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MC144144P bảng dữ liệu(PDF) 1 Page - Motorola, Inc |
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MC144144P bảng dữ liệu(HTML) 1 Page - Motorola, Inc |
1 / 44 page MC144144 1 MOTOROLA Advance Information Enhanced Closed-Caption Decoder 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 MOTOROLA SEMICONDUCTOR TECHNICAL DATA MC144144 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 |
Số phần tương tự - MC144144P |
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Mô tả tương tự - MC144144P |
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