ST92196A datasheet(132/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

OSD CONTROLLER (Cont’d)

8.5.6.1 Underline Color Set 1 (USC1)

Address in Segment 22h: 04h (Bits 15:8), 05h (Bits 7:0)

To support “windows-like” button effects, the color

of the 2 (or 4 in 18x26 matrix) bottom dot lines of a

character row may be defined using the Underline

attributes. Two dedicated 2-byte words define 2

color sets, “Underline color set 1” called “UCS1”

and “Underline color set 2” called “UCS2”. They

are used by the Underline mode in addition to the

current foreground color.

This provides a four color choice for both rows 12

and 13 (9x13 character matrix) or pair of rows 23-

24 and 25-26 (18x26 character matrix): none

(background), foreground, UCS1 or UCS2, as

shown in Table 24.

The UCS1 data is mapped in a fixed OSDRAM lo-

cation (See Figure 59).

Bits 15:12 = Free for the user

Bits 11:9 = U1T[2:0]

Underline color set 1 Translu-

cency

These bits configure the background translucency

level applied to the color (refer to Section 8.5.3.11

for more details).

U1T[2:0] = 7 means that this color will be fully

opaque (no video mixed in it on the display)

U1T[2:0] = 0 means that this color will be fully

transparent (the video is displayed instead of this

color)

Bits 8:6 = U1R[2:0]

Underline color set 1 Red

color

These bits configure the background red intensity

for the color.

U1R[2:0] = 0 means that no red is used to define

the color.

U1R[2:0] = 7 means that the maximum red intensi-

ty is used in the color.

Bits 5:3 = U1G[2:0]

Underline color set 1 Green

color

These bits configure the background green inten-

sity for the color.

U1G[2:0] = 0 means that no green is used to de-

fine the color.

U1G[2:0] = 7 means that the maximum green in-

tensity is used in the color.

Bits 2:0 = U1B[2:0]

Underline color set 1 Blue

color

These bits configure the background blue intensity

for the color.

U1B[2:0] = 0 means that no blue is used to define

the color.

U1B[2:0] = 7 means that the maximum blue inten-

sity is used in the color.

U1T2

U1T1

U1T0

U1R2 U1R1

U1R0

U1G2

U1G1

U1G0

U1B2

U1B1

U1B0

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