/*  EX 2.3 Light Switch       */
/*  David Miles November 2006 */

#include <system.h>

/* Set 19.6 MHz clock frequency */
#pragma CLOCK_FREQ 8000000

/* Set PIC16 configuration word */
#pragma DATA _CONFIG1, _EXTRC_CLKOUT & _WDT_OFF & _LVP_OFF

void main ( void )
{
	ansel = 0x00 ;         /* set PORTA as digital i/o        */
    trisa = 0x00 ;         /* set all of PORTA for output     */
    trisb = 0xff ;         /* set all of PORTB for input      */

    /* repeat forever */
    while (1){

		while ( portb == 0 )
		{
			/* Do nothing */
		}

		porta ^=0X01;

		while ( portb != 0x00 )
		{
			/* Do nothing */
		}
    }
}