Dear AT91 Users,
you have probably all noticed that for internal IRQ sources coming from internal peripherals and going to the AIC, there is the possibility to configure the source type as Edge Triggered detection or Level Sensitive detection.
But what is the best one to use
If we take the case that you only have one not nested interrupt at a time to manage in your application (I have a doubt... ), you can use the edge triggerred mode. But when there are severals IRQs to manage from one peripheral, by using the edge triggered way, you may lose IRQs if the first IRQ has not been treated fast enough to get another one from the same peripheral. The document attached with this topic gives you the explaination. To conclude there is no particular reason to use the edge triggered mode for internal IRQs.
Discussion about SAM7 Series and ARM7TDMI based products.
3 posts • Page 1 of 1
The AT91M55800A manual says that if you want to use interrupt clearing and setting (via AIC_ISCR and AIC_ICCR), you need an edge-triggered setup. So if anyone needs that feature...
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