STV5730 ST Microelectronics, STV5730 Datasheet - Page 7

• Manufacturer Part Number: STV5730
• Description: MULTISTANDARD ON-SCREEN DISPLAY FOR VCR
• Manufacturer: ST Microelectronics

FUNCTIONAL DESCRIPTION
The STV5730 operates in ”mixed mode” or ”full
page mode” :
- Mixed mode : the device is line locked to the
- Full page mode : the device generates a colored
It performs the following text features :
- Page composition : 11 rows X 28 characters
- Number of displayed characters : 308 (max)
- Character composition : 12 dots X 18 lines
1 - THE INTERNAL RAM BUFFER
It stores the page (i.e. the text definition) and the row attributes.
1.1 - Page
The page includes 11 row buffers, numbered from 0 to 10. Each row buffer includes 28 characters,
numbered from 0 to 27. The characters may be written one by one by the microprocessor for random access.
They also may be written sequentially, starting with any character address.
1.2 - Character Format and Attributes
CHARACTER CODE : 1 character out of 128 from the character ROM
BK
R/G/B
BE
incoming CVBS signal. The text is superimposed
over the CVBS input either in B&W or translucent.
It may also be superimposed in color by using the
R/G/B outputs.
PAL or NTSC CVBS output and simultaneous
R/G/B outputs.Both ”normal full page” and ”video
full page” modes are supported by the STV5730.
In the ”normal full page” the screen background
is uniformely colored, while the ”video full page”
mode permits to display the unlocked VIDEO IN
signal in the screen background area.
BE
11
10
: BE=0 :
R
BE=1 :
G
9
: BK=0 : character blink disabled
: Character color :
the character background is disabled
the character background is enabled
BK=1 : character blink enabled
000
001
010
011
100
101
110
111
B
8
black
blue
green
cyan
red
magenta
yellow
white
BK
7
6
- ROM character set : 128 user definable characters
- Screen display positions : 58 horizontal positions,
- Row position offset , each row : Xoffset from 0 to
- Display enable : each row or page
- Character color : 1 out of 8, each character
- Character backgroundcolor : 1 out of 8, character
- Character border color : 1 out of 8, row enabled
- Page background color : 1 out of 8
- Zoom : 3 independantzoom factors for rows 0,
- Zoom factors : four independant X and Y zoom
- Blink : character and page enabled
- Blink frequency : 0.5 or 1.0 second
- Blink duty cycle : 0.25, 0.5 or 0.75
63 vertical positions
+15, Yoffset from -17 to +17
and page enabled or set identical to character
color
or set identical to character color
1 to 9 and 10.
factors
CHARACTER CODE
STV5730
0
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