PIC16F887 toggling an output relay

In the previous post, we have discussed about using the digital input/Output of PORTA. Now let move to a typical example of turn on a relay on and off. This job is easily done by inverting the output bit of PORTA register.

Schematic Diagram

Each time the switch connects to RA0 is pressed, the CPU toggle the output relay.

#define RLY PORTA.F1
#define SW PORTA.F0
 
void main() {
      PORTA=0x00;  // CLEAR PORTA
      TRISA=0x01;  // RA0 IS INPUT
      ANSEL=0x00;  // Disable all analog function
      while(1)
      {
       if(SW==0)
       {
         while(SW==0) ;    // wait for switch release
          RLY=RLY^1;       // toggle relay on/off
       }
      }
}