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This is a sketch design with the dual purpose of 1) trying out the 123D Circuits methodology and 2) completing a rough implementation of a micro controller connected via USB to a host.
This board will feature a single SiLabs C8051F320 micro controller with the minimal complement of discrete parts needed to complete the USB link. The I/O pins on the micro controller which are not used to support the USB link will be broken out to discrete pins to make them accessible to external circuitry. Optionally some buffers or isolators may be included.