Vizio L42HDTV10A Service Manual page 25

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
AD17
R3
V1
Y2
R4
AD22
AV22
W3
Y4 GPIO_18
W4 GPIO_14
B19 ADC_IN0
L4
Y1 GPIO_15
T2 GPIO_23
L2 RESETn
R2
T4
2. PIP/POP HARDWARE LIMITION:
CONFIDENTIAL – DO NOT COPY
Type
PWM Output
GPIO2 Output
GPIO7 Output
GPIO16 Output
GPIO3 Output
IOSCL Input / Output
IOSDA Input / Output
GPIO13 Output
Output
Output
Input
IR Input
Output
Output
Input
GPIO_1 Output
GPIO_4 Output
Description
Backlight Adjust
Panel on/off
System power
LVDS on/off
ATSC POW on/off
SDA
SCL
HDMI Switch Select
MT8293 Reset
MT8293 acknowledge to player
Key ADC detection
IR Receiver
SYSTEM EEPROM Read / Write
LED Backlight
MT8202 RESET
DTV & HDMI Select PIN
DTV & ATV Select PIN
Page 7-6
File No. SG-0198