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sparkfun NEO-M9N - Broken Out Pins and UART; UART Communication Pins; Special Function Pins

sparkfun NEO-M9N
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UART
There are two pins on the right most header labeled for their UART functionality.
Broken Out Pins
There are four other pins broken out: Pulse per second ( PPS ), Reset ( RST ), Safeboot ( SAFE ), and finally the
interrupt pin ( INT ). The first pin PPS , outputs pulse trains synchronized with the GPS or UTC time grid. The signal
defaults to once per second but is configurable over a wide range. Read the u-blox Receiver Protocol
Specification in the Resources and Going Further tab for more information. The reset pin resets the chip. The
next pin, SAFE is used to start up the IC in safe boot mode, this could be useful if you somehow manage to corrupt
the module's Flash memory. The final pin INT can be used to wake the chip from power save mode.