The table below shows the delay that is added by the FTM channel input filter according
to its configuration.
Table 41-7. FTM Channel Input Filter Delay
FTM channel input filter
FLTPS[3:0] bits
Number of rising edges between the selected edge on
channel input and setting CHF bit
• channel does not have the input
filter, or
• channel input filter is disabled
(CHnFVAL[3:0] = 0)
FLTPS[3:0] = 0
• 3 rising edges of FTM input clock
FLTPS[3:0] ≠ 0
• 3 rising edges of FTM input clock, plus
• 1 rising edge of FTM filter clock
• channel has the input filter, and
• channel input filter is enabled
(CHnFVAL[3:0] ≠ 0)
FLTPS[3:0] = 0
• (4 + 4 × CHnFVAL[3:0]) rising edges of FTM input clock
FLTPS[3:0] ≠ 0
• 4 rising edges of FTM input clock, plus
• (1 + 4 × CHnFVAL[3:0]) rising edges of FTM filter clock
The following figures illustrate two examples of channel input filter.
FTM input clock
FTM counter
CnV register
CHF bit
Note:
PS[2:0] = 3'b000
channel (n) in input capture mode with capture only on rising edges
CHnFVAL[3:0] = 4'h2 (channel (n) input filter is enabled)
53
channel (n) input
54
55
56
57
58
59
60
61
62
63
64
65
(4 + 4 x CHnFVAL) = 12 rising edges of FTM input clock
64
xx
Figure 41-18. Example of Channel Input Filter when FLTPS[3:0] = 0
Chapter 41 FlexTimer Module (FTM)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
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Содержание MWCT101 S Series
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