JPS6360759A - Method for character rotation processing in printer - Google Patents

Abstract

PURPOSE:To reduce rotation processing time and to enable high-speed printing, by a method wherein data is rotated leftwards 90 deg. or leftwards 270 deg. by being fetched from the direction at right angles to shift registers by one byte in a predetermined order and data is rotated leftwards 180 deg. by being fetched from the travel direction of the shift registers by one byte in a fixed order. CONSTITUTION:Data of 72 bytes is read while shift registers 15 are changed over by 8 pieces to develop the data for one character on the 24 shift registers 15. After that, with a 90 deg. leftward rotation signal RO1 a rotation angle is specified 90 deg., and a command for writing one byte in a RAM 20 is conducted, whereby the data '1' is fetched from the direction right angles to the shift registers 15 to write one byte in the RAM 20 through an output buffer 11as an output data 18. In this manner, with a command for writing 72 bytes in the RAM, the output data 18 which was rotated leftwards 90 deg. is written in the RAM 20. Conventionally, 8-byte reading from the RAM has been required to rotate data for one byte, but one-byte reading is sufficient according to the invention; thus, a rotation processing time is reduced and a high-speed printing can be carried out.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a character rotation processing method for a printing device.

〔overview〕

The present invention provides a rotation processing method for a printing device in which data stored in a memory is read out and rotated by a predetermined angle, the data being developed in a shift register in all bits,
By taking out one byte at a time in a predetermined order from the right angle direction of this shift register, 90' left rotation or 270'
``Rotate to the left and take out bytes one byte at a time in a predetermined order from the advancing direction of the shift register.
By rotating, the rotation processing time is shortened and high-speed printing becomes possible.

[Conventional technology]

Conventionally, the character rotation processing method of printing devices reads 1 byte of data from RAM (random access memory) and performs bit arithmetic processing eight times, then rotates the 1 byte of data, and then This was done by writing that 1 byte of data into RAM and repeating it for 1 character (n bytes) n times.

[Problem that the invention seeks to solve]

The character rotation processing method of the conventional printing device described above is (a)
This is because bit arithmetic processing is required, (a) 8 bytes of data must be read from RAM to rotate 1 byte of data, and (i) the calculation method is complicated. For high-density characters, the rotation process takes too much time, making it unsuitable for high-speed printing.

SUMMARY OF THE INVENTION An object of the present invention is to provide a character rotation processing method for a printing device that can shorten the rotation processing time and perform high-speed printing by eliminating the above-mentioned drawbacks.

[Means for solving problems]

The present invention relates to a character rotation processing method for a printing device that reads data stored in a memory and performs rotation processing by a predetermined angle. While shifting the above data, expand [8 x N2] bytes of data one byte at a time, and take out the expanded [3 x N2] bytes of data one byte at a time from the right angle direction of the shift register in a predetermined order. It is characterized in that it is rotated 90'' to the left or rotated 270' to the left, and rotated to the left by 180' by taking out one byte at a time in a predetermined order from the advancing direction of the register.

[Effect]

In the present invention, data read from a memory is expanded one byte at a time into, for example, 24 24-bit shift registers, and the expanded 72-byte data is placed in a predetermined order from the direction perpendicular to the shift registers. The comb is rotated 90 degrees to the left by taking it out, and the comb is rotated 270 degrees to the left by taking it out in a predetermined order from the traveling direction of the cyst register.

Therefore, it is only necessary to develop the data to be rotated on the register and take out the data in a predetermined manner, thereby making it possible to shorten the rotation processing time.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the main parts of a printing device according to an embodiment of the present invention. In this embodiment, a character rotation processing circuit 10, a RAM (random access memory) 20 that stores print data, and a bidirectional system that controls data exchange between a data bus 40, RAM 20, and the character rotation processing circuit 10 are used. buffer 30.

The character rotation processing circuit 10 includes an 8-bit unidirectional output buffer 1 for outputting output data 18 and an 8-bit unidirectional input buffer 1 for inputting input data 17.
2, an output counter 13, an input counter 14, 24 24-bit shift registers 15, and a 24-bit buffer 16 whose input is connected to the output of each shift register 15. 8 from the top
They are divided into groups 15a, 15b and 15c, and one byte of input data 17a, 17b and 17C is input from the input buffer 12, respectively.

In FIG. 1, WR is a RAM write signal, ■ is a RAM read signal, CE is a chip enable signal, and RO
, is a 90° left rotation instruction signal, RO2 is a 270° left rotation instruction signal, and RO's is a 180° left rotation instruction signal.

