2-5
2.2.1.2 Principle diagram
Figure 2-4 Working principle of the main board
2.2.1.3 Principle
The main board is connected with external ports, including the power input port, multi-way serial
port, TFT display interface, analog VGA interface, network port and analog output port. Besides,
on the main board is also a BDM interface reserved for the software debugging and software
downloading.
CPU System
CPU is the core part of the main board. It, connected with other peripheral modules through the
bus and I/O cable, implements the data communication, data processing, logical control and other
functions.
RTC
RTC provides the calendar information (such as second, minute, hour, day, month and year). CPU
can read and modify the calendar information from RTC.
Ethernet Controller
Ethernet Controller supports the IEEE802.3/IEEE802.3u LAN standard, and supports two data
transmission rate: 10Mbps and 100Mbps. CPU exchanges data with the Ethernet through the
Ethernet Controller.
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