ATXMEGA128B1 Datasheet, PDF (99/138 Pages) ATMEL Corporation – 8/16-bit Atmel XMEGA B1 Microcontroller

37.2.3 Thresholds and Hysteresis
Figure 37-21.I/O pin input threshold voltage vs. V_CC.
V_IH I/O pin read as “1”.
1.8
1.6
-40°C
25°C
85°C
1.4
1.2
1
0.8
1.6 1.8
2
2.2 2.4 2.6 2.8
3
3.2 3.4 3.6
V_CC [V]
Figure 37-22.I/O pin input threshold voltage vs. V_CC.
V_IL I/O pin read as “0”.
1.7
1.5
-40°C
25°C
85°C
1.3
1.1
0.9
0.7
0.5
1.6 1.8
2
2.2 2.4 2.6 2.8
3
3.2 3.4 3.6
V_CC [V]
XMEGA B1 [DATASHEET] 99
8330C–AVR–07/2012