( 2 + 4 x CHnFVAL) filter clocks. In other words, CHF is set (2 FTM input
2 filter 4 filter clocks × CHnFVAL[3:0]) clock periods after a valid
edge occurs on the channel input.
The clock for the counter in the channel input filter is the filter clock divided by 4.
CHnFVAL[3:0] = 0100
(binary value)
channel (n) input
after the synchronizer
counter
filter output **
filter clock* divided by 4
Time
* Filter clock is prescaled and controlled by FLTPS[3:0] bits.
**Filter output is delayed one FTM input clock of filter counter logic output.
Figure 41-12. Channel input filter example
The figure below shows the delay through the input filter logic considering each internal
filter element. In this example the filter prescaler is set to zero. Note that the input signal
is delayed only by the synchronizer and edge dector logic if the filter is disabled.
FTM input clock
channel (n) input
FTM counter
CHnFVAL[3:0]
filter counter
C(n)V
CHF
1
2
3
4
5
6
7
8
9
10
11
12
13
2
1
2
1
0
12
filter output
synchronizer delay
filter counter delay
filter
output
delay
edge
detector
delay
Figure 41-13. Input capture example
Chapter 41 FlexTimer Module (FTM)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
1033
Содержание KE1xF Series
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