ST92196A STMicroelectronics, ST92196A Datasheet - Page 134

• Manufacturer Part Number: ST92196A
• Description: 8/16-bit Mcu For Tv Applications With Up To 96k Rom, On-screen-display And 1 Or 2 Data Slicers
• Manufacturer: STMicroelectronics

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-
– The extended foreground palette is stored in OS-
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
DRAM (segment 22h) starting from 10h to 2Fh
(see
DRAM (segment 22h) starting from 50h to 6Fh
(see
15
Table
2Fh
10h
12h
14h
Figure
Figure
U2
24.
59).
59).
U1
FR[1:0] FG[2:0] FB[2:0]
FR[1:0] FG[2:0] FB[2:0] Color
FR[1:0] FG[2:0] FB[2:0]
U[2:0] FT[2:0] FR2
U[2:0] FT[2:0] FR2
U[2:0] FT[2:0] FR2
U0
FT2
FT1
FT0
Color
Color
15
FR2
0
1
8
- ON SCREEN DISPLAY CONTROLLER (OSD)
FR1
7
Bits 11:9 = FT[2:0] Foreground Translucency
These bits configure the foreground translucency
level applied to the color (refer to
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.
FR0
FG2
FG1
FG0
FB2
Section 8.5.3.11
FB1
FB0
0
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