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CCS/MSP430F6435: Unable to generate Alarm event interrupt

Part Number: MSP430F6435

Tool/software: Code Composer Studio

Hi I am trying to generate alarm event using following configuration

 RTCCTL01 |=RTCAIFG + RTCTEVIE + RTCRDYIE + RTCBCD + RTCHOLD;  // BCD mode, RTC hold, enable RTC
                                                // event interrupt
      RTCYEAR = 0x2011;                     
      RTCMON = 0x10;                       
      RTCDAY = 0x07;                          
      RTCDOW = 0x05;                         
      RTCHOUR = 0x11;                 
      RTCMIN = 0x55;                       
      RTCSEC = 0x45;                          

      RTCAHOUR = 0x91;                           // Hour = 0x11
      RTCAMIN = 0xD6;                            //
      RTCCTL1 |= (RTCTEV_0|RTCRDYIE_L|RTCAIFG_L);                      //Enable Timer event ,Alarm event ,Ready event interrupt
      RTCCTL01 &= ~(RTCHOLD);

interrupt for RTCRDYIE is working but ,alarm event interrupt is not generated & corresponding ISR is also not executed

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