STV5345 datasheet(13/25 Pages) STMICROELECTRONICS

13 / 25 page

APPLICATION NOTES

ORGANIZATION OF A PAGE-MEMORY

The organization of a page-memory is shown in

Figure 10.

The STV5345 chip provides a display format of 25

rows of 40 characters per row.

The organizationis 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 ”search mode” and the header

appears green. The following twenty-four charac-

ters give the header of the requested page when

the system is in search mode. The last eight char-

acters display the time of day.

Row number twenty-four is used by the microproc-

essor for the display of information.

Row twenty-five comprises ten bytes of control

data concerning the received page (see Table 1)

and fourteen free bytes which can be used by the

microprocessor.

724

this row always free for status

ROW

8 scrolling

time characters

24 characters from page header

rolling on page search

Fixed characters

Alphanumerics white

for normal,

green on searc h

7 Status

Characters

MAIN PAGE DISPLAY AREA

14 byte s free

for use by

µC

10 bytes for received

page information

PAGE MEMORY ORGANISATION

Figure 10

STV5345 - STV5345/H - STV5345/T

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