Disable Interrupt.

Hi Everyone,
             I am working with MPC566. I have written one function
that runs at every 10 milisec and this time is generated using PIT
interrupt timer.
Now in my main() function , I want to disable the interrupt for
another function "ADC()" (in main() only) and then re-enable, once the
execution of this function is over. It seems,the isr function is not
running at fixed time interval of 10 milisec.
Can anyone please tell me,the code that I have written to
disable/enable interrupt is correct or not?
My code is like this:

pit_isr()
{
DAC();
}

main()
{

init_pit();

/*--diable interrupt--*/

USIU.PISCR.B.PIE=0;

ADC();

USIU.PISCR.B.PS=1;
USIU.PISCR.B.PIE=1;

/*--re-enable interrupt--*/

}


-regards
Rajesh
















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