ST92196A datasheet(134/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

OSD CONTROLLER (Cont’d)

8.5.6.3 Foreground Palettes

The foreground palettes (Basic and Extended)

both use the same principle:

– The basic foreground palette is stored in OS-

DRAM (segment 22h) starting from 10h to 2Fh

(see Figure 59).

– The extended foreground palette is stored in OS-

DRAM (segment 22h) starting from 50h to 6Fh

(see Figure 59).

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

palette, located at even addresses between 10h

and 2Eh (even value) for the basic foreground pal-

ette, and between 50h and 6Eh (even value) for

the extended foreground one.

Figure 62. Basic Foreground Palette Mapping

Bits 15 = Free for the user

Bits 14:12 = U[2:0]

Underline mode control bits.

These bits configure the underline mode for the

dot line 12 (lines 23 and 24 if using the 18x26 ma-

trix) and line 13 (lines 25 and 26 if using the 18x26

matrix).

See Table 24.

Bits 11:9 = FT[2:0]

Foreground Translucency

These bits configure the foreground translucency

level applied to the color (refer to Section 8.5.3.11

for more details).

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

opaque (no video mixed in it on the display)

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

parent (the video is displayed instead of this color)

Bits 8:6 = FR[2:0]

Foreground Red color

These bits configure the foreground red intensity

for the color.

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

color.

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

is used in the color.

Bits 5:3 = FG[2:0]

Foreground Green color

These bits configure the foreground green intensi-

ty for the color.

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

the color.

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

sity is used in the color.

Bits 2:0 = FB[2:0]

Foreground Blue color

These bits configure the foreground blue intensity

for the color.

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

the color.

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

ty is used in the color.

FT2

FT1

FT0

FR2

FR1

FR0

FG2

FG1

FG0

FB2

FB1

FB0

10h

2Fh

U[2:0] FT[2:0] FR2

FR[1:0] FG[2:0] FB[2:0]

Color

12h

U[2:0] FT[2:0] FR2

FR[1:0] FG[2:0] FB[2:0]

14h

Color

U[2:0] FT[2:0] FR2

FR[1:0] FG[2:0] FB[2:0]

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