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10.7.4 External interrupts
The external interrupt capability of the PORT module is available in all digital pin
muxing modes provided the PORT module is enabled.
Each pin can be individually configured for any of the following external interrupt
modes:
• Interrupt disabled, default out of reset
• Active high level sensitive interrupt
• Active low level sensitive interrupt
• Rising edge sensitive interrupt
• Falling edge sensitive interrupt
• Rising and falling edge sensitive interrupt
• Rising edge sensitive DMA request
• Falling edge sensitive DMA request
• Rising and falling edge sensitive DMA request
The interrupt status flag is set when the configured edge or level is detected on the pin or
at the output of the digital input filter, if the digital input digital filter is enabled. When
not in Stop mode, the input is first synchronized to the bus clock to detect the configured
level or edge transition.
The PORT module generates a single interrupt that asserts when the interrupt status flag
is set for any enabled interrupt for that port. The interrupt negates after the interrupt status
flags for all enabled interrupts have been cleared by writing a logic 1 to the ISF flag in
either the PORT_ISFR or PORT_PCRn registers.
The PORT module generates a single DMA request that asserts when the interrupt status
flag is set for any enabled DMA request in that port. The DMA request negates after the
DMA transfer is completed, because that clears the interrupt status flags for all enabled
DMA requests.
During Stop mode, the interrupt status flag for any enabled interrupt is asynchronously
set if the required level or edge is detected. This also generates an asynchronous wake-up
signal to exit the Low-Power mode.
10.7.5 Digital filter
The digital filter capabilities of the PORT module are available in all digital Pin Muxing
modes if the PORT module is enabled.
Chapter 10 Port Control and Interrupts (PORT)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
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