THOMSON VP2750 Technical Manual page 57

PROGRAMMING AND DISPLAY
The programming circuit includes the following elements:
- Microcontroller IT001 used for programming,
- EEPROM IT004,
- Infrared receiver,
- Programming keyboard,
- Microcontroller IK001, which sends the signals from the keyboard and controls the display.
Microcontroller IT001
Remote control signals are sent via the infrared receiver to Pin 48 of IT001.
The SERVO data are output from Pin 96 and sent to display control microcontroller IK001.
At Pin 95, the clock supplies Pin 19 or 26 of IK001.
Bus I2C carries signals output from Pins 86 and 87 to the EEPROM, IT004, the tuner, and the
modulator.
IT001 RESETS IK001 from Pin 55.
An enable command at IT001 Pin 54 is sent to Pin 3 or 22 of IK01.
EEPROM IT004
This memory contains the switching points, Setup Mode, error signals from the self diagnosis,
the number of each program stored in memory, and any programming.
It is powered by the 5VE.
IK001
Microcontroller IK001 is used to control the display, and relays the keyboard commands to
IT001. It also handles control of the satellite demodulators via the infrared LEDs
(GK202/203/204) via signals output from Pin 80.
The KEY data, available on Pin 21 of IK01, are sent to Pin 97 of IT001.
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