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On-Screen Display
Setting Up the OSD
MN102H75K/F75K/85K/F85K LSI User Manual
To set up the text display colors:
Write to the fields described below.
CCOL[3:0] (COL bits 3 to 0 in the RAM data) sets the color of the charac-
ter. This value is in reference to the selected color palette (CPT0–CPTF).
BCOL[3:0] (COL bits 7 to 4 in the RAM data) sets the background color.
As with CCOL, this value is in reference to the selected color palette
(CPT0–CPTF).
FRAME (COL bit 9 in the RAM data) enables character outlining when
set to 1. Set the outline color in the FRAME color palette (x'007FA2').
CSHAD (COL bit 10 in the RAM data) enables character shadowing when
set to 1. Set the shadowing color in the FRAME color palette (x'007FA2').
This function is unavailable in the closed-caption mode.
BSHAD[1:0] (COL bits 12 to 11 in the RAM data) enables character box
shadowing. This function is unavailable in the closed-caption mode.
00 and 01: No box shadowing
10: Upper left white and lower right black shadows
11: Upper left black and lower right white shadows
CPT0–CPTF (x'007F80'–x'007F9E') specifies the colors available for
text foreground and background colors.
FRAME (x'007FA2') specifies the color for outlining or character shadowing.
BBSHD (x'007FA4') specifies the "black" color for box shadowing.
WBSHD (x'007FA6') specifies the "white" color for box shadowing.
To set up functions applying to all layers:
Write to the fields described below.
Color background function
The color background function allows you to fill the television screen areas that
are uncovered by the OSD display (text, graphics, or cursor layers) with any
color. Specify the color in the COLB register (x'007FA0').
COLB (x'007F08', bit 7) enables the color background function when set to 1.
COLB (x'007FA0') specifies the color of the background.
Transparency
The TRPT bit allows you to make the color 0 transparent in all the palettes (CPT0,
GPT10, and GPT20). RGB, YM, and YS are all output at 0 levels for that color. See
figure 7-21.
TRPT (x'007F08', bit 10)
0: Make color 0 on all palettes transparent
1: Output color 0 as specified
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