Z90251 ZILOG [Zilog, Inc.], Z90251 Datasheet - Page 33

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

5.2
Horizontal Position Register
The Horizontal Position Register sets the horizontal start position of the OSD
(Table 7). The unit of measure for placement is the number of pixels from the left
of the display screen.
Table 10 Horizontal Position Register 02h:Bank A (HOR_POS)
The value required for this register can be computed using the following equation:
HOR_POS
Position Register (HOR_POS). The default value is 3h. When the value is 3h, the
OSD is at the left-most OSD position on the screen.
H
H
Second Color Feature
Second Color feature is the logical division of each column into two parts along
each row for changing foreground color. The number of each half-column is called
the Second Color Position.
Bit
R/W
Reset
Note: R = Read W = Write X = Indeterminate
Register Field
Progressive mode
Reserved
Horizontal position
POS
POS
HOR_POS = (H
is the number of pixels from the left of the screen to the OSD start position.
must be a positive integer with a minimum value of 5 incrementing by 4.
When working with Progressive mode, fringing does not work
with 2X mode or double height mode, nor does Mesh work the
same way as in Interlace mode.
represents the contents of bits 5,4,3,2,1,0 of the Horizontal
7
R/W
0
POS
Bit Position R/W
7-------
-6------
5,4,3,2,1,0
6
- 1) / 4
R/W
1
5
R/W
0
R/W
R
W
R/W
4
32 KB Television Controller with OSD
R/W
Data
0
1
0
3
Description
Normal
Support progressive sync inputs
Return 1
No effect
Horizontal position control
R/W
0
2
R/W
0
1
R/W
PS001301-0800
1
0
R/W
1
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