• 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.
34.7.4 Digital filter
The digital filter capabilities of the PORT module are available in all digital Pin Muxing
modes if the PORT module is enabled.
The clock used for all digital filters within one port can be configured between the bus
clock or the LPO clock. This selection must be changed only when all digital filters for
that port are disabled. If the digital filters for a port are configured to use the bus clock,
then the digital filters are bypassed for the duration of Stop mode. While the digital filters
are bypassed, the output of each digital filter always equals the input pin, but the internal
state of the digital filters remains static and does not update due to any change on the
input pin.
The filter width in clock size is the same for all enabled digital filters within one port and
must be changed only when all digital filters for that port are disabled.
The output of each digital filter is logic zero after system reset and whenever a digital
filter is disabled. After a digital filter is enabled, the input is synchronized to the filter
clock, either the bus clock or the LPO clock. If the synchronized input and the output of
Functional description
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
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NXP Semiconductors
Summary of Contents for Kinetis KE1xZ256
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