Example: PIC with EM203
Below is an annotated schematic, showing how one would go about connecting an EM203A device to a PIC (Programmable Interrupt Controller -- a type of common controller chip). The PIC is used merely as an example -- the information below applies to any similar connection.
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Note that the pins shown below are not all of the pins an EM203A has. There are other pins, which are not used in this example.  | 
Schematic Diagram
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