STV5342 datasheet(12/20 Pages) STMICROELECTRONICS

12 / 20 page

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 ORGANIZATION

Figure 9

APPLICATION NOTES

ORGANIZATION OF A PAGE-MEMORY

The organization of a page-memory is shown in

Figure 9. The STV5342 chip provides a display

format of 25 rows of 40 characters per row.

Row number twenty-four is used by the microproc-

essor for the display of information.

Row zero contains the page header.

The organization is as follows :

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 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.

STV5342

12/20

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