about using external clock to control the timed sequence

Hi there,

  I just find that in LV2013, there supports timed sequence and I can set to use the external clock as the timing source. But I wonder in that case, do I still have to control the priority and CPU resource? In my application, I choose PFI1 as the source of timing and PFI1 is connecting to the an external clock of 5kHz (the frequency of the clock is fix and not changable). But in the labview code, I need 1kHz clock, is there any way to force the clock rate for the timed sequence to 1kHz even though the actual rate is 5Hz?