I have a problem, I have set up TIM2 and it runs at a 10mS interval for internal timing. I now want to set up TIM3 to run at a 1 Sec interval, but all I get is an extremely fast interrupt that prevents any other task from executing. My CPU is running at 96MHz. My prescaler is 48-1 and my pulse length is 2500. Can anyone help me please? Quentin