STV5730A STMicroelectronics, STV5730A Datasheet - Page 7

• Manufacturer Part Number: STV5730A
• Description: Multimedia Misc On-Screen Display
• Manufacturer: STMicroelectronics
• Type: Satellite Receiverr

Specifications of STV5730A

• Maximum Operating Temperature: + 150 C
• Mounting Style: SMD/SMT
• Package / Case: SO
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
FUNCTIONAL DESCRIPTION
The STV5730A 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
- ROM character set : 128 user definable characters
incoming CVBS signal. The text is superimposed
over the CVBS input eitherin 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
STV5730A. 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 back-
ground 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
- 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 background color : 1 out of 8, charac-
- Character border color : 1 out of 8, row enabled
- Page background color : 1 out of 8
- Zoom : 3 independant zoom 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
ter and page enabled or set identical to character
color
or set identical to character color
1 to 9 and 10.
factors
CHARACTER CODE
STV5730A
0
7/20