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P2020 external IRQ0 can't be triggered

Question asked by Jia Guo on Apr 30, 2020



I've set external IRQ0 to falling edge trigger and pulled this pin low, but it seem this interrupt doesn't be triggered, the corresponding interrupt service routine doesn't be called. The EIVPR0 and EIDR0 register values are:
PIC_EIVPR0 - 0x000c0001, PIC_EIDR0 - 0x00000001
Are there any other settings should be taken if I want to trigger external IRQ? (I've checked that EXT_IRQ0 isn't multiplexed with the other Pins)