#include <HC11.h>
#include <stdio.h>

void main( void ){ /* Main function */

	 unsigned char 	var = 1; /* initialize the counter to one */
	 unsigned char	data; /* this is the variable that we will store the data from port A */
	 unsigned char  RDRF = 0x20; /* the mask of the RDRF flag */
	 char dummy; /* the dummy variable used to clear the RDRF flag */
	 
	 dummy=SCDR; /* empty the contents of the data register to clear the RDRF flag */
	 
	 while((SCSR&RDRF)==0) /* While no key has been pressed toggle pin PA4 of port A */
	 {
	    data=PORTA; /* put contents of port A into data so we can manipulate it */
	    data=data^0x10; /* toggle data using an exor operation */
	    PORTA=data; /* store data back into port A */
	 }
	 
	 dummy=SCDR; /* Empty the contents of the data register to clear the RDRF flag */

	 while((SCSR&RDRF)==0){ /* while no key has been pressed toggle pin PA4 of port A printiing "Iteration Number: var"
	 			   incrimenting var until it reaches ten then reset itself to zero. */
	 			   
	    if (var < 11){ /* if the counter is below ten print "iteration number:" and increment var
	       printf("\nIteration Number: %d", var);
	       var++;
		}
	    else /* if the counter reaches ten then reset it to one. */	   
	       var = 1;
	 }
	 
	 /*********************
	  Print "Exit" and quit
	  ********************/
	  
	 printf("\n Exit")
	 asm("SWI");
}

/***********
     EOF
 **********/