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XOR Gate

A digital logic gate that outputs HIGH when its inputs are different (one HIGH, one LOW).

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XOR Gate

A digital logic gate that implements logical Exclusive-OR. It acts as an inequality detector, producing a HIGH output only when the inputs are different from each other.

Logic ComponentsDigital Logic

Overview

The XOR (Exclusive-OR) gate is a fundamental component used in arithmetic circuits (like adders and subtractors) and error-checking logic. It evaluates if two logic states are unequal.

Pin Reference

Pin	Type	Description
IN1	input	First digital logic input. Expects HIGH (1) or LOW (0).
IN2	input	Second digital logic input. Expects HIGH (1) or LOW (0).
OUT	digital	Digital logic output. Driven HIGH when IN1 is not equal to IN2.

Configurable Attributes

This component currently has no configurable attributes.

Working Principle

Truth Table

IN1	IN2	OUT
0 (LOW)	0 (LOW)	0 (LOW)
0 (LOW)	1 (HIGH)	1 (HIGH)
1 (HIGH)	0 (LOW)	1 (HIGH)
1 (HIGH)	1 (HIGH)	0 (LOW)

The XOR function models Boolean addition without carry.

Wiring Diagram

Example of a logic XOR gate wired to an Arduino Uno and an LED (with a resistor).

Example Arduino Code

const int pinIn1 = 2; // Connect to IN1
const int pinIn2 = 3; // Connect to IN2
const int pinOut = 4; // Connect to OUT

void setup() {
  Serial.begin(9600);
  pinMode(pinIn1, OUTPUT);
  pinMode(pinIn2, OUTPUT);
  pinMode(pinOut, INPUT);
  Serial.println("XOR Gate Truth Table Test:");
}

void loop() {
  for (int state = 0; state < 4; state++) {
    bool val1 = (state & 1);
    bool val2 = (state & 2) >> 1;

    digitalWrite(pinIn1, val1 ? HIGH : LOW);
    digitalWrite(pinIn2, val2 ? HIGH : LOW);
    delay(10);
    
    int result = digitalRead(pinOut);
    
    Serial.print("IN1: ");
    Serial.print(val1);
    Serial.print(" | IN2: ");
    Serial.print(val2);
    Serial.print(" => OUT: ");
    Serial.println(result);
    delay(1000);
  }
}

Simulation Notes

• Evaluates logic instantaneously.
• Floating inputs may cause undefined behavior. Tie unused inputs to Ground.

Notes / Warnings

• Voltage Levels: The simulator treats standard logic signals as valid inputs. Do not apply analog voltages.

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