Table of Contents
Advertisement
MB86R02 'Jade-D' Hardware Manual V1.64
18.6.3 Display Color
Data processed by the display controller is of the following formats:
18.6.3.1
Indirect Color (8 bits/pixel)
Palette RAM's index. The index is displayed after being converted by Palette RAM to the image data
where each of RGB (R, G and B) is 6 bits. The palette that can be used depends on the layer.
8 bit
i
i-th entry
1 bit
If the pixel value is i, the RGB output value is determined by the i-th entry of the pallet.
The precision of each color element of the palette is 6 bits. The basic precision of display output is 8
bits for each of RGB and each color element of the palette is output to be displayed with 2 bits shifted
toward the MSB side.
18.6.3.2
Direct Color (16 bits/pixel)
The level of each of RGB is expressed by 5 bits. The basic precision of display output is 8 bits for
each of RGB and the value of each color element is output to be displayed with 3 bits shifted toward
the MSB side.
There are the ARGB and RGBA formats.
format
15
ARGB
A
RGBA
The A bit determines whether display blend is enabled or disabled.
18.6.3.3
Direct Color (24 bits/pixel)
The level of each of RGB is expressed using 8 bits. In fact, 1 pixel is expressed by 32 bits.
There are the ARGB and RGBA formats.
format
31
30
...
ARGB
A
ignored
RGBA
R
In ARGB format, whether A = 0 or A ≠ 0 (whether blend enabled or disabled) is determined using a 1-
bit value.
Palette RAM
256
A
R
G
B
entries
6 bit
6 bit
6 bit
14
13
12
11
10
R
R
25
24
23
22
...
R
G
9
8
7
6
5
G
G
17
16
15
14
...
G
B
4
3
2
1
0
B
B
A
9
8
7
6
...
1
B
ignored
0
A
18-23
Advertisement
Table of Contents
