JPS60103396A - Data writing unit for display memory - 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 Application of the Invention J This Invention ('Data infiltration into display memory\L'j on two sides, RlG and B3 series independent on ll\Table 4
KI8 is a device for reading 1M of data into a display memory suitable for displaying data at the same time in the memory.
11! It is something to do.

[Mushrooms] Data for the commercially available H display memory for personal computer beaters 11) Loading device 4 id: In order to simultaneously load data into the independent R2O and B5 series display memories, the luminance II% information is used. 8-focus brightness (
It uses two 8-bit color information registers that provide 2 bits of data and 1111 bits of information for each color.

The three color registers that provide this color information correspond to independent R, G, and B display memories, and can be replaced with three 1-bit color registers.

Figure 1 r, ll: , 1 color register giving color information
11 corresponding to one color IC of the data writing device for the conventional display memory when pit I'f is configured.
FIG.

In FIG. 1, via the MPU1id data bus 2,
It is connected to three color 1/distaffs of independent R, G, and B three series and one C11 degree II'J information register (hereinafter referred to as a bit mask register) 8 common to the valley series, and also connected to an address bus. The blue water memory 10 (in the illustrated example, only the R series is read out to each of the 7Js) independently of the address busder 4 via the address bus 3.

Address decoder 4 /dr i'3iJfi+4
color register 7 and bit mask l/raster 8, and one input 1! of the Nante gate 9 provided corresponding to each bit of the bit mask register. ! Touch I;

Each of the color registers 7 above corresponds to the corresponding input (in 1 < memory 10
The outputs of the Nando games 1 and 9 are also connected to the display memory 10.

The conventional data↑IT writing device for display memory has the above-mentioned configuration, and the procedure for the MPU 1 to write data to the display memory 10 in order to rewrite the display screen will be explained below.

4. The MPU 1 presses the button to give the color mfII and brightness information to the two-color register 7 and the bit mask register 8.

Each address is output onto the address bus 6. Address decoder 41-J takes in this address from the near address bus 3, decodes it, and selects a color register (No.
1 and a bit mask register selection signal 5 are generated.

At the same time, the MPU 1 outputs the 1-color 4W information and the luminance fW information onto the data bus 2, so the 1-color information and the luminance i+Y information are loaded into the color register 7 and the bit mask register 8, respectively.

Next, MPU1 displays R, G, B3 series display memo +7-1
Outputs the address of the memory of one series of 0 among the stored memory onto the address bus 3. Address decoder 4//'i decodes this address and outputs display memory selection signal 6 to Nant gate 9.

At the same time, an address is also given to the 2nd display memory 10 from the MPU 1, and the content of the 1st color register 7 is transferred to the display memo IJ-1 (l: l: 1 Δ size 1).

This is the conventional table 71 data stored in memory)
! Table 7 JZ memory ＼ data i in 1 loading device i! : It's a drunkenness.

However, this method ++1tr conventional j←11″′1″
So 01↓1!1@ is put in bit mask register 8 and fc
Regarding j' direction CCi+1+l・).

Table 4< Since the bits 1 and 2 in the 1-byte memory in Memo 1J-10 are selected, the number of bits and pieces corresponding to the 1-byte memory that MPU 1 accesses to read data 111 is as follows: ”; Screen - Specify one color in the upper 8 bits 1
- Because it cannot be changed, the previous data is saved in the display memory bit corresponding to the 1st point that is missing from the top of the 9th screen.

Therefore, if you want to display a different corner 1-factor screen that is currently displayed on Jjl, if you do not erase all 7514 of both sides of 1111, you will not be able to newly display only the i side. −).

[Purpose of the invention]

The present invention was made in order to eliminate the above-mentioned drawbacks, and its purpose is to write data into the display memory in one go without going through about 14 steps. To provide a data write hit to a display memory capable of displaying both sides of a new A.

[) 41EC of '6''A, j In order to achieve the above-mentioned goal 1'', Akira Kio gave luminance information including black to the bit mask register.

The present invention is characterized in that black and one other color are simultaneously written into the display memory by supplying the logical product of the luminance information and the color information to the display memory.

