STV5348(2004) データシートの表示（PDF） - STMicroelectronics

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STV5348
(Rev.:2004)

MONOCHIP TELETEXT AND VPS DECODER WITH 8 INTEGRATED PAGES

STMicroelectronics 

STV5348

FUNCTIONAL DESCRIPTION

Displayable Page Memory Map

The organization of a page memory is shown in

Figure 10.

The display area consists of 25 rows of 40 charac-

ters per row.

The organization is as follows:

– Row zero contains the page header:

– The first seven characters (0 - 6) are used for

messages regarding the operational status.

– The eighth character is an alphanumeric

control character either "white" or "green"

defining the "search" status of the page.

When it is "white" the operational state is

normal and the header appears white; when

it is "green" the operational state corresponds

to the "search mode" and the header appears

green.

– The following twenty-four characters give the

header of the requested page when the

system is in search mode.

– The last eight characters display the time of

day.

– Row number twenty-four is used by the

microprocessor for the display of information, or

used to display X/24 colored key data according

to R0D7 bit.

– Row twenty-five comprises ten bytes of control

data concerning the received page (see Table

9) and fourteen free bytes which can be used by

the microprocessor.

Figure 10. Page Memory Organization

t(s) 7 Status

c Characters

Fixed characters

Alphanumerics white

for normal,

green on search

24 characters from page header

rolling on page search

rodu 7

1

24

8 scrolling

time characters

8

Obsolete Product(s) - Obsolete P MAIN PAGE DISPLAY AREA

ROW

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

row free for status (R0D7 = 0) or packet X/24 (R0D7 = 1)

24

10

14

25

10 bytes for received

page information

14 bytes free

for use by µC

9/30

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