I want to sample a signal. Using the both external interrupts to start sampling. The timer 0 interrupt is used for the time base. If I put the reload value very high, there are only some sates more than the timer-ISR need for executing, I get false sampling results. It looks like one of the external interrupts is not executed. I gave the external interrupts a higher priority, but the result is the same. Can it be true, that a interrupt be lost? I don't think so, but I have no other idea.