[Embodiment of Foil Cutting] An embodiment of the data writing device for a display memory according to the present invention will be described below with reference to the block diagram of FIG. 2, in which the same parts as in FIG. 1 are given the same reference numerals.

In FIG. 2, one color register 7 and data bus 2 are connected to input fllll of AND gate 12 L-gr? The output side of the AND gate is connected to the input 1111 of the display memory 10. Other output Same R as in Figure 1 above? It is complete.

An embodiment of the invention consists of the above-mentioned components.

The display information diagram of FIG. 3 will be briefly described below, and its operation will be explained first. Color 1'l'l''')I to color register 7
J ” fi: 2 constant is 61■ In the f parallel device bending in Figure 1, 2) Force (, 1 by 1, simply input the luminance 1r7 + I4 into the l-mask register 8 by i'1) - r I:
1 (,!f, %The office power 11''r information including color is 111 and 1Δ is.

That is, as shown in ix 3 ryl (a), fO,1
: ') f'r,, fjfp colors (black and magenta)
Slide the dot in blue water L7, l, j Butt color information I:1
1(b). 4'. Brightness 'l l'l' IJ
kl', + originally (bow, as in Figure 11 (c),
"On 1111 GO", but black is also considered as bright information, and it is added to bit mask l/jimeta 8 as +'i result.
11110”.

-t and 't', 77F'y' ~ I-12, the logical product of the data of 11V, 1ilf +1415, and color register 7 (l-) is stored in the display memory 10. 141, it becomes possible to write black in addition to one color to the 1-byte display memory accessed by MPU1.

Therefore, without going through the process of erasing all of one screen, the same figure (
A new screen (magenta) shown in f') can be displayed.

Figure 3 is shown to make it easier to understand the above-mentioned effect. 1. For convenience, write /111I in the display memory bit corresponding to the layer dot illuminated with the desired color, and write /111I in the layer dot that is black. Corresponding display memory bits” o
'' is set to 11, and it is decided that nothing will be written to the bits of the display memory corresponding to the layer dots that left both sides of the previous layer.

〔Effect of the invention〕

As is clear from the following explanation, according to the present invention, it is possible to input black and one other color into the display memory at the same time, so once the previous screen is erased, 1
It eliminates the need to draw on the screen, and is effective in speeding up display processing, such as filling a certain area with the same color and leaving the outside of the area black.

[Brief explanation of the drawing]

FIG. 1 Data r'! for display memory using conventional 1-pit color register! A block diagram showing the circuit borrowing of the loading device, Figure 2 shows the data 111 for the display memory using a 1-bit color register by the unfired HJ. FIG. 3 is a contour diagram of the table J<If'i for the circuit operating state 1. １・・・・・・MPU ２・・・・・・ノ“-TABUS 3
...Address bus 4 ...Address decoder 5 ...Bit mask 1/gister; g, +
t'1Iqti-No. 6...l,: Non-memory series different selection ffT ke7... Enclosing register 8... Bit mask register 9... Nandoket 10... ..., +3
71, Memory 11...Color 1/ Register selection signal 1 Fig. 10''1 Fig. 3

Claims (1)

[Claims] +l) Color information is stolen from the MPU, 7) Unique R
1G, B3 series color register and brightness 11' from MPU
No f-reports are available 1. Information register 7/l and +
! 'I! Decode the address given from J il MPU 1-l-2 and select the hidden distaff option A 11 with luminance information t, +t<1rer, 1- is generated J-1 address Decoder and these two three pieces:
4 Pa 111 No. 7 Ba J11 勺三さノ When each of the above 1.
/Jista and Akira 1. (T (color information from the screen that reports i') 1 military power f1a consists of tj (Kikomi oval 1+, R, G, and B3 series display memory. ``] Nilly's illusion-J-ru data ``11 Inner device:'f VC
Including black in the previous NL::J'lt degree (11 information register, f The logical product of iJri+2 colors 'Ii'f i'l・) is supplied to the display memory K/Ji. 1 of I
l + y that the color was set to lf in 11.17
r'Data for changing display memory, +1° reading device. (2) Use a 1-pit register as a color register! 1'f Claims Ml] 4fl) Section n
Data loading device for ik's display memory.