![]() In digital electronics three-state, tri-state, or 3-state logic allows an output or input pin/pad to assume a high impedance state, effectively removing the output from the circuit, in addition to the 0 and 1 logic levels. If voltage difference exceeds approximately 2 V.įor information on how to configure these pins as normal GPIOs, see NFCT - Near field communication tag and UICR - User information configuration registers. ![]() This allows multiple circuits to share the same output line or lines (such as a bus which cannot listen to more than one device at a time). Will not be protected against strong NFC field damage if the pins are configured as GPIO andĪn NFC antenna is connected to the device. The pins will always be configured as NFC pinsĭuring power-on reset until the configuration is set according to the UICR register. These two pins will have some limitations when configured as GPIO. Higher on these pins, and there is some current leakage between the two pins if they areĭriven to different logical values.
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