Z90251 ZILOG [Zilog, Inc.], Z90251 Datasheet - Page 53

• Manufacturer Part Number: Z90251
• Description: eZVision 200 Television Controllers with OSD
• Manufacturer: ZILOG [Zilog, Inc.]

Table 24 Color Palette Selection Bits
There are eight different foreground/background palettes, including the
that reads the color(s) from the
Color Table and Color Index Register
Table 25 lists the bits in the Color Index Register.
Table 25 Color Index Register 09h: Bank C (CLR_IDX)
When the Color Index has a value other than 000h, the value indicates the
number of the color palette that contains the RGB foreground and background
colors to be displayed. In the Color Palette register descriptions below, the
following notation is used:
Color Index, Bit [10:8]
000
001
010
011
100
101
110
111
Bit
R/W
Reset
Note: R = Read W = Write X = Indeterminate
Bit/
Field
Reserved
Color Index
Data
Bit
Position R/W
7, 6, 5, 4
3, 2, 1, 0
7
R/W
1
R/W
6
W
Function
Selects background/foreground color in row attribute
Selects color palette 0 in the color look-up table
Selects color palette 1 in the color look-up table
Selects color palette 2 in the color look-up table
Selects color palette 3 in the color look-up table
Selects color palette 4 in the color look-up table
Selects color palette 5 in the color look-up table
Selects color palette 6 in the color look-up table
R
R/W
1
Value Description
ROW_ATTR
5
R/W
1
Return 1
No Effect
Bit 3 defines MSb of the character pointer data bit
and bit [2:0] for character color data bits
4
32 KB Television Controller with OSD
R/W
register mapped into video RAM.
1
3
R/W
0
2
R/W
0
1
R/W
PS001301-0800
0
000h
0
R/W
case
0
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