How do I use an input to trigger an interrupt to set a output?

I have been trying to figure this one out. 

I want to run an interrupt upon a trigger from an input, in the interrupt it will cause a pin to go high.  I want to make this function as the interrupt will be reset by another input or by a set time.  This is the code that I have found and attempted to change to work with the MSP430G2553, but I can not get it to work.  What do I need to do to get this to work ? 

Thanks!!!!

#include "msp430g2553.h"  
  
void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;     // Stop WDT  
  TA0CCTL0=CCIE;                             // CCR0 interrupt enabled
  TA0CTL = TASSEL_2+MC_1+ID_3;           // SMCLK/8, upmode
  TA0CCR0=10000;                     // 12.5 Hz   
  P1OUT &= 0x00;               // Shut down everything
  P1DIR &= 0x00;               
  P1DIR |= BIT0 + BIT6;            // P1.0 and P1.6 pins output the rest are input 
  P1REN |= BIT3;                   // Enable internal pull-up/down resistors
  P1OUT |= BIT3;                   //Select pull-up mode for P1.3
  P1IE |= BIT3;                       // P1.3 interrupt enabled
  P1IES &= ~BIT3;                     // P1.3 Hi/lo edge
  P1IFG &= ~BIT3;                  // P1.3 IFG cleared
  _BIS_SR(CPUOFF + GIE);          // Enter LPM0 w/ interrupt 
  while(1)                          //Loop forever, we work with interrupts!
  {}
} 
  
// Timer A0 interrupt service routine 
#pragma vector=TIMER0_A0_VECTOR 
__interrupt void Timer_A (void) 
{   
   P1OUT ^= BIT0;                          // Toggle P1.0 
} 
// Port 1 interrupt service routine
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{    
   P1OUT ^= BIT6;                      // Toggle P1.6
   P1IFG &= ~BIT3;                     // P1.3 IFG cleared 
}