int k;
void main() {
          ANSEL =0;
          ANSELH = 0;
          PORTB = 0xFF;
          TRISB = 0;

          Delay_ms(1000);
          PORTB = 0;



    PORTB = 0b01010101;
    while (1) {
    PORTB = ~PORTB;
    for (k=1; k<10000; k++){
    asm nop;

    }
    }
}