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參數(shù)資料
| 型號： | SAA5290A |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Economy teletext and TV microcontrollers |
| 中文描述： | 經(jīng)濟圖文電視和電視微控制器 |
| 文件頁數(shù)： | 24/33頁 |
| 文件大?。?/td> | 360K |
| 代理商： | SAA5290A |
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February 1995
24
Philips Semiconductors
Preliminary specification
One page Economy Teletext/TV
microcontroller
SAA5290
Teletext acquisition
The SAA5290 is able to acquire 625-line World System
Teletext. Teletext is acquired under control of the on-board
80C51 microcontroller. Pages are requested by writing a
series of bytes into the TXT3 SFR which corresponds to
the number of the page required. The bytes written into
TXT3 are put into a small RAM with an auto-incrementing
address. The start address for the RAM is set using the
SFR TXT2 register. Table 13 shows the contents of the
page request RAM.
If the ‘DO CARE’ bit for part of the page number is set to
logic 0 then that part of the page number is ignored when
the acquisition section is deciding whether a page being
received off air should be stored or not. For example if the
‘DO CARE’ bits for the 4 subcode digits are all set to
logic 0 then every subcode version of the page will be
captured.
When the ‘HOLD' bit is set to logic 0 the acquisition section
will not recognize any page as having the correct page
number and no pages will be captured.
Table 13
Register map for page requests (TXT3); note 1
Note
1.
X = don't care.
START
COLUMN
PRD4
PRD3
PRD2
PRD1
PRD0
0
DO CARE
Magazine
DO CARE
Page tens
DO CARE
Page units
DO CARE
Hours tens
DO CARE
Hours units
DO CARE
Minutes tens
DO CARE
Minutes units
HOLD
MAG2
MAG1
MAG0
1
PT3
PT2
PT1
PT0
2
PU3
PU2
PU1
PU0
3
X
X
HT1
HT0
4
HU3
HU2
HU1
HU0
5
X
MT2
MT1
MT0
6
MU3
MU2
MU1
MU0
Page memory organization
The acquired teletext packets each contain 40 bytes of
data and one packet is stored in each row of the text
memory. The page memory organization is given in Fig.5.
Rows 0 to 23 form the teletext page; Row 24 is available
for status messages and FLOF/FASTEXT prompt
information.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAA5290PS | Economy teletext and TV microcontrollers |
| SAA5290ZP | One page Economy Teletext/TV microcontroller |
| SAA5291PS | Economy teletext and TV microcontrollers(經(jīng)濟的圖文電視和TV控制器) |
| SAA5296APS | Economy teletext and TV microcontrollers(經(jīng)濟的圖文電視和TV控制器) |
| SAA5296PS | Economy teletext and TV microcontrollers(經(jīng)濟的圖文電視和TV控制器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA5290PS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers |
| SAA5290ZP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:One page Economy Teletext/TV microcontroller |
| SAA5290ZP/NV | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:One page Economy Teletext/TV microcontroller |
| SAA5291 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers |
| SAA5291A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers |
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