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MTV048

On-Screen-Display Controller for CRT/LCD Monitor

Unspecified 

MYSON

TECHNOLOGY

MTV048

(Rev 0.9)

column characters could be displayed on screen and the odd column characters will be hidden.

ATTRIBUTE Bytes:

Attribute registers, (ROW 0 ~ 14, COLUMN 0 ~ 29),

B7

B6

B5

B4

B3

B2

B1

B0

- BGR/BOX2 BGG/BOX1 BGB/BOX0 BLINK R

G

B

BGR, BGG, BGB : These three bits define the background color for their individual relative address

characters. If these three bits are set to (0, 0, 0), no background will be shown

(transparent). Therefore, a total of 7 background colors can be selected.

BOX2-0 - Select the character button boxes format of its relative address character.

= 0, 0, 0 ⇒ Button boxes is disabled.

= 1, 0, 0 ⇒ Start of depressed button box which is more than 1 character button box.

= 1, 0, 1 ⇒ Start of depressed button box which is only 1 character button box.

= 1, 1, 0 ⇒ Start of raised button box which is more than 1 character button box.

= 1, 1, 1 ⇒ Start of raised button box which is only 1 character button box.

= 0, 1, 0 ⇒ Middle of button box.

= 0, 0, 1 ⇒ End of button box.

BLINK = 1 ⇒ Enable blink effect for its relative address character. And the blinking is alternate per 32

vertical frames.

= 0 ⇒ Disable blink effect for its relative address character.

R, G, B - These three bits are used to specify their individual relative address character foreground color.

3.7 Character Button Boxes Generator

There are 4 character button box generators to generate 4 different types of button boxes including

depressed button box with only 1 character, depressed button box with more than 1 character, raised button

box with only 1 character, and raised button box with more than 1 character. The button boxes format is

defined by (BOX2, BOX1, BOX0) bits of attribute bytes. And these bits are described as below:

1). (1, x, x) means the start of character button box, and than BOX1-0 bits define the format of button box.

2). (0, 1, 0) means the middle of character button box.

3). (0, 0, 1) means the end of character button box.

The length of button box is also software control by (BOX2, BOX1, BOX0) bits. For example, if there is 1

raised button box whose length is equal to 6 characters, these BOX2-0 bits will be (1, 1, 0), (0, 1, 0), (0, 1, 0),

(0, 1, 0), (0, 1, 0), (0, 0, 1). And if there is 1 depressed button box whose length is equal to 4 characters,

these BOX2-0 bits will be (1, 0, 0), (0, 1, 0), (0, 1, 0), (0, 0, 1). That is, (0, 1, 0) command's number defines

the button box length. And only 1 byte, the attribute byte of button box start character, should be modified

when changing button box type from raised button to depressed button, or vice versa. This is very easy and

useful for software programming.

3.8 Character ROM

MTV048 character ROM contains 384 characters and symbols including 360 standard fonts, 8 user fonts and

16 multi-color fonts. The 360 standard fonts are located from address 0 to 359. The 8 user fonts are located

from address 360 to 367.And the 16 multi-color fonts are located from address 368 to 383. Each character

and symbol consists of 12x18 dots matrix.

Rev 0.9

-8-

2001/03/15

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