STV5730A データシートの表示（PDF） - STMicroelectronics

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STV5730A

MULTISTANDARD ON-SCREEN DISPLAY FOR VCR, PAY-TV, SATELLITE RECEIVER

STMicroelectronics 

STV5730A

FUNCTIONAL DESCRIPTION

The STV5730A operates in ”mixed mode” or ”full

page mode” :

- Mixed mode : the device is line locked to the

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.

- Full page mode : the device generates a colored

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.

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

- Screen display positions : 58 horizontal positions,

63 vertical positions

- Row position offset , each row : Xoffset from 0 to

+15, Yoffset from -17 to +17

- Display enable : each row or page

- Character color : 1 out of 8, each character

- Character background color : 1 out of 8, charac-

ter and page enabled or set identical to character

color

- Character border color : 1 out of 8, row enabled

or set identical to character color

- Page background color : 1 out of 8

- Zoom : 3 independant zoom factors for rows 0,

1 to 9 and 10.

- Zoom factors : four independant X and Y zoom

factors

- Blink : character and page enabled

- Blink frequency : 0.5 or 1.0 second

- Blink duty cycle : 0.25, 0.5 or 0.75

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

11

10

9

8

7

6

0

BE

R

G

B

BK

CHARACTER CODE

CHARACTER CODE : 1 character out of 128 from the character ROM

BK

: BK=0 : character blink disabled

BK=1 : character blink enabled

R/G/B

: Character color :

000 black

001 blue

010 green

011 cyan

100 red

101 magenta

110 yellow

111 white

BE

: BE=0 : the character background is disabled

BE=1 : the character background is enabled

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