Next, the operation of this embodiment will be explained with reference to FIGS. 2 to 4. When one byte of data is read from the RAM 20 as input data 17, one byte is sent to eight shift registers 15 of group 15a as input data 17a via input buffer 12. Next, when one byte of data is read out, the input counter 14 is incremented and one height is shifted to the eight shift registers 15 of group 15b as input data 17b. Similarly, the next 1 byte of input data 17c is group 1.
One byte is sent to eight shift registers 15 of 5c. In this way, groups 15a, 15b and 1
While switching the eight shift registers 15 of 5c,
When 72 bytes of data are read, one character's worth of data can be developed on 24 shift registers 15.

Next, when the rotation angle is designated as 90° by the 90° counterclockwise rotation signal RO, and an instruction to write to the 1-byte RAM 20 is executed, the data shown in FIG. The data is written into the 1-byte RAM 20 as output data 18 via the output buffer 1). Subsequently, when an instruction to write into the 1-byte RAM 20 is executed, the output counter 13 is incremented and the data marked with ■ shown in FIG. 2 is written into the RAM 20. In this way, when the instruction to write to the 72-byte RAM is executed, data is taken in in the order (■, ■, ..., ■, ■) shown in FIG. 2, and the output data 18 is rotated 90 degrees to the left. is RAM20
written to.

Similarly, in the case of 270" counterclockwise rotation, the rotation angle is designated as 270° by the 270" counterclockwise rotation instruction signal RO8 and written, so that the order shown in FIG. 3 (■, ■, .
-1■,■), the data is sequentially transferred to the shift register 15.
The output data 18 is taken out from the right angle direction and rotated counterclockwise by 270'' and is written into the RAM 20.

On the other hand, in the case of 180° counterclockwise rotation, the rotation angle is designated as 1806 by the 180° counterclockwise rotation signal RCh and written in the order shown in FIG. 4 (■, ■, -1■, ■).
Then, one byte at a time from the advancing direction of the shift register 15 is taken out by the buffer 16 and written to the RAM 20 as output data 18 via the output buffer 1).

As described above, according to this embodiment, the desired rotation angle can be obtained by simply reading 72 bytes from the RAM 20, expanding it to the shift register 15, specifying the rotation angle, and simply writing 72 bytes to the RAM 20. You can rotate a single character with .

〔Effect of the invention〕

As explained above, the present invention expands all bytes of data onto the shift register at once, and in response to a specified rotation angle,
By taking out the data on this shift register one byte at a time in a predetermined direction and order, there is no need for any PID calculation processing, which was necessary in the conventional method, and in order to rotate one byte of data, Because only 1 byte is required instead of 8 bytes to be read from RAM, the rotation processing time is shortened and high-speed printing is possible.

Furthermore, since the input/output conditions are extremely simple, software can be created easily.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the main parts of a printing device according to an embodiment of the present invention. FIG. 2 is an explanatory diagram showing the order of taking out data on the register in the case of 90° left rotation. FIG. 3 is an explanatory diagram showing the order of taking out data on the register in the case of 270° counterclockwise rotation. FIG. 4 is an explanatory diagram showing the order in which data on a register is taken out via a buffer in the case of 180° left rotation. DESCRIPTION OF SYMBOLS 10... Character rotation processing circuit, 1)... Output buffer, 12... Input buffer, 13... Output counter, 14... Input counter, 15... Shift register, 15a , 15b. 15cm・-Group, 16.30...Buffer, 1
7.17a1) 7b, 17c...input data, 18
...Output data, 20...RAM, 40...Data bus, CE...Chip enable signal, RD ・
RAM readout signal, RO,...90° left rotation instruction signal, ROt...270° left rotation instruction signal, RO3...
・180° counterclockwise rotation instruction signal, ■...RAM write signal.

Claims (1)

[Claims] (1) In a character rotation processing method for a printing device that reads data stored in a memory and rotates it by a predetermined angle, a shift register of [8 x N] bits (N is a natural number) is used. Shifting the above data, expand [8 x N^2] byte data one byte at a time, and transfer the expanded [8 x N^2] byte data one byte at a time from the right angle direction of the shift register. A character rotation processing method for a printing device, characterized in that the characters are rotated to the left by 90 degrees or 270 degrees by taking them out in order, and the characters are rotated to the left by 180 degrees by taking out bytes one byte at a time from the advancing direction of the register in a predetermined order. .