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ST92185B2 Datasheet(PDF) 111 Page - STMicroelectronics

Part # ST92185B2
Description  16K/24K/32K ROM HCMOS MCU WITH ON-SCREEN-DISPLAY
PDF  178 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST92185B2 Datasheet(HTML) 111 Page - STMicroelectronics

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ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont’d)
7.4.6 Display Memory Mapping Examples
The display content is stored in TDSRAM, (2 to 8K
bytes starting at address 8000h). Use register
TDPR R252 (FCh) Page 32 to address the memo-
ry blocks containing the display data. Two 4-bit ad-
dress pointers (bits PG and HS) must be given that
point to separate blocks containing the display
page and the header/status rows.
Alternatively, the PG and HS pointers can be writ-
ten to the TDPPR R246 Page 33 and TDHSPR
R247 Page 33 registers.
7.4.6.1 Building a Serial Mode Full Page 40-
Char Display
Page Location:
The 1 Kbyte block of page content is stored in the
TDSRAM location pointed to by the PG3..PG0
bits.
Header & Status Rows Location:
The 0.5 Kbyte block containing the Header, Status
Row 0 and Status Row 1 is pointed to by the
HS3..HS0 bits.
Row Scrolling Buffer Location:
The scrolling buffer corresponds to the 40 bytes
following the Row 23 when the scrolling feature is
used.
Figure 69. Serial Mode (40 Characters) - Page Mapping
Figure 70. Serial Mode (40 Characters) - Header and Status Mapping
1K TDSRAM
Row 1
Row 23
Scrolling Buffer
Free Space
Resolution 1K bytes
Block
Number(1K)
TDSRAM
Address (hex)
TDPR
Value (hex)
PG3..PG0
0
8000
0
1
8400
2
2
8800
4
3
8C00
6
4
9000
8
5
9400
A
6
9800
C
7
9C00
E
6K
2K
8K
0.5K TDSRAM
Header
Status Row 0
Free Space
Resolution 0.5K bytes
Block Number
(0.5K)
TDSRAM
Address (hex.)
TDPR Value
(Hex.) HS3..HS0
0
8000
0
1
8200
1
2
8400
2
3
8600
3
4
8800
4
5
8A00
5
6
8C00
6
7
8E00
7
8
9000
8
9
9200
9
10
9400
A
11
9600
B
12
9800
C
13
9A00
D
14
9C00
E
15
9E00
F
Status Row 1
6K
2K
8K



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