參數(shù)資料
型號: TDA938X
廠商: NXP Semiconductors N.V.
英文描述: TV signal processor-Teletext decoder with embedded m-Controller
中文描述: 電視信號處理器與嵌入式米圖文電視解碼器控制器
文件頁數(shù): 42/140頁
文件大?。?/td> 570K
代理商: TDA938X
Philips Semiconductors
Preliminary specification
1999 Sep 28
42
TV signal processor-Teletext decoder with
embedded
μ
-Controller
TDA 935X/6X/8X series
TXT D
ISPLAY MEMORY
SFR
ACCESS
The Display memory when in TXT mode is configured as 40 Columns wide by 25 Rows and occupies 1K x 8bits
of memory (see Figure 16). There can be a maximum of 10 display pages. Using TXT15:Block<3:0> and
TXT15:Micro Bank, the required display page can be selected to be written to. The row and column within that
block is selected using TXT9:R<4:0> and TXT10:C<5:0>. The data at the selected position can either be written
or read from by either writing to or reading from TXT11:D<7:0>.
Figure 16 TXT Memory Map
When ever a read or write is performed on TXT11, the row values stored in TXT9 and column value stored in
TXT10 are automatically incremented. For rows 0 to 24 the column value is incremented upto a maximum of
39, at which point it resets to 0 and increments the row counter value. When row 25 column 23 is reached the
values of the row and column are both reset to 0.
Writing values outside of the valid range for TXT9 or TXT10 will cause undetermined operation of the auto-
incrementing function for accesses to TXT11.
C
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
24
25
0
39
0
9
23
Control Data
None Displayable data
Row 25, Col 10 = Reserved.
Column
10
20
30
Active Position TXT9:R<4:0>=01h, TXT10:C<5:0>=0Ah, TXT11=43h
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