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2. Hardware platform description
2.1. I/P board PCBA（Refer to picture 1）
The I/P board PCBA contains circuitry that manages the major functions of the RPTV, including video ,
computer signal , deinterlacing,DCDi,PIP , HDCP and keypad IR signal processing.
The 8052 microprocessor
A 8052 CPU controls the projector system functions. The processor operates on 5.0 VDC power at a clock
frequency of 24.0 MHz
The CPU reads and writes to all of the system peripherals to control system functions through its 8-bit data bus or
two-wire I 2 C bus. The CPU connects directly to the Flash ROM,EEPROM VDu, deinterlace, tuner ,scaler,
DMD..... to check status, change modes and initialize the devices. The CPU also provides the ability to draw
menus. It accomplishes this by writing data directly to external OSD IC.
The video decoder
The video decoder on the controller ECA includes composite video , S-video and Ycbcr signal processing. The
video decoder section does the actual selection of which video input to use for display. The I/O section transmits
the signals to the TV decoder section CPU VPC 32300 at all times. Both inputs are hard-wire terminated in 75Ω.
ESD protection is provided for both video inputs to protect the input stages from externally produced discharges.
The signal from either source is sent through a decoder and on to the digital video bus.
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