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Problem on EXTI interrupt

Question asked by asecen on Jul 1, 2014
Latest reply on Apr 7, 2015 by peacock.jack.003
Hi,

In my application, I have a PPS (pulse per second) signal with a period of 1 second and pulse duration of 200 ms. This external signal is connected to an EXTI line which generates an interrupt at each rising edge of this signal. The interrupt is generated at rising edges, but sometimes it is generated 200 ms after the rising edge interrupt although there is no rising edge, but a falling edge at this point. Moreover, when interrupt is generated at this point, the flag corresponding to the EXTI line in the pending register is also not set. What do you think causes the interrupt here?

 

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