參數(shù)資料
型號： SAA5697HL
廠商： NXP Semiconductors N.V.
英文描述： Enhanced TV microcontrollers with On-Screen Display (OSD)
中文描述： 與微控制器在強化電視屏幕顯示（OSD）
文件頁數(shù)： 54/116頁
文件大?。?/td> 532K
代理商： SAA5697HL
2002 May 06
54
Philips Semiconductors
Objective specification
Enhanced TV microcontrollers with
On-Screen Display (OSD)
SAA567x; SAA569x
21.5
Page clearing
Page clearing is performed on request from the Data
Capture section or the microcontroller, under the control of
the embedded software.
At power-on and reset, the whole of the page memory is
cleared. Bit TXT13.PAGE CLEARING is set while this
takes place.
21.5.1
D
ATA
C
APTURE PAGE CLEAR
When a page header is acquired for the first time after a
new page request or a page header is acquired with the
erase (C4) bit set, the page memory is ‘cleared’ to spaces
before the rest of the page arrives.
When this occurs, the space code (20H) is written into
every location of rows 1 to 23 of the basic page memory,
the appropriate packet 27 row of the extension packet
memory and the row where Teletext packet 24 is written.
This last row is either row 24 of the basic page memory (if
the TXT0.X24 POSN bit is set) or row 0 of the extension
packet memory (if the bit is not set).
Page clearing is done before the end of the TV line in
which the header arrived which initiated the page clear.
This means that the 1 field gap between the page header
and the rest of the page which is necessary for many
Teletext decoders is not required.
21.5.2
S
OFTWARE PAGE CLEAR
The software can also initiate a page clear by setting bit
TXT9.CLEAR MEMORY. Now, every location in the
memory block pointed to by TXT15.BLOCK<3:0> is
cleared to a space code (20H). Bit CLEAR MEMORY is
not latched, so the software does not have to reset it after
it has been set.
OnlyonepagecanbeclearedinaTV line.Therefore,ifthe
software requests a page clear, it will be carried out on the
next TV line on which the Data Capture hardware does not
force the page to be cleared. A flag (TXT13.PAGE
CLEARING) is provided to indicate that a software
requested page clear is being carried out. The flag is set
when a logic 1 is written to bit TXT9.CLEAR MEMORY
and is reset when the page clear has been completed.
Alllocationsareclearedto00Hifbit TXT0.INV ON = 1and
a page clear is initiated on Block 8.
21.6
Multi-page operations
When using SAA567x; SAA569x in a multi-page
application with external SRAM, bit TXT28.MULTI PAGE
should be set. This allows the 80C51 microcontroller to
copy acquired data between internal Display memory and
external SRAM without hindrance.
相關PDF資料
PDF描述
SAA5675HL Enhanced TV microcontrollers with On-Screen Display (OSD)
SAA567X Enhanced TV microcontrollers with On-Screen Display (OSD)
SAA5695HL Enhanced TV microcontrollers with On-Screen Display (OSD)
SAA569x Enhanced TV microcontrollers with On-Screen Display (OSD)
SAA5677HL Enhanced TV microcontrollers with On-Screen Display (OSD)
相關代理商/技術參數(shù)
參數(shù)描述
SAA569X 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Enhanced TV microcontrollers with On-Screen Display (OSD)
SAA5700 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Chinese Character System Teletext CCST decoder
SAA5700GP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Chinese Character System Teletext CCST decoder
SAA5731 制造商:The Stanley Works 功能描述:
SAA5X9X 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers
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