Im using LPC1778 uC to generate a pulse of 500Hz from the timer interrupt routine. I have configured the interrupt to interrupt every 200uS. It enters the ISR on time. But what i want to know is the accuracy of the keil simulation time shown? Will it vary when actually executed on the hardware.Because the Logic analyser shows a pulse that slightly off than whats expected. How reliable is the logic analyser graph,which depends on the keil sim time shown?