34.2.1 GPIO Input Characteristics Figure 34-22. I/O Pin Input Hysteresis vs. VDD Figure 34-23. I/O Pin Input Threshold Voltage vs. VDD (T = 25°C) Figure 34-24. I/O Pin Input Threshold Voltage vs. VDD (VIH) Figure 34-25. I/O Pin Input Threshold Voltage vs. VDD (VIL)