Z90251 Datasheet, PDF (43/97 Pages) Zilog, Inc. – eZVision 200 Television Controllers with OSD

Z90255 ROM and Z90251 OTP
32 KB Television Controller with OSD
35
Table 18 Fade Position Register 1 05h: Bank A (FADE_POS1)
Bit
7
6
5
4
3
2
1
0
R/W
Reset
R/W R/W R/W R/W R/W R/W R/W R/W
1
1
1
1
0
0
0
0
Note: R = Read W = Write X = Indeterminate
Bit/
Field
Bit
Position R/W Value Description
Reserved
7, 6, 5, 4 R
W
Return 1
No effect
Row Number of the Screen 3, 2, 1, 0 R/W
OSD Row number for fading
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
7
6
5
4
3
2
1
0
R/W
R/W R/W R/W
Reset
1
1
1
Note: R = Read W = Write X = Indeterminate
R/W
0
R/W
0
R/W R/W R/W
0
0
0
Bit/
Field
Reserved
Scan Line Number
Bit
Position R/W
7, 6, 5
R
W
4, 3, 2, 1, 0 R/W
Value
Description
Return 1
No effect
Scan Line Number of a row
PS001301-0800