JPS6271658A - Printer controller - Google Patents

Abstract

PURPOSE:To enable the performance of a KANJI printer to be displayed at its full capacity, by providing a printing data converting circuit between an input buffer and a page buffer, and storing 2-byte printing data into the page buffer constantly on a word basis. CONSTITUTION:Printing data sent from a host CPU (a) are once stored into a input buffer 1. A printing data converting circuit 2 so functions that a series of line controlling information, printing data and controlling information constituted of an odd number of bytes is converted into data constituted of an even number of bytes by adding a 1-byte dummy code, before storing the data into a page buffer 3. Reading from the page buffer 3 is conducted with one word (2 bytes) as a unit, he read printing data are used directly as an access code for a font memory 4 without any rearrangement, a relevant character pattern is read from the font memory 4, and is stored into an output buffer 5. After completing printing in a line, a KANJI printer (b) receives data for the next line from the output buffer, and prints the data. Accordingly, since the processing speed in reading from the page buffer 3 and the subsequent processings is enhanced, the printing data are always supplied in time.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a print data processing method (1 related to It is something.

[Conventional technology]

FIG. 3 is a diagram showing a conventional processing device disclosed in, for example, Japanese Unexamined Patent Publication No. 59-226957.
1) is the continuous register, (32) is the write register (33
is an alignment device, and (34) is a differential register.

Next, the operation will be explained. In FIG. 3, data read from the memory is stored in the alignment unit (33) via the successive register (31).

At this time, when the byte positions of the successive register and the write register are different, the difference register (34) (a difference of two byte positions is set, and the alignment device shifts the data to the right by that amount, The data is stored in another memory address via this write register.The shifted data will be stored at the second write (-).

[Problem that the invention seeks to solve]

Since the conventional processing device is configured as described above, it is necessary to set two differential registers in units of words (one word is 2 bytes), which takes processing time and requires a long time for the kanji printer to request the data to be printed. There was a problem that the printing operation was interrupted and the performance deteriorated because the printing process sometimes took a long time.

This invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a Kanji printer control device that can make full use of the performance of a Kanji printer.

[Failure to solve the problem]

The kanji printer control device according to the present invention includes a print data conversion circuit between an input buffer and a page buffer to perform high-speed processing.

[Effect]

The print data conversion circuit in this invention always stores 2-byte print data in word units in the page buffer,
Access after reading the page buffer can be sped up, and the full performance of the Kanji printer can be demonstrated.

[Embodiments of the invention]

An embodiment of the present invention will now be described with reference to the drawings.

In FIG. 1, fi+ is an input buffer that stores print data from the CPU in frame units. (
2) is a print data conversion circuit that stores 2-byte print data in word units in a page buffer; (3) is a page buffer that stores print data; (41 is a font memory that stores character patterns; (51 is a font memory) This is an output buffer that develops the character pattern read from the input buffer into figures and outputs it to the kanji printer.Also, as shown in Figure 2, the print data is read from the input buffer, the code is matched by the print data conversion circuit, and the data is stored in the page buffer C2. An example of the content is shown.

Next (: Explain the operation.Hoss in Figure 1)
The position data sent from the CPU is stored once (input buffer 1 of 11).
For row control information, print data, and data in which the number of bytes of control information is an odd number, a 1-byte dummy code is added to make even number bytes ≦ 2, and then stored in the page buffer (3). The page buffer is read in word units (2 bytes), and the read print data must be aligned.
x, it is used as it is as the font memory access code in (4), and the corresponding character pattern is extracted from the font memory and stored in the output buffer in 15). After the Kanji printer finishes printing the previous line, it receives and prints the next line of data from the output buffer.

When there is a request for print data from a kanji printer, (5
) output buffer (2 print data is stored in rλ, printing will be interrupted and performance will decrease f' knee).
(Since the page buffer read processing in step 31 and subsequent steps are processed at high speed, it is possible that the print data will not be received in time.)
Yes.

Next, a specific example will be explained in Figure @2. αυ is data sent from the host CPU, and indicates that one square is one byte. WRITE command is 1 byte, alphanumeric shift, Kanji shift is 2 bytes, alphanumeric code (A
, H, C, D, E) are 1 byte, Kanji ko) (#,
Characters, processing, processing) are a mixture of 2-byte, 1-byte, and 2-byte codes.

(The input buffer 121 stores the data sent from the host CP (1) as is. The print data conversion circuit (13) adds a 1-byte dummy code for data ending with an odd number of bytes, WRITIi, command, and E data code. and stores it in the page buffer of U.If there is no print data conversion circuit of Q3, the format of the page buffer of U4) is the same as the input buffer of 7J.For example, the Chinese code is stored in the 4th and 5th words. In order to access the font memory corresponding to the Kan code, which is stored in the 4th word, read the 4th and 5th words and combine the lower byte of the 4th word and the upper byte of the 5th word. This requires a longer processing time.

This print data conversion circuit (13) eliminates the need for the above-mentioned 2-word readout and compositing processing, and speed control processing can be performed.

In addition, in the above embodiment, the kanji printer control device handles 1 byte/
Although the processing method when 2-byte data is mixed has been described, the same effects as in the above embodiment can be achieved even with word processors and personal computers that process Japanese data.

〔Effect of the invention〕

As described above, according to the present invention, by providing the print data conversion circuit, it is possible to provide an apparatus that performs high-speed processing.

[Brief explanation of drawings]

FIG. 1 is an embodiment of the printer control device of the present invention (two-dimensional configuration diagram), FIG. 2 is an explanatory diagram of data content conversion according to the embodiment of the present invention, and FIG. 3 is the configuration of a conventional Kanji prescriptor control device. In the figure, (11 is an input buffer, +21 is a print data conversion circuit, (3) is a page buffer, (41 is a font memory, and (5) is an output buffer. Indicates the same or equivalent part.

Claims (1)

[Claims] An input buffer that stores print data containing both 1-byte and 2-byte data in word units;
A print data conversion circuit that adds a 1-byte dummy byte to the byte print data and converts the 2-byte print data so that it does not span two words, and stores the print data converted by this print data conversion circuit. A printer control device that includes a page buffer and a font memory that outputs character patterns accessed by print data in the page buffer.