An object of the present invention is to provide a microcontroller development system (MDS System) comprising an MDS main body that does not require an EVA chip and a port regeneration circuit with a minimum number of pins. The MDS system includes an EVA chip and an MDS main body, and includes a plurality of control signals EVA pins for controlling communication between the EVA chip and the MDS main body for each control signal, and share address and data except for the control signal. And an address / data EVA pin for communicating over the bus. As a result, when developing an MDS system using an EVA chip, the chip size can be reduced by minimizing a separate EVA pin. In addition, the effect of simplifying the configuration of a separate MDS has also been obtained.
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