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On-Screen Display
ROM
MN102H75K/F75K/85K/F85K LSI User Manual
7.9.2
Graphics ROM Organization in Different Color Modes
The graphics layer supports up to sixteen colors, in the 16-color mode, but also
supports 2-, 4-, and 8-color modes. The smaller the number of colors, the less
ROM area required per tile. The figures in this section illustrate the ROM organi-
zation for each color mode.
The example in figure 7-10 demonstrates the graphics ROM setup for line 16 of
the code 00 data when the graphics layer is in 16-color mode. The four bits of
data for each pixel, in sheets 1, 2, 3, and 4, determine the color palette used for
that pixel.
Graphics tile
1 dot = 4 bits
= 16 colors
Bit 15
(16-color mode)
Line 1 data
Line 2 data
Line 3 data
GROMEND 7
GROMEND 6
.
GROMEND 5
.
.
GROMEND 4
GROMEND 3
GROMEND 2
Line 15 data
GROMEND 1
Line 16 data
8 bytes
Graphics tile
Bit 15
Figure 7-10 Graphics ROM Setup Example for a Single Line
173
Panasonic
16 bits
Line 1
Line 2
Sheet 4
Line 3
Sheet 3
Sheet 2
Sheet 1
Line 16
In this example, line 16 of the code 00
graphics tile is set in 16-color mode.
Bit 0
(16-color mode)
Sheet 1 bits 7 to 0
0000 0000
Sheet 1 bits 15 to 8
Sheet 2 bits 7 to 0
0000 0000
Sheet 2 bits 15 to 8
Sheet 3 bits 7 to 0
0000 0000
Sheet 3 bits 15 to 8
Sheet 4 bits 7 to 0
0000 0000
Sheet 4 bits 15 to 8
1 byte
GROMEND
Use graphics palette 7
Use graphics palette 6
Use graphics palette 5
Use graphics palette 4
Use graphics palette 3
Use graphics palette 2
Use graphics palette 1
Use graphics palette 0
Line 1
Line 2
Line 3
Line 16
Bit 0
Panasonic Semiconductor Development Company
(Setup example)
1010 1010
1100 1100
1111 0000
0000 0000
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