#include <msp430.h> 
int  ticks_for_clock, count_seconds_for_clock, count_minutes_for_clock, count_hours_for_clock, current_time;
void update_time_in_the_screen_buffer(void);
int main(void)
{                                          // Rec. 32768 crystal for WDT clock source
WDTCTL = WDT_ADLY_1_9;                     // Set WDT as interrupt source 512tpsec. (32768/64)
IE1 |= WDTIE;                              // Enable WDT interrupt
__bis_SR_register(LPM0_bits + GIE);        // Enter LPM0 w/ interrupt
}
#pragma vector=WDT_VECTOR    // Next, executed every time when WDT interrupt occurred, 512 tps.
__interrupt void watchdog_timer_512_times_per_second(void)
{                                       //update current time
ticks_for_clock++;
current_time = count_hours_for_clock + count_minutes_for_clock;
if(ticks_for_clock == 512)
 {count_seconds_for_clock++;
  ticks_for_clock = 0; //}
     if(count_seconds_for_clock == 60)
     {count_minutes_for_clock++;
      count_seconds_for_clock = 0; //}
         if(count_minutes_for_clock == 60)
         {count_minutes_for_clock=0;
          count_hours_for_clock++; //}
                 if(count_hours_for_clock == 24) count_hours_for_clock=0; //}
}}}
if (current_time != (count_hours_for_clock + count_minutes_for_clock)) update_time_in_the_screen_buffer();
}
void update_time_in_the_screen_buffer(void) { }