6us jump ?!

hi
i have write this code :

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

void loop() {
  digitalWrite(13,HIGH);
  delayMicroseconds(200);
  digitalWrite(13,LOW);
  delayMicroseconds(4800);
}

but in my project i saw a really high noises !
after i checked it with oscilloscope i saw that the pulse width jump from 200us to 206us in some pulses ! ?!

is there any solutions ?
thank you .

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