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help needed on arm7 timer interrupt

duoduo duoduo
Note: This was originally posted on 15th January 2009 at http://forums.arm.com

Dear all !
     i am trying to use a timer interrupt to call a function in an ARM7 platform.i hope this timer interrupt can happen in a 320 microseconds interval.however,i found that when i make the interval less than 11 milliseconds exception happened.
     11 milliseconds is too slow for me.why this happened?can somebody help?many thanks!

additional:i made a big mistake in my description, mixing up microseconds with milliseconds. really sorry.
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    Note: This was originally posted on 16th January 2009 at http://forums.arm.com

    i debug step by step and found where exception happened:when i used 320  microseconds and  the routine came to the end of a function, i.e. the statement "return SUCCESS", it stopped there, after a while Undefined instruction exception happened.
    and when i used 11  milliseconds ,it ran well.
    why?can anybody help?
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    Note: This was originally posted on 16th January 2009 at http://forums.arm.com

    i debug step by step and found where exception happened:when i used 320  microseconds and  the routine came to the end of a function, i.e. the statement "return SUCCESS", it stopped there, after a while Undefined instruction exception happened.
    and when i used 11  milliseconds ,it ran well.
    why?can anybody help?
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