JPS63264366A - Data output control apparatus - Google Patents

Abstract

PURPOSE:To omit the transmission of a character pattern from a character generator to a CPU, by directly taking the character pattern outputted to a bus over in synchronous relation to the control signal supplied by the CPU in order to generate the character pattern to apply rotary processing thereto. CONSTITUTION:A CPU 11 outputs the address signal ADR corresponding to the character code to be subjected to printing output to the address part of a bus 13 at first. Continuously, the character pattern shown by DATA as an example is read from a character generator 2 by the reading order of the CPU 11 to be outputted to the data part of the bus 13. The reading order on a control signal wire C1 is also supplied to one of input terminals of a two-output OR gate 16. At each time which the reading order is outputted to the control signal wire C1, a writing order is outputted even to a control signal wire C3 connected to a character rotating circuit 14 from the output terminal of the two-output OR gate 16 and the character pattern on the bus 13 is directly read by the character rotating circuit 14 without passing through the CPU 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a data output control device installed between a data processing device such as a personal computer and a data output device such as a printer or CRT.

Conventional technology-i involves converting character data to be output from codes into patterns, and converting print control commands from codes such as line breaks between a data processing device such as a personal computer and a data output device such as a printer. There is an output control device installed.

These output control devices include a rotation process that uses character-by-character vertical/horizontal conversion, which is used when converting a horizontally written document into a vertically written document while printing it out, or vice versa. Some have functions.

Conventionally, a data output control device equipped with a character-by-character rotation processing function as described above has a CPU 3 as shown in FIG.
1, a character generator 32, a bus 33, a character rotation circuit 34, and an output control section 35.

The CPU 31 accesses the character generator 32 via the bus 33 every time it receives character data to be printed out in code form from a host device such as a personal computer (not shown).

The character pattern output from the character generator 32 is once transferred to the CPU 31 via the bus 33.
From there, the data is further transferred to the character rotation circuit 34 via the bus 33. The rotated character pattern is transferred from the character rotation circuit 34 to the CPU 31 via the bus 33, and from there is further supplied to the printer via the bus 33 and the output control section 35.

Problems to be Solved by the Invention In the above-mentioned conventional data output control device equipped with a character rotation function, data is transferred between the CPU, character generator, character rotation circuit, and output control unit many times. . Therefore, there is a problem in that this data transfer takes time and it is not possible to improve the output speed.

Means for Solving the Problems The data output control device of the present invention directly accepts and rotates character patterns output on the bus in synchronization with the control signal supplied by the CPU to the generator for character pattern generation. It is equipped with a character rotation circuit that performs processing, and is configured to omit the transfer of character patterns from the character generator to the CPU, thereby realizing high-speed output.

Hereinafter, the operation of the present invention will be explained in detail together with examples.

Embodiment FIG. 1 is a block diagram showing the configuration of a data output control device according to an embodiment of the present invention, in which 11 is a CPU 112, a character generator, 13 is a bus, 14 is a character rotation circuit, and 15 is an output control section. , 16 is the or gate.

The CPU II receives characters to be printed out in code form from a host device (not shown) such as a personal computer. The CPU II uses the address corresponding to this character code to access the character generator 12, which is comprised of a memory such as a ROM, via the bus 1'3.

That is, as illustrated in the timing chart of FIG. 2, the CPU II first outputs an address signal ADR corresponding to the character code to be printed out to the address portion of the bus 13. Subsequently, the CPU 1 outputs a read command that goes low on the control signal line CI connected to the character generator 12. Along with this, a character pattern as exemplified by DATA in FIG. 2 is read from the character generator 12 and output to the data portion of the bus 13.

On the other hand, the read command on the control signal line C1 is also supplied to one input terminal of the two-man power OR gate 16. A control signal line C2 from the CPU 1 is connected to the other input terminal of the two-man power OR gate 16. The CPU II connects the control signal line C2 to all areas where character rotation processing is necessary.
Outputs a low signal on top. As a result, each time a read command is output on the control signal line C1, the two-man power OR gate 1
A write command falling to low is also output from the output terminal of 6 to the control signal line C3 connected to the character rotation circuit 14, and the character pattern on the bus 13 is directly read by the character rotation circuit 14 without going through the CPU II.

The character rotation circuit 14 is composed of a group of shift registers arranged in a two-dimensional array, and rotates the character pattern by 90 degrees by reading the character pattern read in the X direction from the Y direction. The rotated character pattern is transferred from the character rotation circuit 14 to bus 1 in synchronization with the read command from CPU 1.
3 and then transferred to CFull via bus 13.
The data is transferred to the output control unit 15 via the , and further transferred to the printer where it is printed out.

Although the present invention has been exemplified above in the case of printing out to a printer, the present invention can also be applied to the case of outputting character data to a display device such as a CRT.

Effects of the Invention As explained in detail above, the data output control device of the present invention uses the character pattern output on the bus to generate the character pattern in synchronization with the control signal supplied from the CPU to the generation surface. Since the character rotation circuit takes over the character pattern directly, the transfer of the character pattern from the character generator to the CPU is omitted, and the speed of output is accordingly increased.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a data output control device according to an embodiment of the present invention, FIG. 2 is a timing chart for explaining the operation of the device in FIG. 1, and FIG. 3 is a conventional character rotation function. FIG. 2 is a block diagram showing the configuration of a data output control device having the following configuration. 11...CPU (central processing unit), 12...character generator (character generation unit), 13...bus,
14...Character rotation circuit, 15...Output control unit. Patent applicant Nichiden Home Electronics Co., Ltd.

Claims (1)

[Scope of Claims] A central processing unit that receives character data to be output from a host device in the form of a code, and a character pattern corresponding to the character code received by the central processing unit that is transmitted to a bus in synchronization with a control signal from the central processing unit. A character pattern generation unit outputs the character pattern on the top, a character rotation unit directly receives the character pattern output on this bus in synchronization with the above control signal, and performs rotation processing by vertical/horizontal conversion; A data output control device comprising: an output control section that receives data via a processing section and supplies the data to a data output device.