FUNCTIONAL DESCRIPTION APPENDIX
Fast R, G, B insertion : The external R, G, B insertion needs a fast switching and cannot be controlled by the software
(instruction cycle of 1 sec). The fast switching pin 16 of SCART is directly connected to the TV processor pin 45 ( Fast
blanking input ). The display is synchronised with the selected video source, i.e. to get stable R, G, B signal insertion they
must be synchronised with the selected video source.
4. ?-Controller I/O pin configuration and function
The I/O pins of the -Controller can be configured in many ways. All port functions can be individually programmed by the
controlling software.
Each I/O port pin can be individually programmed in these configurations :
Open drain
In this mode, the port can function as input and output. It requires an external pull-up resistor. The maximum allowable
supply voltage for this pull up resistor is +5V.
So in this mode it is possible to interface a 5 Volt environment like I2C while the -Controller has a 3.3 Volt supply.
Push-Pull
The push pull mode can be used for output only. Both sinking and sourcing is active, which leads to steep slopes. The
levels are 0 and Vddp, the supply voltage 3.3Volts.
High impedance
This mode can be used for input only operation of the port.
Special port for LED
Pin 10 and 11 have the same functionality as the general I/O pins but in addition, their current source and sink capacity is
8 mA instead of 4 mA. These pins are used for driving LEDs via a series current limiting resistor.
?-Controller I/O pin configuration and function table
configuration
pinnamedescription
Stand byTV on
1n.u.High impedanceHigh impedancenot used
2SCLOpen DrainOpen DrainSerial clock line
3SDAOpen DrainOpen DrainSerial data line
Push Pull / HighSIF filter switching + AM/FM
4SECAM LHigh impedance
impedance switching
Over Current Protection (Switch the set
5OCPHigh impedanceHigh impedance
OFF if the voltage on this pin is <2.3V )
Used during ATSS to measure
6RF AGC in High impedanceHigh impedance
7RF signal level.
7Key inHigh impedanceHigh impedanceLocal keyboard input
8S/SWHigh impedanceHigh impedanceexternal video switch
10Red LEDHigh impedanceOpen Drain
11Green LEDOpen DrainHigh impedance
62Audio mute Push PullHigh impedance
555 |
ACEC
DAEWOO
