JPS6383793A - Cursor display controller - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a cursor display control device suitable for use in a CRT display that displays text.

(Prior Art) The configuration and operation of a conventional device of this type will be briefly described below. First, the display data written into the text memory by the CPU is read out according to the timing given by the timing generation circuit at character display time intervals. Then, the character generator output obtained by inputting the character code and display rask position information is sent to the image signal generation circuit via the parallel-serial conversion circuit. on the other hand,
Based on cursor display position data given from the CPU to the cursor address register, cursor data is generated and output from the timing generation circuit at character display time intervals at the cursor display time, and is sent to the image signal generation circuit. The image signal generation circuit synthesizes both text and cursor data, and this signal is sent to the CRT monitor for display.

(Problem to be Solved by the Invention) In the above-mentioned conventional example, the cursor small display position is fixed at the character section position corresponding to the character position, and therefore the cursor can be moved smoothly. It looked unnatural.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a cursor display control device that allows smooth cursor movement and improves visibility by giving acceleration/deceleration characteristics to the cursor movement. purpose.

[Object of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for reading data in a text memory at character display time intervals and reading data in a cursor memory at cursor movement time intervals. A configuration in which a timing signal generation circuit that generates the timing of That is.

(Operation) The display data written into the text memory by the CPU is read out according to the timing given by the timing signal generation circuit, and is supplied to the image signal generation circuit via the character generator and shift register. The cursor data written in the cursor memory as a dot image by the data update circuit is supplied to the image signal generation circuit via the shift register in accordance with the timing given by the timing signal generation circuit. Display data and cursor data are combined in this image signal generation circuit, and a desired display appears on the CRT monitor.

By rewriting the contents of the cursor memory, the cursor can be moved smoothly, and by controlling the cursor movement time interval among the timings output by the timing signal generation circuit, the cursor movement time can be controlled.

(Example) Hereinafter, an example of the present invention will be described in detail using the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a data update control circuit, which is specifically composed of a CPU that controls the entire device. 2 is a text memory for storing display characters, and 31 is a character generator for outputting display dots based on character codes and display rask position information. 4 is a shift register for converting the output of the character generator 3 into serial dots.

Reference numeral 5 denotes a timing signal generation circuit that generates timings for reading memory, parallel/serial conversion, etc., and supplies different timing signals to the text memory 2 and a cursor memory 6, which will be described later. 6 is a cursor memory that stores a cursor in the form of a dot image, and 7 is a shift register that converts cursor display data from parallel to serial. 8 is the above text memory 2 and cursor memory 6
9 is a CRT monitor that displays text characters and a cursor in a desired form.

Note that the text memory 2 and cursor memory 6 are CPU
These are commonly connected to the internal bus 10 of
The stored contents are updated by the UI.

FIGS. 2 and 3 are diagrams cited to explain the operation of the embodiment of the present invention, and each shows the transition of the screen display and the contents of the cursor address at that time on the time axis. In addition, both FIGS. 2 and 3 are shown in comparison with the conventional example in order to help understand the embodiment of the present invention, and (a) shows the embodiment of the present invention;
(b) shows a conventional example.

FIG. 4 is also a diagram cited to explain the operation of the embodiment of the present invention, and is a diagram showing the relationship between the timing of the cursor movement time interval output from the timing signal generation circuit to the cursor memory and the cursor movement distance. be.

Hereinafter, the operation of the embodiment of the present invention will be explained in detail. First, display data written into the text memory 2 by the CPU 1 is read out from the timing signal generation circuit 5 at timings given at character display time intervals.

The output of the character generator 3, which is obtained by inputting the character code obtained here and the display rask position information output from the display controller (not shown), is transferred to the shift register 4.
is converted into a serial dot by the image signal generation circuit 8.
sent to. On the other hand, the cursor data written in the form of a dot image from the CPU 1 to the cursor memory 6 is read out from the timing signal generation circuit 5 according to the timing given by the cursor movement distance time interval, and is passed through the shift register 7 to generate an image signal. It is sent to circuit 8. The serial dot signals obtained from both the shift registers 4 and 7 mentioned above are combined in an image signal generation circuit 8, and the combined text data and cursor data are converted into an image signal and sent to a CRT monitor 9 for display. Ru.

In this case, for example, change the cursor position to ■ in Figure 2 (a).
When moving from to ■, select ■ as the intermediate position.

It is necessary to rewrite the contents of the cursor memory 6 so as to move to ■ via ■. This allows the cursor to be moved smoothly. Note that (a) and (b) shown in FIGS. 2 and 3 represent the cursor address register and cursor memory 6 based on the embodiment of the present invention and the conventional example, respectively.
It shows the timing to rewrite the contents of , which in this case is time t1""t2.

In addition, when the cursor has a long movement distance, the time interval of the cursor movement is controlled as shown in Figure 4 to provide acceleration/deceleration characteristics, which makes it easy to see even if the cursor movement speed is increased. will not be harmed.

[Effects of the Invention] According to the present invention as explained above, the following effects can be obtained.

(1) Easy-to-read display can be achieved by smoothly moving the CRT cursor.

(2) By giving acceleration/deceleration characteristics to the cursor movement, the cursor movement time can be shortened without impairing visibility.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIGS. 2 and 3 are diagrams cited to explain the operation of the embodiment of the present invention. FIG. 4 is a diagram showing the contents of the cursor address on a time axis in comparison with the conventional example, and FIG. 4 is a diagram showing the relationship between the cursor movement time interval and the cursor movement distance according to the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... CPU, 2... Text memory, 5... Timing signal generation circuit, 6... Cursor memory, 8...
...Visit image signal generation circuit. Applicant's agent Patent attorney Takehiko Suzue (a) t2ta
tb Figure 3 t× Figure 4

Claims (1)

[Claims] A text memory that stores character data to be displayed, a cursor memory that stores display cursor data, and timing for independently accessing the text memory at character display time intervals and the cursor memory at cursor movement time intervals. a timing signal generation circuit that generates data, a data update control circuit that updates data to the text memory and generates and outputs cursor data to the cursor memory, and converts display data and cursor data obtained from each of the memories to serial dots. 1. A cursor display control device comprising: an image signal generation circuit that performs composite output.