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Appendix
1 - IC description
1-1 TDA936x TV signal processor - Teletext decoder with embedded -Controller.
TV-signal Processor
Multi-standard vision IF circuit with alignment-free PLL demodulator
Internal (switchable) time-constant for the IF-AGC circuit
Source selection between 'Internal' CVBS and external CVBS or Y/C signals
Integrated chrominance trap circuit
Integrated luminance delay line with adjustable delay time
Asymmetrical 'delay line type' peaking in the luminance channel
Black stretching for non-standard luminance signals
lntegrated chroma band-pass filter with switchable centre frequency
Only one reference (12 MHz) crystal required for the -Controller, Teletext and the colour decoder
PAL / NTSC or multistandard colour decoder with automatic search system
Internal base-band delay line
RGB control circuit with 'Continuous Cathode Calibration', white point and black level off set
adjustment so that the colour temperature of the dark and the bright parts of the screen can be chosen
independently.
Linear RGB or YUV input with fast blanking for external RGB/YUV sources. The Text/OSD signals
are internally supplied from the -Controller/Teletext decoder
Contrast reduction possibility during mixed-mode of OSD and Text signals
Horizontal synchronisation with two control loops and alignment-free horizontal oscillator
Vertical count-down circuit
Vertical driver optimised for DC-coupled vertical output stages
Horizontal and vertical geometry processing
Horizontal and vertical zoom function for 16 : 9 applications
Horizontal parallelogram and bow correction for large screen picture tubes
-Controller
80C51 -controller core standard instruction set and timing
1 s machine cycle
32 - 128Kx8-bit late programmed ROM
3 - 12Kx8-bit Auxiliary RAM (shared with Display and Acquisition)
Interrupt controller for individual enable/disable with two level priority
Two 16-bit Timer/Counter registers
Watchdog timer
Auxiliary RAM page pointer
16-bit Data pointer
IDLE and Power Down (PD) mode
14 bits PWM for Voltage Synthesis Tuning
8-bit A/D converter
4 pins which can be programmed as general I/0 pin, ADC input or PWM (6-bit) output
- 1 -
Service manual WP-795
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