Z90251 ZILOG [Zilog, Inc.], Z90251 Datasheet - Page 43

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

Table 18 Fade Position Register 1 05h: Bank A (FADE_POS1)
Bits 3, 2, 1, and 0 define the boundary row for the fade area. The portion of
the OSD above or below the row number fades up or down, as set in Fade
Direction, ROW_SPACE(6).
The fade starts at the scan line set in FADE_POS2 (4,3,2,1,0) within the row
number set in FADE_POS1 (3,2,1,0).
Table 19 Fade Position Register 2 06h: Bank A (FADE_POS2)
Bit
R/W
Reset
Note: R = Read W = Write X = Indeterminate
Bit/
Field
Reserved
Row Number of the Screen
Bit
R/W
Reset
Note: R = Read W = Write X = Indeterminate
Bit/
Field
Reserved
Scan Line Number
7
7
R/W
R/W
1
1
Bit
Position
7, 6, 5
4, 3, 2, 1, 0
6
6
R/W
R/W
1
1
Bit
Position
7, 6, 5, 4
3, 2, 1, 0
5
5
R/W
R/W
R/W
1
1
R/W
W
R
4
4
R/W
32 KB Television Controller with OSD
R/W
R/W
R/W
W
R
Value
1
0
Value Description
3
3
R/W
R/W
Description
Return
No effect
Scan Line Number of a row
0
0
Return
No effect
OSD Row number for fading
2
2
1
R/W
R/W
1
0
0
1
1
R/W
R/W
PS001301-0800
0
0
0
0
R/W
R/W
0
0
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