Z90251 ZILOG [Zilog, Inc.], Z90251 Datasheet - Page 49

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

Table 22 Display Attribute Register 03h: Bank A (DISP_ATTR)
Bit 7, Display Enable, disables or enables using foreground and background
color, and therefore character display. When this bit is set to 0, effective space
characters are sourced from the video RAM. Background On/Off and row
background color are programmed independently. When bit 7 is set to 1, the
actual video RAM characters are displayed.
Bit 6, Master Background Enable, disables or enables using a background color
for the entire screen instead of the broadcast signal. If this bit is set to 1, the
incoming video signal blanks and the screen background displays color according
to the background color bits. The color is specified in bits 2, 1, 0. If bit 6 is set to
0, the incoming video signal is displayed.
Bit
R/W
Reset
Note: R = Read W = Write X = Indeterminate
Bit/
Field
Character Display
Master
Background Enable
Fringe Effect Enable
Smoothing Effect
Enable
RGB Polarity
Red Master
Background
Green Master
Background
Blue Master
Background
7
R/W
0
Bit
Position R/W
7
6
5
4
3
2
1
0
6
R/W
0
5
R/W
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
4
32 KB Television Controller with OSD
R/W
Value
0
0
1
0
1
0
1
0
1
0
1
3
R/W
0
Description
Disable Character Display
Enable Character Display
No Master Background
Incoming video is swapped with
the background color
Fringe Effect is Disabled
Fringe Effect is Enabled
Smoothing enabled
Smoothing disabled
Positive
Negative
See Table 21
See Table 21
See Table 21
2
R/W
0
1
R/W
PS001301-0800
0
0
R/W
0
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