Write an 8051 C program to toggle all the bits of P1 continuously.

Write an 8051 C program to toggle all the bits of P1 continuously.

Solution:
#include <reg51.h>
void main(void) {
  for ( ; ; ) {   //repeat forever
    P1=0x55;      //0x: in hex (binary)
    P1=0xAA;      
  }
}