JPS628192A - Cursor control circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cursor control circuit in a raster scan type ORτ display device that displays characters, figures, and image patterns.

2. Description of the Related Art Conventionally, a CRT display device that displays characters, figures, and image patterns has been used as a terminal device for interactive operation, and there are 9 device input areas on the screen, and to clearly indicate the position.
Showing cursor. FIG. 6 shows a block diagram of a conventional example. In FIG. 6, 601 is a main control unit, which controls block addresses for display, controls the rask address generation unit, sets block addresses for displaying a cursor in the cursor display block address register, and stores cursor pattern data in the cursor pattern memory. Write. Reference numeral 602 denotes a display raster address generation unit, which generates a raster address synchronized with screen display and outputs it to the cursor pattern memory eoe. 6
Reference numeral 03 denotes a display block address generation unit, which generates a block address for display to be given to the comparator 604 ic.

A comparator 604 compares the display block address from the display block address generation unit 603 with the block address for displaying the cursor set in the cursor display block address register 105.
06o6 is a block address register for cursor display, which controls whether or not to access the next stage cursor pattern memory depending on whether or not they match.
4 is given the block address where the cursor will be displayed. A cursor pattern memory 606 is a memory that temporarily stores a cursor pattern to be displayed. 60
7 is a P/S converter, and a cursor pattern memory 60
This converts the parallel data of the cursor pattern read from 6 into serial data.

In the conventional explanation, kx/J dot (k,
7I is a natural number) is assumed to be one display block, and data in one access to the cursor pattern memory is assumed to be one dot. For cursor display, a display block address is given to the cursor display block address register, and a line address within the display block is given to the cursor pattern memory. FIG. 2 (1) shows one display block. Figure 2(b)
The kXJ dots shown in FIG. 2 (IL) are taken as one display block, and the display block addresses in one screen are shown with an address assigned to each block in one screen. Second
In the figure, the number of display blocks displayed on one screen is n blocks in the horizontal direction and 1 block in the vertical direction, a total of n×m blocks (n and m are natural numbers).

In the conventional example, first, the main control unit 601 sets the block address for displaying the crane in the cursor display block address register 605, and then stores the block address in the cursor pattern memory l.
A cursor pattern is written in the display rask address generator 602 and the display block address generator 60.
3 is provided with a synchronization signal necessary for address generation and synchronized with lock and screen display.

In the display block address generation section 603, the main control section 6
Under the control of Yoshi 01, a block address synchronized with the screen display is generated and output to a comparator 604. In the comparator 604, when the generated block address matches the address set in the cursor display block address, the cursor pattern memory 604
06 is given information that the block addresses match.

Similarly, the display rask address generation unit 602 generates a rask address synchronized with screen display and outputs it to the cursor pattern memory 606. Cursor pattern memo I7
At 606, when information is provided from comparator 604 that the block addresses match, memory is accessed and data is read out in a cursor pattern from memory according to the rask address. The k-dot cursor pattern data is converted into serial data by a P/FS converter 607 and output.

Problems to be Solved by the Invention In such a conventional cursor control circuit, when displaying a plurality of different cursors, for example, when displaying a cursor surrounding an arbitrary size area as shown in FIG. requires a cursor pattern memory containing the dots of the entire area block, memory must be used for areas other than displaying as a cursor, and writing from the main control section of the cursor pattern also requires the entire area. This may be wasteful in practice, such as having to perform this on the corresponding memory.

Means for Solving the Problems In order to solve the above problems, the present invention provides a first memory for storing a plurality of cursor patterns, a means for generating a display address, and a means corresponding to the display address. and a second memory that is accessed as a display address, and the content of the address corresponding to the display address of the second memory is
By storing information on whether to access the memory of the cursor and information on selecting one of the plurality of cursor patterns, it is possible to efficiently display a plurality of different cursors.

Effect: By the above means, at least one type of cursor pattern is stored in the first memory, and information regarding cursor display is stored in the contents of the memory address corresponding to the address of the block where the cursor is displayed in the second memory. By doing this, you can CR at least one type of cursor.
A plurality of them can be displayed at any arbitrary position on T.

Embodiment A block diagram of an embodiment of the present invention is shown in FIG.
Information regarding cursor display is written to the location memory, and cursor pattern data is written to the cursor pattern memory 105. 102 is a display raster address generation unit, and cursor pattern memory 1
Generates a raster address to be given to 05. Reference numeral 103 is a display block address generation section, which generates a block address to be given to the location memory 104.

Reference numeral 104 is a location memory, which has an address corresponding to a block address for display, and data related to cursor display is stored in the contents of the address.
The deer vine pattern memory 105 is controlled by the output data from this memory. A cursor pattern memory 106 is a memory that temporarily stores cursor data to be displayed. 108 is a P/S conversion unit;
It converts the parallel data of the cursor butter read out from the cursor pattern memory 105 into serial data.

