#include <mc9s12dp512.h>     
void DELAY20uS(void);
void TDELAY(void);
void main(void) 
{
  DDRB = 0xFF;		
  ATD0CTL2 = 0x82;  	
  DELAY20uS();		
  ATD0CTL3 = 0x08;
  ATD0CTL4 = 0xE3;
  ATD0CTL5 = 0x82;	
  __asm CLI;		
  for(;;) {}		
}
interrupt (((0x10000-Vatd0)/2)-1) void AD_ISR(void) 
  {  
  PORTB = ATD0DR0L;	
  TDELAY();		
  ATD0CTL5 = 0x82;	
  }
void DELAY20uS(void) {
  int x = 40;
  while(x--);
  }
void TDELAY(void)  
  {
  int x = 0;
  while(--x);
  }