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• Switching input capture input noise canceler function
When performing noise canceler function switching by modifying NCS in port mode register 2
(PMR2), which controls the input capture input noise canceler, TMIG should first be cleared to
0. Note that if NCS is modified without first clearing TMIG, an edge will be regarded as
having been input at the pin even though no valid edge has actually been input. Input capture
input signal input edges, and the conditions for their occurrence, are summarized in table 9.15.
Table 9.15 Input Capture Input Signal Input Edges Due to Noise Canceler Function
Switching, and Conditions for Their Occurrence
Input Capture Input
Signal Input Edge
Generation of rising edge
Generation of falling edge
Conditions
When the TMIG pin is modified from 0 to 1 while TMIG is 1, then NCS
is modified from 0 to 1 before the signal is sampled five times by the
noise canceler
When the TMIG pin is modified from 1 to 0 while TMIG is 1, then NCS
is modified from 1 to 0 before the signal is sampled five times by the
noise canceler
Rev. 6.00, 08/04, page 287 of 628
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