Z90251 ZILOG [Zilog, Inc.], Z90251 Datasheet - Page 35

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

Note:
Bit 6, HV
second interrupt is issued before the first interrupt has completed processing. If
bit 6 is set to 0, bit 6 is not pending the other interrupt (H
one is in service. If bit 6 is set to 1, bit 6 is pending the other interrupt (H
V
Figures 9 is an example of second color display in the eighth row of the OSD.
Each of the small grid squares represents one pixel. Each column has two areas
for second color display. In this example, the second color is at Position 6. The
second color position for the first column has a value of 3 because the OSD is
offset from the left of the TV screen at a distance equal to 03h. Each column is
the size of one display character. Each Second color column is a half character
column. The screen position offset is added to Second color position. Because
the offset is 03h, the Second color postions begin with 3 = (3+0), 4 = (3+1), 5 =
(4+1), and so forth.
Bit/
Field
Reserved
HV
Second Color Position
SYNC
SYNC
) while one is in service.
Column increment is 0.5. Offset is 03h. System software
requires that the offset be added to the increment for the
second color in the bar display. The bar position must be
defined before the second color is enabled.
Interrupt Option
SYNC
Interrupt Option, defines the procedure for processing when a
Bit
Position
7
6
5,4,3,2,1,0
32 KB Television Controller with OSD
R/W
R/W
R/W
W
R
Value
0
1
0
1
Description
Return 1
No effect
Interrupt Pending Disabled
Interrupt Pending Enabled
Specifies start position of the
color change to the second
color.
SYNC
or V
SYNC
PS001301-0800
) while
SYNC
or
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