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Msp430 Watchdog Timer Issue

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mspgeek

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Hello all, what I am trying to do is that to observe the exact time intervals for the watchdog timer in MSP430, but no matter which clock I choose I can't get the same results I calculated by hand.

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#pragma vector = PORT1_VECTOR
    __interrupt void PORT1_ISR(void){
 
        P1OUT = LED;                              
        BCSCTL3 |= LFXT1S_2;                            //Auxiliry Clock is chosen which is 12kHz
        WDTCTL = WDT_ARST_1000;                   //According to Msp430 instructions for ACLK(32 KHZ) WDT_ARST_1000(1000ms) so for 12kHz it must be 2.6 seconds
        P1IFG = 0x00;
 
    }


for example by this interrupt I expect LED to turn off 2.6 seconds just after the button is pushed but takes more than that, I tried some other examples using the submain clock it is same again I can't get theoretical results. What may cause this, or is there something else I should take into consideration, thank you?
 

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