Z90251 ZILOG [Zilog, Inc.], Z90251 Datasheet - Page 47

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

Z90255 ROM and Z90251 OTP
32 KB Television Controller with OSD
39
5.7
Character Size and Smoothing Effect
The Z90255 supports four character sizes: 1X, 2X, double width, and double
height. The 2X size duplicates each pixel horizontally and vertically to reach
double size. Figure 14 shows a character at 1X, 2X without smoothing, and 2X
with smoothing.
Smoothing means enhancing a character to improve its appearance. This effect
can be applied to 2X and double width characters, and is enabled and disabled in
DISP_ATTR: 03h: Bank A (4).
Check the effect of smoothing on 2X and double width characters before finalizing
OSD programming.
1X
After Smoothing
2X
Figure 14 Smoothing Effect on 2X Character Size
PS001301-0800