main.cpp

msp430 it s my code!please read it,thank you!

//******************************************************************************
//  MSP430F22x4 Demo - Software Port Interrupt Service on P1.3 from LPM4
//
//  Description: A hi/low transition on P1.3 will trigger P1_ISR which,
//  toggles P1.0. Normal mode is LPM4 ~ 0.1uA. LPM4 current can be measured
//  with the LED removed, all unused Px.x configured as output or inputs
//  pulled high or low, and ensure the P1.3 interrupt input does not float.
//  ACLK = n/a, MCLK = SMCLK = default DCO
//
//               MSP430F22x4
//            -----------------
//        /|\|              XIN|-
//         | |                 |
//         --|RST          XOUT|-
//     /|\   |                 |
//      --o--|P1.3         P1.0|-->LED
//     \|/
//
//  A. Dannenberg
//  Texas Instruments Inc.
//  April 2006
//  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A
//******************************************************************************
#include "msp430x22x4.h"
volatile unsigned int i=0,j=0;
void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
  P1DIR |= 0x01;                            // Set P1.0 to output direction
  P1OUT = 0x00;
  P1IE |= 0x08;                             // P1.3 interrupt enabled
  P1IES |= 0x08;                            // P1.3 Hi/lo edge
    P1IFG &= ~0x08;;                           // P1.3 IFG cleared                 // SMCLK, contmode
  
  __bis_SR_register(LPM4_bits + GIE);       // Enter LPM4 w/interrupt
}
// Timer B0 interrupt service routine
#pragma vector=TIMERB0_VECTOR
__interrupt void Timer_B (void)
{
 i=i+1;
  if(i==20 && j==0){
    P1OUT = 0x00;
  j=1;
  i=0;
TBCTL=0x0000;                           // TACCR0 interrupt unabled
  }  
   if(i==60 && j==1){
    P1OUT = 0x00;
  j=0;
  i=0;
  TBCTL=0x0000; // TACCR0 interrupt unabled
   }
  TBCCR0 = 50000;                          // Add Offset to TACCR0
}
// Port 1 interrupt service routine
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{ 
      P1OUT = 0x01;                            // P1.0 = toggle
  P1IFG &= ~0x08;                           // P1.3 IFG cleared 
  TBCCR0 = 50000;
  TBCTL = TBSSEL_2 + MC_1+TAR; 
    TBCCTL0 = CCIE;                           // TACCR0 interrupt enabled 
  __bis_SR_register(LPM0_bits + GIE);       // Enter LPM4 w/interrupt

}