Pauses the program for the amount of time (in microseconds) specified as parameter (there are 1 000 000 microseconds in a second). In contrast to delay() function, delayMicroseconds() will completelly block Z-Uno and prevent all functions except for RF packets capturing to operate. This function have no limitation to use in getters and setters. delayMicroseconds(us) us the number of microseconds to pause none
void setup() {
  pinMode(20, OUTPUT);          // sets the digital pin as output

void loop() {
  digitalWrite(20, HIGH);       // sets the LED on
  delayMicroseconds(500);       // waits for a second
  digitalWrite(20, LOW);        // sets the LED off
  delayMicroseconds(100);       // waits for a second