Pin Threshold and Hysteresis

Figure 1. ATmega48PB/88PB: I/O Pin Input Threshold Voltage vs. VCC (VIH, I/O Pin read as ‘1’)
Figure 2. ATmega48PB/88PB: I/O Pin Input Threshold Voltage vs. VCC (VIL, I/O Pin read as ‘0’)
Figure 3. ATmega48PB/88PB: I/O Pin Input Hysteresis vs. VCC
Figure 4. ATmega48PB/88PB: Reset Input Threshold Voltage vs. VCC (VIH, I/O Pin read as ‘1’)
Figure 5. ATmega48PB/88PB: Reset Input Threshold Voltage vs. VCC (VIL, I/O Pin read as ‘0’)
Figure 6. ATmega48PB/88PB: Reset Pin Input Hysteresis vs. VCC