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Arduino版本arduino-1.6.7，测试型号Arduino Nano，测试工具Saleae Logic 1.1.15
测试代码：

void setup() {
  pinMode(13, OUTPUT);
}

void loop() {
  digitalWrite(13, HIGH);
  digitalWrite(13, LOW);
  digitalWrite(13, HIGH);
  digitalWrite(13, LOW);
}

测试结果：

双路测试：

尝试寄存器操作：

void setup() {
  pinMode(13, OUTPUT);
  //pinMode(11, OUTPUT);
  DDRB |= (1<<PB3);
}

void loop() {
  digitalWrite(13, HIGH);
  digitalWrite(13, LOW);
  digitalWrite(13, HIGH);
  digitalWrite(13, LOW);
  //PB3
  digitalWrite(11, HIGH);
  digitalWrite(11, LOW);
  PORTB |= (1<<PB3);
  PORTB &= ~(1<<PB3);
  PORTB |= (1<<PB3);
  PORTB &= ~(1<<PB3);
}

结果：