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參數(shù)資料
| 型號(hào)： | SAA569x |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Enhanced TV microcontrollers with On-Screen Display (OSD) |
| 中文描述： | 與微控制器在強(qiáng)化電視屏幕顯示（OSD） |
| 文件頁(yè)數(shù)： | 52/116頁(yè) |
| 文件大?。?/td> | 532K |
| 代理商： | SAA569X |
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2002 May 06
52
Philips Semiconductors
Objective specification
Enhanced TV microcontrollers with
On-Screen Display (OSD)
SAA567x; SAA569x
21.4
Addressing memory
The memory can be addressed by the microcontroller in
two ways, either directly using a MOVX command or via
SFRs, depending on what address is required.
The dedicated Auxiliary RAM, and Display memory in the
range 8000H to 86FFH can only be accessed using the
MOVX command.
The Display memory in the range 2000H to 47FFH can
either be directly accessed using the MOVX command, or
via the SFRs.
21.4.1
TXT D
ISPLAY MEMORY
SFR
ACCESS
When in TXT mode (see Fig.16), the Display memory is
configured as 40 columns wide by 25 rows and occupies
1K
×
8-bit of memory. There can be a maximum of
12 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 be read or written
using TXT11.D<7:0>.
Whenever 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 up to 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 the valid range for TXT9 or TXT10
will cause undetermined operation of the
auto-incrementing function for accesses to TXT11.
21.4.2
TXT D
ISPLAY MEMORY
MOVX
ACCESS
For the generation of OSD displays that use this mode of
access, it is important to understand the mapping of the
MOVX address onto the display row and column value.
This mapping of row and column onto address is shown in
Table 22. The values shown are added onto a base
address for the required memory block (see Fig.16) to give
a 16-bit address.
Table 22
Column and row to ‘MOVX’ address (lower 10 bits of address in hexadecimal)
ROW
row 0
row 1
:
:
row 23
row 24
row 25
COL. 0
000
020
:
:
2E0
300
320
.....
.....
.....
:
:
.....
.....
.....
COL. 23
017
037
:
:
3F7
317
337
.....
.....
.....
:
:
.....
.....
COL. 31
01F
03F
:
:
2FF
31F
COL. 32
3F8
3F0
:
:
340
338
.....
.....
.....
:
:
.....
.....
COL. 39
3FF
3F7
:
:
347
33F
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| SAA5677HL | Enhanced TV microcontrollers with On-Screen Display (OSD) |
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| SAA5700 | 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Chinese Character System Teletext CCST decoder |
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