STV5342 데이터 시트보기 (PDF) - STMicroelectronics
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STV5342 Datasheet PDF : 20 Pages
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STV5342
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.
PAGE MEMORY ORGANIZATION
Figure 9
7 Status
Characters
Fixed characters
Alphanumerics white
for normal,
green on searc h
24 characters from page header
rolling on page search
8 scrolling
time characters
ROW
7
1
24
8
0
1
2
3
4
5
6
7
8
9
10
11
MAIN PAGE DISPLAY AREA
12
13
14
15
16
17
18
19
20
21
22
23
this row always free for status
24
10
14
25
12/20
10 bytes for received
page information
14 bytes free
for use by µC
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