Daewoo DTC-14D9T Service Manual page 34

IC DESCRIPTION
TV signal processor-Teletext decoder with embedded -Controller
TDA9345 PS-N3; TDA9346 PS-N3
-Controller
¥ 80C51 m-controller core standard instruction set and
timing
¥ 1 ms machine cycle
¥ 32 - 64Kx8-bit (TDA9345) or 64 - 128Kx8-bit (TDA9346)
late programmed ROM
¥ 3Kx8 (TDA9345) or 12Kx8 (TDA09346)-bit Auxiliary
RAM (shared with Display)
¥ Interrupt controller for individual enable/disable with two
level priority
¥ Two 16-bit Timer/Counter registers
¥ One 16-bit Timer with 8-bit Pre-scaler
¥ WatchDog timer
¥ Auxiliary RAM page pointer
¥ 16-bit Data pointer
¥ Stand-by, Idle and Power Down modes
¥ 14 bits PWM for Voltage Synthesis Tuning
¥ 8-bit A/D converter
¥ 4 pins which can be programmed as general I/O pin,
ADC input or PWM (6-bit) output
Data Capture
¥ Text memory for 1 or 10 pages
¥ In the 10 page version inventory of transmitted Teletext
pages stored in the Transmitted Page Table (TPT) and
Subtitle Page Table (SPT)
¥ Data Capture for US Closed Caption
¥ Data Capture for 525/625 line WST, VPS (PDC system
A) and Wide Screen Signalling (WSS) bit decoding
¥ Automatic selection between 525 WST/625 WST
¥ Automatic selection between 625 WST/VPS on line 16 of
VBI
¥ Real-time capture and decoding for WST Teletext in
Hardware, to enable optimized m-processor throughput
¥ Automatic detection of FASTEXT transmission
¥ Real-time packet 26 engine in Hardware for processing
accented, G2 and G3 characters
¥ Signal quality detector for video and WST/VPS data
types
¥ Comprehensive teletext language coverage
¥ Full Field and Vertical Blanking Interval (VBI) data
capture of WST data
Display
¥ Teletext and Enhanced OSD modes
¥ Features of level 1.5 WST and US Close Caption
¥ Serial and Parallel Display Attributes
¥ Single/Double/Quadruple Width and Height for
characters
¥ Scrolling of display region
¥ Variable flash rate controlled by software
¥ Enhanced display features including overlining,
underlining and italics
¥ Soft colours using CLUT with 4096 colour palette
¥ Globally selectable scan lines per row (9/10/13/16) and
character matrix [12x10, 12x13, 12x16 (VxH)]
¥ Fringing (Shadow) selectable from N-S-E-W direction
¥ Fringe colour selectable
¥ Contrast reduction of defined area
¥ Cursor
¥ Special Graphics Characters with two planes, allowing
four colours per character
¥ 32 software redefinable On-Screen display characters Æ 4
WST Character sets (G0/G2) in single device (e.g.Latin,
Cyrillic, Greek, Arabic)
¥ G1 Mosaic graphics, Limited G3 Line drawing characters
¥ WST Character sets and Closed Caption Character set
in single device
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APPENDIX