I've got a simple control loop and I need to track the elapsed time of each loop. Duration will be anything from 2u-sec to 500 u-sec. I'm wondering if there's a system clock tic register or countdown timer I can read each time around the loop to calculate the elapsed time. I'm sure I could setup a dedicated timer and reset it each time through but thought there might be an easier way reading some SysClock register. Any thoughts on this?