MC144144

www.DataSheet4U.com MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC144144/D 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. DataSheet4U.com Wh...