430F6723的RTC不能使用内部时钟REFOCLK吗？

参考用户指南 21.1 RTC Overview

https://www.ti.com.cn/cn/lit/ug/slau208q/slau208q.pdf

而

综上，可以使用的·

int main(void)//
{
    WDTCTL = WDTPW | WDTHOLD;               // Stop WTD

    // Initialize LFXT1
//    UCSCTL6 &= ~(XT1OFF);                   // Enable XT1
//    UCSCTL6 |= XCAP_3;                      // Internal load cap
//
//    // Loop until XT1, XT2 & DCO fault flag is cleared
//    do
//    {
//        UCSCTL7 &= ~(XT2OFFG | XT1LFOFFG | DCOFFG);
//        // Clear XT2,XT1,DCO fault flags
//        SFRIFG1 &= ~OFIFG;                  // Clear fault flags
//    } while (SFRIFG1 & OFIFG);              // Test oscillator fault flag
    
    UCSCTL4 = SELM__REFOCLK + SELS__REFOCLK + SELA__REFOCLK; 
    UCSCTL3 |= SELREF__REFOCLK;
//    _bis_SR_register(SCG0);                    // 禁止FLL功能
//    UCSCTL0 = 0x0000 ;
//    UCSCTL1 = DCORSEL_5;                      // DCO频率为（2.5~6MHz）手册37页
//    UCSCTL2 = FLLD_1 + 127;                   // 设置DCO频率为4194304hz
//    __bic_SR_register(SCG0);                    // 使能FLL功能
    
    P1OUT &= ~BIT0;                         // Clear P1.0 output
    P1DIR |= BIT0;                          // Set P1.0 as output
    P1OUT &= ~BIT1;                         // Clear P1.0 output
    P1DIR |= BIT1;                          // Set P1.0 as output

    // Configure RTC_C
    RTCCTL0_H = RTCKEY_H;                   // Unlock RTC_C module
    RTCCTL0_L |= RTCTEVIE | RTCMODE|RTCAIE | RTCRDYIE; // Enable RTC time event, alarm event,
                                            // read ready interrupt
    RTCCTL1 |= RTCBCD | RTCHOLD;            // RTC enable BCD mode, RTC hold

    RTCYEAR = 0x2011;                       // Year = 0x2011 = 2011
    RTCMON = 0x12;                          // Month = 0x12 = December
    RTCDAY = 0x05;                          // Day = 0x05 = 5th
    RTCDOW = 0x03;                          // Day of week = 0x03 = Wednesday
    RTCHOUR = 0x24;                         // Hour = 0x12
    RTCMIN = 0x59;                          // Minute = 0x57
    RTCSEC = 0x55;                          // Seconds = 0x36

    RTCADOWDAY = 0x3;                       // RTC Day of week alarm = 0x2
    RTCADAY = 0x22;                         // RTC Day Alarm = 0x22
    RTCAHOUR = 0x23;                        // RTC Hour Alarm
    RTCAMIN = 0x45;                         // RTC Minute Alarm

    RTCCTL1 &= ~(RTCHOLD);                  // Start RTC calendar mode
    RTCCTL0_H = 0;                          // Lock RTC_C module

    __bis_SR_register(GIE);     // Enter LPM3 w/ interrupts enabled
    while(1)
    {
       P1OUT ^= BIT1;  
       __delay_cycles(0x3600);
    }
    //__no_operation();
}

// RTC Interrupt Service Routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=RTC_VECTOR
__interrupt void rtc_isr(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(RTC_VECTOR))) rtc_isr (void)
#else
#error Compiler not supported!
#endif
{
    switch (__even_in_range(RTCIV, 16))
    {
        case RTCIV_NONE:                    // No interrupts
            break;
        case RTCIV_RTCOFIFG:                // RTCOFIFG
            break;
        case RTCIV_RTCRDYIFG:               // RTCRDYIFG
            P1OUT ^= 0x01;                  // Toggles P1.0 every second
            break;
        case RTCIV_RTCTEVIFG:               // RTCEVIFG
            __no_operation();               // Interrupts every minute
            break;
        case RTCIV_RTCAIFG:                 // RTCAIFG
            __no_operation();               // Interrupts every alarm event
            break;
        case RTCIV_RT0PSIFG:                // RT0PSIFG
            break;
        case RTCIV_RT1PSIFG:                // RT1PSIFG
            break;
        case 14: break;                     // Reserved
        case 16: break;                     // Reserved
        default: break;
    }
}

你使用的是RTC的计数器模式，而不是日历的模式。你在日历模式试一下，我这边是很久才会进入一次中断，谢谢

user791567 说：

我这边是很久才会进入一次中断

能否详细描述一下？

我这边用下面的代码测试了一下，运行正常，P1.0每秒闪烁一下，而后会进入RTCEVIFG

#include <msp430.h>

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop Watchdog Timer
  P1DIR |= BIT0;                            // Set P1.0 as output

  UCSCTL4 = SELM__REFOCLK + SELS__REFOCLK + SELA__REFOCLK;       // MCLK = SMCLK = ACLK = REFOCLK

  // Configure RTC_A
  RTCCTL01 |= RTCTEVIE + RTCRDYIE + RTCBCD + RTCHOLD + RTCMODE;
                                            // RTC enable, BCD mode, RTC hold
                                            // enable RTC read ready interrupt
                                            // enable RTC time event interrupt

  RTCYEAR = 0x2010;                         // Year = 0x2010
  RTCMON = 0x4;                             // Month = 0x04 = April
  RTCDAY = 0x05;                            // Day = 0x05 = 5th
  RTCDOW = 0x01;                            // Day of week = 0x01 = Monday
  RTCHOUR = 0x10;                           // Hour = 0x10
  RTCMIN = 0x32;                            // Minute = 0x32
  RTCSEC = 0x45;                            // Seconds = 0x45

  RTCADOWDAY = 0x2;                         // RTC Day of week alarm = 0x2
  RTCADAY = 0x20;                           // RTC Day Alarm = 0x20
  RTCAHOUR = 0x10;                          // RTC Hour Alarm
  RTCAMIN = 0x23;                           // RTC Minute Alarm

  RTCCTL01 &= ~(RTCHOLD);                   // Start RTC calendar mode

  __bis_SR_register(LPM3_bits + GIE);       // Enter LPM3 mode with interrupts
                                            // enabled
  __no_operation();
}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=RTC_VECTOR
__interrupt void RTC_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(RTC_VECTOR))) RTC_ISR (void)
#else
#error Compiler not supported!
#endif
{
  switch(__even_in_range(RTCIV,16))
  {
    case RTC_NONE:                          // No interrupts
      break;
    case RTC_RTCRDYIFG:                     // RTCRDYIFG
      P1OUT ^= 0x01;                        // Toggles P1.0 every second
      break;
    case RTC_RTCTEVIFG:                     // RTCEVIFG
      __no_operation();                     // Interrupts every minute
      break;
    case RTC_RTCAIFG:                       // RTCAIFG
      break;
    case RTC_RT0PSIFG:                      // RT0PSIFG
      break;
    case RTC_RT1PSIFG:                      // RT1PSIFG
      break;
    case 12: break;                         // Reserved
    case 14: break;                         // Reserved
    case 16: break;                         // Reserved
    default: break;
  }
}

user791567 说：

我焊接XT1的晶振（32.768KHZ）的话也是会进入中断，如果去掉晶振RTC的中断就不进入了。使用的是MSP430F6723，使用上面的程序

 如之前所说，RTC_C的话，需要连接外部晶振XT1