ST92196A datasheet(136/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

OSD CONTROLLER (Cont’d)

8.5.6.4 Background Palettes

The background palettes (Basic and Extended)

both use the same principle:

The basic background palette is stored in OS-

DRAM (segment 22h) starting from 30h to 4Fh

(see Figure 59).

The extended background palette is stored in OS-

DRAM (segment 22h) starting from 70h to 8Fh

(see Figure 59).

A 16-bit word is used to define each color in the

palette, located at even addresses between 30h

and 4Eh (even value) for the basic background

palette, and between 70h and 8Eh (even value) for

the extended background one.

Figure 63. Basic Background Palette Mapping

Bit 15 = M

Background color change bit.

This bit determines where the background color

change occurs.

0: The background color change takes effect im-

mediately.

1: The background color change occurs in the

center of the character.

Notes:

– When the preceding character is slanted (italics

on, only available in serial mode), a background

color change only occurs in the center of the

character regardless of the M bit value.

– If the M bit is used in parallel mode at the begin-

ning of a row, it is strongly recommended to in-

sert a space or null character before setting the

M bit in order to control the first half background

color.

Bits 14:12 = free for the user

Bits 11:9 = BT[2:0]

Background Translucency

These bits configure the background translucency

level applied to the color (refer to Section 8.5.3.11

for more details).

BT[2:0] = 7 means that this color will be fully

opaque (no video mixed in it on the display)

BT[2:0] = 0 means that this color will be fully trans-

parent (the video is displayed instead of this color)

Bits 8:6 = BR[2:0]

Background Red color

These bits configure the background red intensity

for the color.

BR[2:0] = 0 means that no red is used to define the

color.

BR[2:0] = 7 means that the maximum red intensity

is used in the color.

Bits 5:3 = BG[2:0]

Background Green color

These bits configure the background green inten-

sity for the color.

BG[2:0] = 0 means that no green is used to define

the color.

BG[2:0] = 7 means that the maximum green inten-

sity is used in the color.

Bits 2:0 = BB[2:0]

Background Blue color

These bits configure the background blue intensity

for the color.

BB[2:0] = 0 means that no blue is used to define

the color.

BB[2:0] = 7 means that the maximum blue intensi-

ty is used in the color.

BT2

BT1

BT0

BR2

BR1

BR0

BG2

BG1

BG0

BB2

BB1

BB0

30h

4Fh

Color

32h

34h

Color

M BT[2:0] BR2

BR[1:0] BG[2:0] BB[2:0]

M BT[2:0] BR2

BR[1:0] BG[2:0] BB[2:0]

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