MSP430FR2476: 定时器使用问题

我这里没有问题，附上我的代码：

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//******************************************************************************
//  MSP430FR267x Demo - Timer0_B7, PWM TB0.1-2, Up/Down Mode, 32kHz ACLK.
//                      Showcase double-buffered TBxCCRn feature.
//
//  Description: This program generates two PWM outputs on P4.7, P5.0 using
//  Timer_B configured for up/down mode. Timer_B TBxCCRn registers are
//  double-buffered and can be grouped. In this program, TB0CCR1 and TB0CCR2
//  are grouped and loaded to shadow registers(TB0CL1&TB0CL2) simultaneously.
//  Normal operating mode is LPM3.
//  ACLK = TBCLK = REFO = 32768Hz, MCLK = 1MHz(default)
//                MSP430FR2676
//         ---------------
//     /|\|               |
//      | |               |
//      --|RST            |
//        |     P4.7/TB0.1|-->
//        |               |
//        |     P5.0/TB0.2|-->
//
//**********************************************************
//
//  MSP430FR267x Demo - Timer0_A3, Toggle P1.0, CCR0 Count Mode ISR, DCO SMCLK
//
//  Description: Toggle P1.0 using software and TA_0 ISR. Timer0_A is
//  configured for continuous mode, thus the timer overflows when TAR counts
//  to CCR0. In this example, CCR0 is loaded with 50000.
//  ACLK = n/a, MCLK = SMCLK = TACLK = default DCO = ~1MHz
//
//                MSP430FR2676
//             -----------------
//         /|\|                 |
//          | |                 |
//          --|RST              |
//            |                 |
//            |             P1.0|--> LED
//
//**********************************************************
//combined above two demos
//**********************************************************
//
//   Longyu Fang
//   Texas Instruments Inc.
//   August 2018
//   Built with IAR Embedded Workbench v7.12.1 & Code Composer Studio v8.1.0
//******************************************************************************
#include <msp430.h>

int main(void)
{
    WDTCTL = WDTPW | WDTHOLD;                  // Stop WDT
    P4DIR |= BIT7;                      // P4.7 output
    P4SEL1 |= BIT7;                     // P4.7 options select, TB0.1
    P5DIR |= BIT0;                      // P5.0 output
    P5SEL1 |= BIT0;                     // P5.0 options select, TB0.2

    P1DIR |= BIT0;                                // P1.0 output
    P1OUT |= BIT0;                                // P1.0 high

    // Disable the GPIO power-on default high-impedance mode to activate
    // previously configured port settings
    PM5CTL0 &= ~LOCKLPM5;

    TB0CCR0 = 128;                             // PWM Period/2
    TB0CCTL1 = OUTMOD_2 |CLLD_2;               // TBCCR1 toggle/reset; CLLD=2
    TB0CCR1 = 32;                              // TBCCR1 PWM duty cycle
    TB0CCTL2 = OUTMOD_6 | CLLD_2;              // TBCCR2 toggle/set; CLLD=2
    TB0CCR2 = 64;                              // TBCCR2 PWM duty cycle


    TA0CCTL0 |= CCIE;                             // TACCR0 interrupt enabled
    TA0CCR0 = 50000;

    TB0CTL = TBSSEL__ACLK | MC_3 | TBCLGRP_1;  // ACLK, up-down mode, TBxCL1+TBxCL2 group
    TA0CTL |= TASSEL__SMCLK | MC__CONTINUOUS;     // SMCLK, continuous mode


    __bis_SR_register(LPM0_bits | GIE);           // Enter LPM0 w/ interrupts
    __no_operation();                             // For debug

}

// Timer A0 interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = TIMER0_A0_VECTOR
__interrupt void Timer_A (void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMER0_A0_VECTOR))) Timer_A (void)
#else
#error Compiler not supported!
#endif
{
    P1OUT ^= BIT0;
    TA0CCR0 = 50000;                             // Add Offset to TACCR0
}