Z90251 ZILOG [Zilog, Inc.], Z90251 Datasheet - Page 48

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

5.8
5.9
Fringing Effect
Fringing means surrounding a character with a different color than the foreground
and background colors. Refer back to Figure 8. Fringing adds visual appeal to the
character presentation.
The fringing effect is enabled or disabled in DISP_ATTR: 03h: Bank A (5).
The fringing color is set in INT_ST: 07h: Bank C (7) to either 0, the
character background color, or to 1, a RGB color specified in INT_ST: 07h:
Bank C (6,5,4). The eight RGB colors available for fringing and background
are defined in Table 21.
The fringing feature is NOT available in Progressive Mode.
Table 21 RGB Colors
Display Attribute Control
Display Attribute Control determines screen display characteristics for the entire
screen, not just the OSD area. The background that covers the entire screen is
called the Master Background. Its color setting can be used to generate a blue
screen when the TV signal is not present. Table 22 shows the Display Attribute
Register.
R
0
0
0
0
1
1
1
1
G
0
1
1
0
0
1
1
0
B
0
1
0
1
0
1
0
1
Color
Black
Blue
Green
Cyan
Red
Magenta
Yellow
White
32 KB Television Controller with OSD
PS001301-0800
40