control section in the case of a row (or column) direction instruction. This is a switching circuit that selects the readout pattern from I as a desired pattern.

Reference numeral 9 denotes a readout register for setting the readout pattern passed through the switching circuit 8, and 10 denotes a strobe signal STo output from the first readout control section 3 and the second readout control section 7.
, ST1 and outputs an ST times signal.

Note that DS and R8 are read instruction information, WS is write instruction information, RD is read data, WD is write data, and WE is a write end signal.

For convenience, the storage direction of the character pattern expressed in the matrix is ai(i-θ~5) as shown in Figure 2A.
) are the rows, bj (j-0 to 5) are the columns, the vertical writing pattern is in the direction shown in Figure 2, and the horizontal writing pattern is in the direction shown in Figure 2, C.

The reading direction of the character pattern storage section 4 is row direction reading as shown in FIG. 3A, and the writing direction and readout direction of the direction conversion storage section 6 are column direction writing as shown in FIG. Read in row direction.

That is, the direction conversion storage unit 6 is assumed to be a storage device in which the writing direction and the reading direction are different from each other in terms of columns and rows.

The operation of FIG. 1 is as follows.

Suppose now that a character code of "4" is externally set in the character code register 1, "0" is set in the line number instruction register 2, and a column direction read instruction is set as the direction instruction signal LCD5.

The first read control unit 3 calculates the storage address of the character pattern “4” from the contents of the character code register 1 and the line number instruction register 2 and the column direction read instruction signal LCD 5, and instructs the character pattern storage unit 4 to read it. Information D
Give S.

In this case, the character pattern storage section 4 is a in FIG.

The pattern corresponding to the row is read out and passed to the write control section 5 through the first read control section 3.

The write control section 5 writes this read pattern into the direction conversion storage section 6 in the 0th column in the direction shown at the beginning of FIG.

Next, by setting line number instruction register 2 to “1”,
The readout control unit 3 reads 3 of the character pattern “4” in Figure 1.
A pattern corresponding to one row is read from the storage section 4, and when a write end signal WE is received from the write control section 5, the read pattern is passed to the write control section 5.

The write control section 5 writes this in the direction conversion storage section 6 in the first column shown at the beginning of FIG.

Below, a2. By repeating the above-described operations for the patterns in rows a3, a4, and 35, the replacement of the pattern from mouth to c shown in FIG. 2 in the direction conversion storage section 6 is completed.

When this replacement is completed, line number instruction register 2
Return the contents of to "θ" again.

Thereafter, the second readout control section 7 reads out the 0th row pattern in the row direction shown in FIG. 3C from the direction conversion storage section 6 based on "0" in the line number instruction register.

The read pattern is set in the read register 9 through the switching circuit 8 which selects the pattern from the read control section 7 in accordance with the column read instruction of the direction instruction signal LCD5.

At the same time, a strobe signal S is sent from the second readout control unit 7 to notify the external device of the end of reading out the desired pattern.
T1 is sent out through the OR gate circuit 10.

Below, the contents of line number instruction register 2 are as follows: 1.2.3.4
．． 5 and repeating the same operation, a character pattern (referred to as "horizontal writing" in the column direction read column) is generated.

In addition, in order to perform the above-mentioned operation, between the cycle time Ta that requires a character pattern, the read cycle time Tb of the character pattern storage section 4, the write cycle time Tc of the direction conversion storage section 6, and the read cycle time Td. It is necessary that the following relationships are maintained.

That is, Ta>n (6Tb+6Tc+Td), where n is the number of multiplexes when this character pattern generator is used multiplexed, and n=o, .

Next, the operation of reading in the row direction (generating patterns for vertical writing) will be described.

In this case, it is similar to the conventional character pattern generation device, and the first readout control section 3, character pattern storage section 4, and
The readout pattern from the first readout control unit 3 is directly read out from the register 9 by the row direction instruction signal LCD5.
A character pattern is generated using a switching circuit 9 or the like which is switched so as to take in the character pattern.

That is, in the case of the above-mentioned column direction reading, the row pattern read once from the character pattern storage section 4 is written into the direction conversion storage section 6, but in the case of the row direction reading, the row pattern read out from the character pattern storage section 4 is directly set in the readout register 9 through the switching circuit 8, and the first readout control unit 3 also sends out the strobe signal STo through the OR gate circuit 10 to notify the external device of the end of reading out the desired pattern.

Therefore, the read cycle time for row direction read and column direction read is different, and the ratio is T
b: 6Tb+6Tc+Td.

Although the embodiment of the present invention has been explained using a character pattern expressed as a 6×6 square matrix, mXn(m,
It goes without saying that even in the case of a matrix (n is a positive integer), it is possible to generate character patterns in both vertical and horizontal directions using a similar structure.

As explained above, according to the present invention, matrix expression can be achieved by simply adding a small-capacity direction conversion storage section and a simple control section to a character pattern generation device that only has a character pattern storage section that stores characters in one direction. Character pattern row, column 2
Since directional reading becomes possible, the character pattern storage units for vertical writing and horizontal writing can be shared, and the character pattern generating device can be made more economical.

[Brief explanation of drawings]

FIG. 1 is an embodiment of the device of the present invention, FIG. 2 is a diagram showing the relationship between the storage direction of character patterns and the direction of character patterns for vertical writing and horizontal writing, and FIG. 3 is a diagram showing the characters in FIG. 1. FIG. 6 is a diagram illustrating a reading direction of a pattern storage section and a writing and reading direction of a direction conversion storage section. DESCRIPTION OF SYMBOLS 1...Character code register, 2...Line number instruction register, 3...First reading control section, 4...Character pattern storage section, 5.・・・・・・
・Writing control section, 6.°...° direction conversion storage section,
7...Second readout control unit, 8...Switching circuit, 9...Readout register.

Claims (1)

[Claims] 1. A character pattern storage unit that stores character patterns expressed in a matrix and can only be read in one direction;
It is equipped with a direction conversion storage section having different writing and reading directions, and a control section that controls writing and reading of each of the storage sections, and reads out the character pattern from the character pattern storage section according to a readout direction instruction given from an external device. Either the direction pattern is sequentially read out for each row (or column) and given to an external device, or the pattern of each row (or column) read from the character pattern storage section is sent to the direction conversion storage section. (or row) direction to each column (or row), and read out the pattern written in the direction conversion storage unit sequentially from the row (or column) direction to each row (or column) and provide it to an external device. A character pattern generator characterized by being configured as follows.