34.2.3 GPIO Pull-Up Characteristics Figure 34-34. I/O Pin Pull-Up Resistor Current vs. Input Voltage (VDD = 1.8V) Figure 34-35. I/O Pin Pull-Up Resistor Current vs. Input Voltage (VDD = 3.0V) Figure 34-36. I/O Pin Pull-Up Resistor Current vs. Input Voltage (VDD = 5.0V)