Pull-up Resistor ControlEach I/O line is designed with an embedded pull-up resistor. The pull-up resistor can be enabledor disabled by writing respectively PIO_PUER (Pull-up Enable Register) and PIO_PUDR (Pull-up Disable Resistor).Writing in these registers results in setting or clearing the corresponding bit in PIO_PUSR (Pull-up Status Register).Reading a 1 in PIO_PUSR means the pull-up is disabled and reading a 0 means the pull-up is enabled.Control of the pull-up resistor is possible regardless of the configuration of the I/O line.After reset, all of the pull-ups are enabled, i.e. PIO_PUSR resets at the value 0x0.
On 2 separate Dues, I set an LED + 100k resistor to pin 25, which lit up on initialize
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