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MC144144 bảng dữ liệu(PDF) 8 Page - Motorola, Inc |
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MC144144 bảng dữ liệu(HTML) 8 Page - Motorola, Inc |
8 / 44 page MC144144 MOTOROLA 8 • When used, INTRO can be enabled to interrupt on selected events. • When SEN pin is made LOW the part will be reset. SPI Mode • SPI mode is selected by making the SMS pin HIGH. • Acts as a slave device. • All communications are clocked in and out as 8–bit bytes. • SCK is the serial clock (input), SDA is Data In, and SDO is data out. • SEN pin enables communication. When it is LOW the SDO pin is three–state. • When SEN is brought HIGH the part will be synchronized and waiting for a command. • If SEN is tied HIGH, the part can be synchronized by a command string. • When used, INTRO can be enabled to interrupt on selected events. • When SEN and SMS pins are made LOW the part will be reset. Setup and Operational Control User Selectable Displays are: Captions, Language I, Field 1 (CC1) Captions, Language II, Field 1 (CC2) Captions, Language I, Field 2 (CC3) Captions, Language II, Field 2 (CC4) Text, Language I, Field 1 (T1) Text, Language II, Field 1 (T2) Text, Language I, Field 2 (T3) Text, Language II, Field 2 (T4) XDSG Display Mode XDSF Display Mode OSD mode (through the serial port) User Controlled Features are: Decoder ON/OFF Color or Monochrome Output EIA–608 Extended Attributes ON/OFF OSD Drop Shadow ON/OFF Text box size, Number of rows = x Text box position, Base row = y TV lines per character row, 13 or 15 Erase Timer (16 s) ON/OFF Data Output Modes (through the serial port) XDS Data Output, Raw or Filtered Selected Channel and XDS Activity Indicators Video Lock Indicator Setup Options: Horizontal timing of BOX NTSC or PAL H lock source, Video or EXT HIN V lock source, Video or EXT VIN Default Condition Following Reset Display Channel = CC1 Decoder = OFF TEXT Size = 15 Rows Lines/Row = 13 Background = BOX Extended Attrib = ON Data Outputs = OFF NTSC operation VCO Lock = Video BOX Timing = 13.5 µs Vert Lock = Video VIN/INTRO = INTRO and Disabled Horiz Lock = Video Color/Mono = Color OSD Display = Drop Shadow OSD Display = 15 Lines/Row OVERVIEW OF THE LINE 21 CLOSED CAPTION SYSTEM THE LINE 21 CLOSED–CAPTIONING SYSTEM The Line 21 closed–captioning system provides for the transmission of caption information and other text material as an encoded composite data signal during the unblanked por- tion of Line 21, field 1 of the standard NTSC video signal. In addition, a framing code is transmitted during the first half of Line 21, field 2. The encoded composite video signal for Line 21, fields 1 and 2 is shown in Figure 5. The video signal conforms to the standard synchronizing waveform for color transmission giv- en in Sub–part E, Part 73 of the FCC Rules and Regulations. Multiplexed Data Channels The Line 21, field 1 closed–caption system defines four dif- ferent data channels which can be time multiplexed within the Line 21 data stream. They are Captions — Language 1, Captions — Language 2, Text — Language 1, and Text — Language 2. Both languages may be English in either case. Field 2 has five additional data channels, two Captions, two Text, and Extended Data Services (XDS). The XDS data structure is defined in EIA–608. DATA 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 8–bit alphanumeric characters formulated according to the USA Standard Code for Information Inter- change (USASCII;x3.4–1967) with odd parity. The clock rate is 0.5035 MHz which is 32 x FH. The clock burst and data packet are 50 IRE 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. |
Số phần tương tự - MC144144 |
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Mô tả tương tự - MC144144 |
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