JPS5843774B2 - Mojihiyoujihoushiki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a character display method suitable for use as a peripheral device or a terminal device of a computer system.

Conventionally, in this type of character display device, in order to divide the display portion, many complicated programs have been constructed using software.

Therefore, it is necessary to reserve a program area for display division in the main memory of the data processing device, which has the disadvantage that the program area that can be used by the user is restricted accordingly.

Moreover, once the number of sections and area range of the display section are determined, they cannot be changed without reprogramming, resulting in a lack of flexibility.The present invention solves the above-mentioned drawbacks inherent in the conventional technology. Therefore, the purpose of the present invention is to eliminate the channel numbers for each section necessary for dividing the display area in the character display device.
By using a partition control table that stores upper limit line number and lower limit line number information, and issuing commands to change the contents of the partition control table in software, the number of partitions can be easily changed without restricting the program area that the user can use. The object of the present invention is to provide a new character display method that can change the area range.

The above object of the present invention is to set a division control table storing a channel number, an upper limit line number, and a lower limit line number that define a display area in a character display device, and change the contents of the division control table according to a program instruction. A character display characterized in that the number of display sections and the range of areas are changed by changing the number of display sections and the range of areas, and the display area of display characters is determined only by specifying a channel number until the division control table is changed by the next program command. This is achieved through a method.

Next, a preferred embodiment of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In the figure, reference numeral 101 indicates a microcontrol circuit, which analyzes input information from a processing device (not shown) and inputs information to a line register 104, a character register 105, and a playback buffer memory 106. It sets operation commands in the command register 103, accesses the storage device 102, and reads and writes control information.

The storage device 102 has a division control table that stores channel numbers, upper limit line numbers, and lower limit line numbers that define each section for screen division, which is the essential part of the present invention.

The line register 104 is a register that specifies a line on the display section 114, and accesses the line when writing display character information to the playback buffer memory 106 that stores display character information.

The character register 105 is a register that specifies a column on the display section 114, and accesses the column, that is, the character position when writing display character information to the reproduction buffer memory 106.

The playback buffer memory 106 stores character information to be displayed on the display section 114, and has a capacity of N lines x M characters/line.

Character generator 109 is playback buffer memory 1
06 information into the form of character expression that we use on a daily basis.

The parallel/serial conversion circuit 110 converts parallel information from the character generator 109 necessary for actually displaying characters on the display section 114 into a serial bit pattern.

The synchronization and timing generation circuit 112 generates synchronization signals to the display section 114, that is, vertical and horizontal synchronization signals, or generates necessary timing within the character display device.

The line counter 107 and the character counter 108 sequentially access the playback buffer memory 106 from row address O to N-1 and from column 0 to M-1 of each row, except when writing the contents to the playback buffer memory 106. Therefore, the playback buffer memory 10
6 on the display section 114.

Now, when the software issues a division information transfer command, a channel number corresponding to each division to be divided, an upper limit line number of each division, and a command including lower limit line number information, the microcontroller 1
01 stores the above information in the division control table of the storage device 102.

The contents of the partition control table when partitioning into N partitions are
As shown in the figure.

To simplify the explanation, it is assumed that the display section 114 displays information of 8 lines x 8 characters/line, and it is divided into channel 1 and channel 2. is defined as 4 to 7 lines.

In this case, the division control table in the storage device 102 is written as shown in FIG. 3 by a software division information transfer command.

Next, when the command to display a message in the section corresponding to channel 1, the number of data, and the data comes from the software, the microcontroller 101 reads the upper limit line number O and lower limit line number 3 of channel 1, and the upper limit line number 0. is set in line register 104, and at the same time character register 1 is set.
Initialize 05 to O.

The micro control circuit 101 also controls the line register 104 and character register 1 of the playback buffer memory 106.
Store the message in the location addressed by 05.

The micro control circuit 101 has a playback buffer 106 for one character.
The contents of the character register 105 are updated each time data is written to the character register 105, and the number of data given by the software is
It is checked whether the value becomes 0 by subtracting it one by one, and when it becomes 0, data writing to the playback buffer memory 106 is finished.

The next operation is performed until this count reaches O.

When the 0th row of the playback buffer 106 is filled with data, the microcontroller 101 sets the character register 105 to 0.
and updates the contents of the line register 104 to 1.

In this way, the microcontroller 101 continues to register 1 until the line register 104 becomes equal to the lower limit row number 3 of channel 1.
The messages are updated one by one and the messages are written up to line 3 of the playback buffer memory 106.

Next, when a command to display a message in the section corresponding to channel 2 is received, the message is played in the order described for channel 1 from line 4 of the sofa memory 106 until the number of data given by the software reaches O. is written and displayed on the display section 114.

Although the above explanation has been given for the case where the display section 114 is divided into two parts to make it easier to understand, the case where the display section 114 is divided into N parts will also be easily understood.

As explained above, the present invention provides a character display device with a division control table that stores the channel number, upper limit line number, and lower limit line number for screen division, so that screen division control can be easily performed and software programs can be executed. It has a very reducing effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram for explaining one embodiment of the character display method according to the present invention, FIG. 2 is a diagram showing a division control table secured in the storage device shown in FIG. 1, and FIG. A diagram showing an example of a division control table when the display section is divided into two parts,
FIG. 4 is a diagram showing the display section when actually divided. 101...Micro control circuit, 102...
...Storage device, 103...Instruction register, 10
4... Line register, 105... Character register, 106... Playback buffer memory, 107... Line counter, 108...
...Character counter, 109...Character generator, 110...Parallel-serial conversion circuit, 111...Video amplifier, 112...
...Synchronization and timing generation circuit, 113...
Deflection amplifier, 114...display section.

Claims (1)

[Claims] 1. Setting a division control table that stores the channel number, upper limit line number, and lower limit line number that define the area of the display section in the character display device, and changing the contents of the division control table according to the program instructions to change the display area. A character display method characterized in that the display area of a display character is determined only by specifying a channel number until the number and range of the area are changed and the division control square is changed by the next program command.