可以設成Output Mode或是Quasi-bidirectional Mode,
控制Pin Data Input/Output暫存器可以決定輸出high或是low.
設成Input Mode後要看輸入電壓,
下表從Data Sheet抄來的, 可以看到在那個區段內算是high/low.
Symbol | Parameter | Min | Typ | Max | Unit | Test Conditions | VILS | Negative-going Threshold
(Schmitt Input), nRST | -0.3 | - | 0.2 VDD | V | - | VIHS | Positive-going Threshold
(Schmitt Input), nRST | 0.7 VDD | - | VDD + 0.3 | V | - |
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