37.2.1 GPIO Input Characteristics Figure 37-17. I/O Pin Input Hysteresis vs. VDD Figure 37-18. I/O Pin Input Threshold Voltage vs. VDD (T = 25°C) Figure 37-19. I/O Pin Input Threshold Voltage vs. VDD (VIH) Figure 37-20. I/O Pin Input Threshold Voltage vs. VDD (VIL)