Vizio P42HDTV10A User Manual
Page 38

CONFIDENTIAL – DO NOT COPY
Page 8-6
File No. SG-0184
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 MTK8205 to initial state. After that the Reset will transits to high state and the
MTK8205 start to work that microprocessor executes the programs and configures the internal
registers. The execution speed of CPU is 133 MHz.
a. The I/O ports are configured as follows:
Pin name
Function
Type
Description
AF26
VGASCL
Input / Output
AE26
VGASDA
Input / Output
AB23
REQUEST# Input / Output
AB24
READY#
Input / Output
AD22
SCL
Input / Output
AC22
SDA
Input / Output
OBO0 SOURCE Input
Key
detection
OBO1 MENU Input
Key
detection
OBO2 UP Input
Key
detection
OBO3 DOWN Input
Key
detection
OBO4 RIGHT Input
Key
detection
OBO5 LEFT Input
Key
detection
OBO6 AUTO Input
Key
detection
OBO7 POWER Input
Key
detection
OGO5 LED Output
AF24
IR
Input / Output
AE23
GPIO
Output
Power on of TV board and panel
AD23 PWM0 Output
Backlight
Adjustmance
AC23 PWM1 Output
Select
mute
AF6
ORO6
Output
RCA out mute
AE20 UP1_4 Input
S-video
Detect
AF20 UP1_3 Output
HDMI
SCDT
AE19` UP1_2 Output
YCBCRSEL
AE21 UP3_0 Output
Backlight
ON/OFF
AD21 UP3_1 Output
HDMI
CAB