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
the digital filter remain different for a number of filter clock cycles equal to the filter
width register configuration, then the output of the digital filter updates to equal the
synchronized filter input.
The maximum latency through a digital filter equals three filter clock cycles plus the
filter width configuration register.
Chapter 11 Port Control and Interrupts (PORT)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 257
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