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参数资料
| 型号： | MC144144P |
| 厂商： | MOTOROLA INC |
| 元件分类： | 颜色信号转换 |
| 英文描述： | Digital Signal Processors 44-JLCC -55 to 125 |
| 中文描述： | COLOR SIGNAL DECODER, PDIP18 |
| 封装： | PLASTIC, DIP-18 |
| 文件页数： | 1/44页 |
| 文件大小： | 565K |
| 代理商： | MC144144P |
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MC144144
1
Advance Information
CMOS
The MC144144 is a Line 21 closed–caption decoder for use in television
receivers or set–top decoders conforming to the NTSC standard. Capability for
processing and displaying all of the latest standard Line 21 closed–caption
format transmissions is included. The device requires a closed–caption
encoded composite video signal, a horizontal sync signal, and an external
keyer to produce captioned video. RGB and box signal outputs are provided,
which along with the mode select, allow simple interfacing to either color or
black–and–white TV receivers.
Display storage is accomplished with an on–chip RAM. A modified ASCII
character set, which includes several non–English characters, is decoded by an
on–chip ROM. An on–screen character appears as a white or colored dot matrix
on a black background.
Captions (video–related information) can be up to four rows appearing
anywhere on the screen and can be displayed in two modes: roll–up, paint–on,
or pop–on. With rollup captions, the row scrolls up and new information appears
at the bottom row each time a carriage return is received. Pop–on captions work
with two memories. One memory is displayed while the other is used to
accumulate new data. A special command causes the information to be
exchanged in the two memories, thus causing the entire caption to appear at
once.
When text (non–video related information) is displayed, the rows contain a
maximum of 32 characters over a black box which overwrites the screen.
Fifteen rows of characters are displayed in the text mode.
An on–chip processor controls the manipulation of data for storage and
display. Also controlled are the loading, addressing, and clearing of the display
RAM. The processor transfers the data received to the RAM during scan lines
21 through 42. The operation of the display RAM, character ROM, and output
logic circuits are controlled during scan lines 43 through 237. The functions of
the MC144144 are controlled via a serial port which may be configured to be
either I2C or SPI.
Conforms to FCC Report and Order as Amended by the Petition for
Reconsideration on Gen. Doc. 91–1
Conforms to EIA–608 for XDS Data Structure
Supports Four Different Data Channels for Field 1 and Five Different Data
Channels for Field 2, Time Multiplexed within the Line 21 Data Stream:
Captions Utilizing Languages 1 and 2, Text Utilizing Languages 1 and 2
and XDS Support
Output Logic Provides Hardware Underline Control and Italics Slant Generation
Single Supply, Operating Voltage Range: 4.75 to 5.25 V
Supply Current: 20 mA (Preliminary)
Operating Temperature Range: 0 to 70
°
C
Composite Video Input Range: 0.7 to 1.4 V p–p
Horizontal Input Polarity: Either Positive or Negative
Internal Timing and Sync Signals Derived from On–Chip VCO
In this document, the term ‘user’ refers to the television or VCR designer. The user may choose to make certain optional features selectable by
the viewer. These features then become viewer options.
This document contains information on a new product. Specifications and information herein are subject to change without notice.
Order this document
by MC144144/D
SEMICONDUCTOR TECHNICAL DATA
P SUFFIX
PLASTIC DIP
CASE 707
ORDERING INFORMATION
18
1
MC144144P
Plastic DIP
PIN ASSIGNMENT
HIN
BLUE
GREEN
VSS
LPF
CSYNC
VIDEO
SMS
SEN
SCK
SDO
BOX
RED
RREF
VSS(A)
VDD
VIN/INTRO
SDA
14
15
16
17
18
10
11
12
13
5
4
3
2
1
9
8
7
6
Motorola, Inc. 1995
REV 1
11/95
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