Generate 1 pulse per second using MSP430

#include <msp430.h>
#include <intrinsics.h>




unsigned int timerCount = 0;

int main(void) {


	WDTCTL = WDTPW | WDTHOLD;					// Stop watchdog timer
	P2OUT &= ~(BIT4); 							//preload 1pps to '0'


	// set I/O pins directions
	P1DIR |=BIT6+BIT7;                      //set p1.x to 11000000
	P2DIR |=BIT4;	                       // Set P2.4 to output direction
    PJDIR |=BIT0+BIT1+BIT3;                // set pj.x output 0000 1011
    P2SEL |= BIT4;							//select the option of using TD0.0 in pin 2.4
    P2IES |= BIT4;                        // high -> low is selected with IES.x = 1.
    P2IFG &= ~(BIT4);                          // To prevent an immediate interrupt, clear the flag for
                                          // P1.3 before enabling the interrupt.
    P2IE |= BIT4;                          // Enable interrupts for P1.3

    // Configure XT1 (external oscillator)
    PJSEL |= BIT4+BIT5;						// port select for xt1
    UCSCTL6 &= ~(XT1OFF); 				    //xt1 is on
    UCSCTL3 = 0;                            // FLL REFERENCE CLOCK REFERENCE = XT1

    // configure TD0.0 to output of 1 pulse per second

    TD0CCR0=16000-1;                          // setting TAR count up value 16000 (12.8MHz / 8 = 1.6MHz , 1.6MHz / 100 = 16000 Hz) when 100 is passed means 1 second has passed as well
    //TD0CCR1= 								//DUTY CYCLE OF 50%
    //TD0CCTL1=CCIE + OUTMOD_7;                    //enabling interuption + RESET/SET OUTPUT MODE
    TD0CTL0 =MC_2+ID_3+TDSSEL_0+TAIE;                //defining timer d TD0.0 (P2.4)

    __enable_interrupt();


    for(;;){                      // main loop (looping forever)



    	//   EXTERNAL / INTERNAL SELECTION BY SW4

    	if ((P2IN & BIT2)==0){         //  INTERNAL MODE
    		PJOUT |=BIT3;              // sends '1' from pj.3 output to the multiplexer U4 (uses the internal 1pps)

    		//PULSE 1 : DESCRETE ON/OFF AND SWITCH ON/BAD/OFF

                     if ((P2IN & BIT0)==0 || (P1IN & BIT0)==0) {        //NORMAL SIGNAL OF 1PPS checks if descrete source is on or 1pps sw pulse 1 is on
                    	 P1OUT |= BIT6; 									//ENABLES PULSE BY THE 'AND' GATE
                    	 PJOUT |= BIT0;									//ENABLES TTL TO RS232 CONVERTER (FOR DIFF OUTPUT)
						#pragma vector = TIMER0_D0_VECTOR
                    	 __interrupt void TIMER0_D0(void){
                	   if (++timerCount > 20) {  						 // checks if the incrementation of timerCount reaches 50 (means 0.5 second has passed)
										   P2OUT ^=BIT4;               //generates 1pps out of p2.4
										   timerCount = 0;             // resets the timer count
										   }
										   P2IFG &=~(BIT4);             // clears the fl
                    	 }

                	 }
                   }
                     else {
                    	 P1OUT |= ~(BIT6); 								//DISABLES PULSE BY SENDING A '0' TO THE AND GATE
                     }

                     if ((P1IN & BIT2)==0)  {							//PULSE 1 BAD SIGNAL ???
                    	 // CODE HERE FOR BAD SIGNAL PULSE 1//
                     }

                     //PULSE 2 : DESCRETE ON/OFF AND SWITCH ON/BAD/OFF


                     if ((P2IN & BIT1)==0 || (P1IN & BIT0)==0){			//NORMAL SIGNAL OF 1PPS checks if descrete source is on or 1pps sw pulse 2 is on
                    	 P1OUT |= BIT7; 									//ENABLES PULSE BY THE 'AND' GATE
                    	 PJOUT |= BIT1;	 								//ENABLES TTL TO RS232 CONVERTER (FOR DIFF OUTPUT)
					#pragma vector = TIMER0_D0_VECTOR 				//GENERATES 1PPS EVERY 1s
                   __interrupt void TIMER0_D0 (void){
                	   if (++timerCount > 20) {   						// checks if the incrementation of timerCount reaches 100 (means 1 second has passed)
                	                  	   P2OUT ^=BIT4;               //generates 1pps out of p2.4
                	                  	   timerCount = 0;             // resets the timer count
                	                  	   }
                	                  	   P2IFG &= ~(BIT4);             // clears the fl
                     }


    	}
                     else {
                    	 P1OUT |= ~(BIT7);									//DISABLES PULSE BY SENDING A '0' TO THE AND GATE
                     }

                     if ((P1IN & BIT3)==0){								//PULSE 1 BAD SIGNAL ???
                    	 // CODE HERE FOR BAD SIGNAL PULSE 1//
                     }


                     }

    	else {																//EXTERNAL MODE
    		PJOUT |= ~(BIT3);            //sends '0' from pj.3 output to the multimplexer U4 (uses the external 1pps)
    		P1OUT |= BIT6;      			// ENABLES PULSE 1
    		P1OUT |= BIT7;				//ENABLES PULSE 2
    		PJOUT |= BIT0;				//ENABLES RS422 DIFF OUTPUT	FOR PULSE 1
    		PJOUT |= BIT1;				// ENABLES RS422 DIFF OUTPUT FOR PULSE 2
    	    	}
    	}
}


	return 0;

Thanks in advance.