Re: LPC1768 EXT0 interrupt huge lag

Op Thu, 23 Jun 2011 19:50:41 +0200 schreef navman <naveen_pn@xxxxxxxxxxxxxxxxxxxxx>:
I've setup LPC1768 for external falling edge interrupt on EINT0 pin and in the interrupt handler, I just clear the interrupt flag and make a pin
(P0.0) low and immediately high again. When I check the EINT0 pin and the
output pin P0.0 on an oscilloscope, there is a huge lag, about 520ns
between the falling edge of EINT0 & the P0.0 becoming low.

The external interrupts each have a glitch filter. This could be a large portion of your "lag".

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