5. Microprocessor interface
When power is supplied and power key is pressed then the rest circuit lets Reset to low state that will reset the MTK8202 to initial state. After that the Reset will transits to high state and the MTK8202 start to work that microprocessor executes the programs and configures the internal registers. The execution speed of CPU is 162 MHz.
1. The I/O ports are configured as follows：
Pin name | Function | Type | Description |
AD17 | PWM | Output | Backlight Adjust |
R3 | GPIO2 | Output | Panel on/off |
V1 | GPIO7 | Output | System power |
Y2 | GPIO16 | Output | LVDS on/off |
R4 | GPIO3 | Output | ATSC POW on/off |
AD22 | IOSCL | Input / Output | SDA |
AV22 | IOSDA | Input / Output | SCL |
W3 | GPIO13 | Output | HDMI Switch Select |
Y4 | GPIO_18 | Output | MT8293 Reset |
W4 | GPIO_14 | Output | MT8293 acknowledge to player |
B19 | ADC_IN0 | Input | Key ADC detection |
L4 | IR | Input | IR Receiver |
Y1 | GPIO_15 | Output | SYSTEM EEPROM Read / Write |
T2 | GPIO_23 | Output | LED Backlight |
L2 | RESETn | Input | MT8202 RESET |
R2 | GPIO_1 | Output | DTV & HDMI Select PIN |
T4 | GPIO_4 | Output | DTV & ATV Select PIN |
2. PIP/POP HARDWARE LIMITION:
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