2.2.5. Programmable Pull-Up Resistor
The programmable pull-up resistor feature is enabled by default on unused I/O for both 1.2 V and 1.5 V VCCIO_PIO. The pull-up resistor weakly holds the I/O to the VCCIO_PIO level.
If you enable the weak pull-up resistor, you cannot use the bus-hold feature.
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