STV9937 Datasheet, PDF (35/49 Pages) STMicroelectronics – 120-MHz On-Screen Display for Monitors including PictureBooSTTM and 4 True Independent Window Displays

STV9937
8 General OSD Programming
General OSD Programming
8.1 Enable OSD
The OSD window displays are enabled by the ENOSD bit.
ENOSD = 1: OSD window displays are active.
ENOSD = 0: OSD window displays are inactive. Pin FBLK = 0 and pins ROUT, GOUT and
BOUT pins = 0 (bit RGBPOL is 0). The default value is 0.
Table 38: Enable OSD
FWR
FAC
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
80h
00h
ENOSD
8.2 Fade-in and Fade-out Effect
The Fade-in and Fade-out effect is used to progressively increase/decrease the OSD window to/
from its full size. This effect is enabled by the FADE bit.
FADE = 1: Fade effect is active
FADE = 0: Fade effect is inactive (default value)
Table 39: Fade
FWR
FAC
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
80h
00h
FADE
8.3 Full Screen Display
The STV9937 allows a full screen display with a selectable color programmable by the FBK bit as
follows:
FBK = 1: The video area is replaced by the color coded in bits FSR, FSG and FSB (full screen
color values). Pin FBLK is always 1.
FBK = 0: Normal video mode whether or not the OSD menu is displayed. The default value of
bit FBK is 0.
Table 40: Full Screen Registers
FWR
80h
80h
FAC
01h
03h
Default
0h
0h
Bit 7
FBK
FSR
Bit 6
FSG
Bit 5
FSB
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Table 41: Full Screen Colors
Color
Black (Default Value)
Blue
Green
FSR
0
0
0
FSG
0
0
1
FSB
0
1
0
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