On-Screen Display
ROM
MN102H75K/F75K/85K/F85K LSI User Manual Panasonic Semiconductor Development Company
173
Panasonic
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.

Figure 7-10 Graphics ROM Setup Example for a Single Line
Line 1 dataLine 2 dataLine 3 data
.
.
.
Line 15 dataLine 16 data 8 bytes
GROMEND7
GROMEND6
GROMEND5
GROMEND4
GROMEND3
GROMEND2
GROMEND1
GROMEND
Sheet 1 bits 7 to 0
Sheet 1 bits 15 to 8
Sheet 2 bits 7 to 0
Sheet 2 bits 15 to 8
Sheet 3 bits 7 to 0
Sheet 3 bits 15 to 8
Sheet 4 bits 7 to 0
Sheet 4 bits 15 to 8
1 byteGraphics tile
Sheet 4
Sheet 3
Sheet 2
1 dot = 4 bits
= 16 colors
Bit 15 Bit 0
16 bits
Line 16
Line 1
Line 2
Line 3
(16-color mode)(16-color mode)
0000 0000
0000 0000
0000 0000
0000 0000

1010 1010

1100 1100

1111 0000

0000 0000
(Setup example)
Use graphics palette 0Use graphics palette 1Use graphics palette 2Use graphics palette 3Use graphics palette 4Use graphics palette 5Use graphics palette 6Use graphics palette 7
Bit 0
Bit 15
Graphics tileLine 1Line 2Line 3Line 16In this example, line 16 of the code 00graphics tile is set in 16-color mode.
Sheet 1