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LPC55S69 : GINTx interrupts , identify exact pin

Question asked by Eugene Hiihtaja on Jan 27, 2020
Latest reply on Feb 4, 2020 by soledad

Hi !

 

Do I undestand right and it is not possible to identify what exact pin cause GINT interrupt ?

 

I have more than 15 pins what is spread between GINT0 and 1 controllers. Sometimes MCU stay in PowerDown mode.

 

Wakup from PowerDown mode can take even 550us if whole SRAM is set to be retained.

 

If during wakeup time GPIO pin returned back e.g make positive or negative pulse what is shorter than wakeup time, it is not possible to detect what pin are cause interrupt by reading GPIO state in interrupt handler.

Pin state is the same what is before interrupt and non of regiters are not indicate this pin.

 

So MCU is wakeup and when GINTx interrupt handler is executed, I can't detect that pin what cause wakeup.

Is this so ?

 

Regards,

Eugene

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