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发表于 2011-9-26 14:30:46
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Unused I/O pins should be configured as I/O function, output direction, and left unconnected on the PC
board, to prevent a floating input and reduce power consumption. The value of the PxOUT bit is don't
care, because the pin is unconnected. Alternatively, the integrated pullup/pulldown resistor can be enabled
by setting the PxREN bit of the unused pin to prevent the floating input. See the System Resets,
Interrupts, and Operating Modes, System Control Module (SYS)) chapter for termination of unused pins. |
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