4.4.3 Clock Module
The real time clock circuit which is composed of real time clock and battery, is to
realize the function of real time clock on CPU board.
4.4.4 Interface Module
CPU communicates with the CPU extension board via various bus interfaces on CPU
board. The sockets on CPU board are, J2, J3 and J10; the sockets on CPU extension
board are J5, J6 and J4.
4.5 CPU Extension Board
4.5.1 Overview
The CPU extension board realizes some functions of the CPU external interfaces.
Such as:
USB functions;
LCD driver control;
Touchscreen control;
Recorder serial port communication;
Hummer control;
PC serial port communication.
In the meantime, the CPU extension board receives the command and completes the
following tasks:
Control and driving of the moving parts;
Checking of the input signal;
Data collection;
Data transfer of the CPU board.
The function graph is shown in the following figure:
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