//Displaying Overflow Timer on LEDs of PORTB in C Language for Dragon12+ Trainer with Codewarrior
//Modified from Example 9-28 in HCS12 book by Mazidi & Causey
 
#include <hidef.h>      /* common defines and macros */
#include "derivative.h"      /* derivative-specific definitions */


void main(void) 
{
  /* put your own code here */
  
    unsigned char overflow = 0; 

    DDRB = 0xFF;    //PORTB as output
    DDRJ = 0xFF;    //PTJ as output for Dragon12+ LEDs
    PTJ=0x0;        //Allow the LEDs to dsiplay data on PORTB pins
   	
   TSCR1 = 0x80;  //enable timer
   TSCR2 = 0x04;  //Prescaler=16 (Try 0-7 values to see changes on LEDs) 
  	   
   for(;;)
    { 
      TFLG2 = 0x80;  
      
      while (!(TFLG2 & TFLG2_TOF_MASK));  //wait for Timer Overflow
      overflow = overflow + 1;            //keep adding the overflows
      PORTB = overflow;                   //and dump it PORTB to see
    }

}