參數(shù)資料
型號(hào)： SAA5647HL
廠商： NXP Semiconductors N.V.
英文描述： Enhanced TV microcontrollers with On-Screen Display (OSD)(帶全屏顯示的增強(qiáng)型TV控制器)
中文描述： 與微控制器在強(qiáng)化電視屏幕顯示（OSD）（帶全屏顯示的增強(qiáng)型電視控制器）
文件頁(yè)數(shù)： 64/112頁(yè)
文件大小： 436K
代理商： SAA5647HL
2000 Jun 30
64
Philips Semiconductors
Objective specification
Enhanced TV microcontrollers with
On-Screen Display (OSD)
SAA56xx
22.1.6.9
Fastext detection
When a packet 27, designation code 0 is detected,
whether or not it is acquired, bit TXT13.FASTEXT is set.
If the device is receiving 525-line Teletext, a
packet X/0/27/0 is required to set the flag. The flag can be
reset by writing a logic 0 into the SFR bit.
When a packet 8/30 is detected (or a packet 4/30 when
the device is receiving a 525-line transmission),
flag TXT13.PKT 8/30 is set. The flag can be reset by
writing a logic 0 into the SFR bit.
22.1.6.10 Broadcast Service Data Detection
When a packet 8/30 is detected (or a packet 4/30 when
the device is receiving a 525-line transmission),
flag TXT13. PKT 8/30 is set. The flag can be reset by
writing a logic 0 into the SFR bit.
22.1.6.11 VPS acquisition
When bit TXT0.VPS ON is set, any VPS data present on
line 16, field 0 of the CVBS signal at the input of the
Teletext decoder is error checked and stored in row 25,
block 9 of the basic page memory, see Fig.23. The device
automatically detects whether Teletext or VPS is being
transmitted on this line and decodes the data
appropriately.
Each VPS byte in the memory consists of four biphase
decoded data bits (bits 0 to 3), a biphase error flag (bit 4)
and three logic 0s (bits 5 to 7).
The most significant bit of the VPS data cannot be set to
logic 1.
Bit TXT13.VPS Received isset by the hardware whenever
VPS data is acquired.
Full details of the VPS system can be found in the
specification “Domestic Video Program Delivery Control
System (PDC); EBU Tech. 3262-E”.
22.1.7
WST
ACQUISITION
The SAA56xx family is capable of acquiring Level 1.5
625-line and 525-line World System Teletext.
22.1.8
WSS
ACQUISITION
The WSS data transmitted on line 23 gives information on
the aspect ratio and display position of the transmitted
picture, the position of subtitles and on the camera/film
mode. Some additional bits are reserved for future use.
A total of 14 data bits are transmitted.
All of the available data bits transmitted by the WSS signal
are captured and stored in SFRs WSS1, WSS2 and
WSS3. The bits are stored as groups of related bits and an
error flag is provided for each group to indicate when a
transmission error has been detected in one or more of the
bits in the group.
WSS data is only acquired when the TXT8.WSS ON bit is
set. Bit TXT8.WSS RECEIVED is set by the hardware
whenever WSS data is acquired. The flag can be reset by
writing a logic 0 into the SFR bit.
22.1.9
C
LOSED
C
APTION ACQUISITION
The US Closed Caption data is transmitted on line 21
(525-line timings) and is used for Captioning information,
Text information and Extended Data Services. Full details
can be found in the document “Recommended Practise for
Line 21 Data Service EIA-608” Closed Caption data is
only acquired when bit TXT21.CC ON is set.
Two bytes of data are stored per field in SFRs. The first
byte is stored in CCDAT1 and the second byte is stored in
CCDAT2. The value in the CCDAT registers is reset to
00H at the start of the Closed Caption line defined by
CCLIN.CS<4:0>. At the end of the Closed Caption line, an
interrupt is generated if IE.ECC is active.
The Closed Caption data is software-processed to convert
it into a displayable format.
handbook, full pagewidth
teletext page
header data
VPS
byte 11
row 25
10
11
column
0
9
MBK964
VPS
byte 12
VPS
byte 13
VPS
byte 14
VPS
byte 15
VPS
byte 4
VPS
byte 5
12
13
14
15
16
17
18
19
20
21
22
23
Fig.23 VPS data storage.
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