19
Programming
Considerations
C H A P T E R 6
This chapter discusses programming consideration for the Digi Connect SP and Digi
Connect Wi-SP and the NS7520 processor it is based on.
GPIO
General Information
The NS7520 processor supports 16 general purpose I/O (GPIO) pins, some of which are
reserved for specific functions and some of which can be customized. These pins fall into
three categories:
Those labeled Reserved in the following table are dedicated to a specific use
and must not
be reprogrammed, or the unit may not operate correctly. Often,
these pins are not connected to external interfaces.
Those labeled Allocated in the following table are exposed to an external
interface and allocated to a specific use by the software but can be customized
safely with code modifications.
Those labeled Available are exposed to an external interface, not controlled
directly by the software, and can be customized.
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