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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