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MC144144 PDF预览

MC144144

更新时间: 2024-10-28 04:40:59
品牌 Logo 应用领域
摩托罗拉 - MOTOROLA 解码器
页数 文件大小 规格书
44页 568K
描述
Enhanced Closed-Caption Decoder CMOS

MC144144 数据手册

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XDSG Display Mode (channel grazing):  
Network Name, Call Letters,  
Program Name,  
Program Length, Time In Show  
XDSF Display Mode (full information):  
XDSG Display Mode information plus:  
Program Type (only basic types),  
Program Description.  
INTRODUCTION  
THE MC144144 DECODER  
The MC144144 is a stand alone integrated circuit, capable  
of processing VBI data from both fields of the video when the  
data conforms to the transmission format defined in the Tele-  
vision Decoder Circuits Act of 1990 and in accordance with  
the EIA–608.  
The Line 21 data stream can consist of data from several  
data channels multiplexed together. Field 1 has four data  
channels, two Captions and two Text. Field 2 has five addi-  
tional data channels, two Captions, two Text, and Extended  
Data Services (XDS). The XDS data structure is defined in  
EIA–608.  
Control Port Data Display Modes  
In addition to displaying data extracted from Line 21 of the  
incoming video, the MC144144 can display information sup-  
plied through its serial port. This is referred to as the on–  
screen display (OSD) mode. This mode provides:  
OSD display can use all Video Data Display modes and  
features.  
In this document, the term “user” refers to the television or  
VCR designer. The user may choose to make certain option-  
al features selectable by the viewer. These features then be-  
come viewer options.  
Additional graphics features available.  
Double high and double wide characters available.  
Information may be placed anywhere on the screen.  
OSD display can be locked to an external V signal, if  
desired, to provide an OSD display when no video is  
present.  
DATA TRANSMISSION FORMAT  
The composite data signal contained within the active por-  
tion of the VBI line consists of a seven–cycle sine–wave  
clock run–in burst, a start bit, and 16 bits of data. These 16  
bits consist of two 7–bit characters and control codes, with  
odd parity, that conform to the FCC closed caption decoder  
requirements and EIA–608. The clock rate is 0.5035 MHz  
Character Set  
The MC144144 has a new character set with extended  
features. For example:  
New font with lowercase letters having descenders.  
Optional display mode using drop shadow.  
EIA–608 extended characters.  
EIA–608 background and foreground attributes.  
Special framing and graphics for OSD display.  
Double high and double wide character display for OSD.  
Fifteen scan lines per character row for OSD and TEXT.  
which is 32 x F . The clock burst and data packet are 50 IRE  
H
units peak–to–peak and are filtered to a “2T” response. Data  
is sent with the least significant bit (bit b0) being sent first and  
the most significant bit (bit b7, the parity bit) being sent last.  
MC144144 FEATURE SUMMARY  
The primary features of the MC144144 are briefly de-  
scribed below.  
Serial Communications Interface  
Communications and control of the MC144144 are  
through a serial control interface. Two serial control modes  
are available with the MC144144 performing as a slave de-  
vice. These modes are:  
VBI Data Processing  
The MC144144 extracts the data in Line 21 of the incom-  
ing video. All data channels in both fields are handled. Spe-  
cifically, the MC144144 can:  
2
A two–wire, I C interface.  
Process data from both fields of Line 21 simultaneously.  
Display data from any data channel.  
Output XDS data through the serial port while displaying  
selected data.  
A three–wire, serial peripheral interface (SPI).  
Five pins are dedicated to the control port function and one  
pin can be configured to provide an interrupt output. These  
pins are designated as:  
Output XDS data raw or filtered.  
XDSfilterparametersuserselectablefromalistofpre–pro-  
grammed values.  
SMS = Serial mode select.  
SCK = Serial port clock for either serial mode.  
2
SDA = Serial port data for I C mode and data In for  
NTSC or PAL operation selectable.  
SPI mode.  
2
SDO = Serial data out for SPI mode. Not used in I C  
Video Data Display Modes  
mode.  
The data extracted from the incoming video may be dis-  
played in different ways, according to the user selection and  
the type of data. The display features available are:  
2
SEN = SPI mode enable signal. Must be HIGH for I C  
mode.  
VIN/INTRO = INTRO mode = Interrupt output on  
selected event (when used).  
Ten different data display modes, CC1–CC4, T1–T4, and  
two XDS displays.  
2
I C Mode  
Pop–on, Paint–on, and Roll–up CAPTION displays.  
TEXT display default is a full–screen, 15–row display.  
User able to vertically reduce and reposition the TEXT dis-  
play as desired.  
2
I C mode is selected by bringing the SMS pin LOW and  
SEN pin HIGH.  
Acts as a slave device.  
SDA and SCK pins are the data and clock lines of this port.  
Color or Monochrome display mode selectable.  
MC144144  
7
MOTOROLA  

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