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參數(shù)資料
| 型號： | SAA5254P |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 圖文 |
| 英文描述： | Integrated VIP and teletext decoder IVT1.1X |
| 中文描述： | TELETEXT DECODER, PDIP40 |
| 文件頁數(shù)： | 14/36頁 |
| 文件大小： | 805K |
| 代理商： | SAA5254P |
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1996 Nov 07
14
Philips Semiconductors
Preliminary specification
Integrated VIP and teletext decoder
(IVT1.1X)
SAA5254
ON-CHIP MEMORY
SAA5254 page memory organization
The organization of the page memory is shown in Fig.7. The device provides an additional row as compared with first
generation decoders; this brings the display format up to 40 characters by 25 rows. Rows 0 to 23 form the teletext page;
Row 24 is available for software generated status messages and FLOF/FASTEXT prompt information.
Fig.7 Basic page memory organization.
MBA274
7 characters
for status
8 characters
always rolling
(time)
fixed character
written by IVT hardware
alphanumerics white for normal
alphanumerics green when looking
for display page
7
1
8
24
24 characters from page header
rolling when display page looked for
5
to
20
0
1
2
3
4
ROW
21
22
23
24
25
MAIN PAGE DISPLAY AREA
PACKET X / 22
PACKET X / 23
PACKET X / 24 STORED HERE IF R0D7 = 1
14
10
10 bytes for
received
page information
14 bytes
free for use
by microcontroller
Fig.8 Organization of the extension memory.
MBA275 - 2
PACKET X / 24 if R0D7 = 0
PACKET X / 27 / 0
PACKETS 8 / 30 / 0 to 15
1
0
2
ROW
R
EMARK TO
Fig.7
Row 0
Row 0 is for the page header. The first seven columns
(0 to 6) are free for status messages. The eighth is an
alphanumeric white or green control character, written
automatically by the SAA5254 to give a green rolling
header when a page is being looked for. The last eight
characters are for rolling time.
Row 25
The first 10 bytes of Row 25 contain control data relating
to the received page as shown in Table 5. The remaining
14 bytes are free for use by the microcontroller.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAA5261 | 10-page intelligent teletext decoders |
| SAA5262PS | 10-page intelligent teletext decoders |
| SAA5261PS | 10-page intelligent teletext decoders |
| SAA5262 | 10-page intelligent teletext decoders |
| SAA5263 | 10-page intelligent teletext decoders |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA5261 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:10-page intelligent teletext decoders |
| SAA5261PS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:10-page intelligent teletext decoders |
| SAA5262 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:10-page intelligent teletext decoders |
| SAA5262PS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:10-page intelligent teletext decoders |
| SAA5263 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:10-page intelligent teletext decoders |
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