In the description of the embodiment, it is assumed that kxl dots of display pixels constitute one display block, and data in one access to the cursor pattern memory is assumed to be one dot.

The case where a cursor is displayed surrounding a rectangular area as shown in FIG. 3 on a CRT will be described below. ．．
3-2t 3-3. Write the pattern data of 3-4 to different addresses in the cursor pattern memory,
In addition, information on accessing the cursor pattern memory to the address of the location memory corresponding to the address of the block where the above four types of cursors are to be displayed, and reading out the cursor pattern to select one of the four cursor patterns. Write the information that gives the starting address. Further, the display raster address generation section 102 and the display block address generation section 103 are given a synchronization signal necessary for address generation and for synchronizing locking and screen display.

In the display block address generation section 103, the main control section 1
A block address synchronized with the screen display is generated under the control of o1 and Yoshi, and is given to the location memory 104. In the location memory 104, the content of the address corresponding to the block address is read out, and when the accessed block address is a block for displaying a cursor, the cursor pattern memory 106 is accessed and the read start address of the cursor pattern memory 106 is read out. will give.

The display raster address generation unit 102 is connected to the main control unit 101.
The cursor pattern memory 105 generates a raster address synchronized with the screen display under the control of Cursor and pattern data are read.

The data read from the cursor pattern memory 105 is in bits, and this data is converted into serial data by the P/S converter 106 and output.

As described above, according to this embodiment, by providing the location memory 104 related to cursor display control, the ability to specify a rectangular area is increased. 4 that responded
A memory for storing various kinds of cursor pattern data is sufficient, and display of a rectangular area requires only writing cursor display information to the location memory 104, which allows efficient memory use. In addition, changing the rectangular area, such as moving the rectangular area or changing the size of the rectangular area, can be done quickly by simply rewriting the contents of the location memory 104, so the cursor shown in Figure 3 can be moved dynamically within the screen. Can move quickly.

In addition, when enclosing a rectangular area with a frame as shown in FIG. 4, the cursor pattern memory 4-1, 4-2. 4
-3. 4-4. 4-51 4-6.4-714-8
It can be realized in the same manner as above by combining these eight types of patterns in the location memory.

Next, an application example of the embodiment using the present invention will be described.

Currently, a CRT display device is used as a terminal device for interactive operation, and a figure, etc. is displayed on the CRT screen according to a certain coordinate system, and a point on the figure is indicated with a cursor, and the point at the cursor position is There are cases where you need to know the coordinates of.

In this case, with conventional hardware configurations, the coordinate values of the cursor could only be displayed at a specific location on the screen. Therefore, the operator is inconvenienced in that the cursor and the cursor coordinate value display positions are not at the same location and cannot be viewed at the same time.

However, in this embodiment, as shown in FIG. 5, the coordinate values of the cursor can be displayed at the same location as the cursor display position, and can be moved on the screen together with the cursor.

That is, as a left-hand pattern, the instruction cursor 5-
The pattern of 1 and the number pattern of 0 to 9 are stored in the cursor pattern memory 105, and the pattern of the cursor 6-1 and the coordinate values are stored in the address of the location memory 104 corresponding to the block address for displaying the cursor and its coordinate values. It is sufficient to store information to display a numeric pattern. Furthermore, in Figure 6, move the cursor to (7
) to (a), it is only necessary to rewrite the contents of the location memory, so the cursor can be moved quickly.

As described in detail, the present invention provides the following effects.

(1) When displaying multiple cursors of one pattern on a CRT, the cursor pattern memory contains only that one cursor pattern, and information regarding cursor display is stored in the location memory at multiple block addresses to be displayed. If there are two or more types of cursor patterns, it is sufficient to store each cursor pattern in the cursor pattern memory, and the memory can be used very efficiently.

(2) Changes such as movement of the cursor displayed on the CRT can be made quickly because it is only necessary to rewrite the location memory.

(3) In practical use, a cursor of any size and various patterns can be displayed on a CRT, and the cursor can be moved and patterns changed quickly, so the human-machine interface can be improved compared to the conventional one. .

[Brief explanation of drawings]

Fig. 1 is a block diagram of a cursor control circuit according to an embodiment of the present invention, Fig. 2 (11) is a state diagram showing display pixels in one display block, and Fig. 2 (b) is a display in one screen. FIG. 3 is a state diagram showing block addresses, FIG. 4 is a state diagram showing a cursor that can be expressed on a CRT when the present invention is implemented, and FIG. It is. 101...Main control unit, 102...Display rask address generation unit, 103...Display block address generation unit, 104...Location memory, 106... ...Cursor pattern memory, 106
...P/S conversion section. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure #I3 Figure 4 Figure 5

Claims (1)

[Claims] A first memory for storing a plurality of cursor patterns to be displayed on a CRT, means for generating a display address, and a second memory accessed in correspondence with the display address; storing information on whether or not to access the first memory and information on selecting one of the plurality of cursor patterns in the contents of an address corresponding to the display address in the second memory; A cursor control circuit featuring: