delayMicroseconds
void delayMicroseconds(unsigned int time);
This function delays the program the slecified number of microseconds. It works accuratley for times of 4us to about 16,000us. If you want to delay for longer than a few thousand microseconds, use delay() instead.
Usage:
//alternate pin 1 HIGH and LOW very fast
//Imagine there's an LED linked to it, and it's blinking every second.
digitalWrite(1, HIGH);
delayMicroseconds(100);
digitalWrite(1, LOW);
delayMicroseconds(100);