
Table 41-16. Clear CHF bit when DMA = 1
CHIE
How CHF Bit Can Be Cleared
0
CHF bit is cleared either when the channel DMA transfer is done or by reading CnSC while CHF is set and then
writing a 0 to CHF bit.
1
CHF bit is cleared when the channel DMA transfer is done.
41.5.26 Dual Edge Capture mode
The Dual Edge Capture mode is selected if DECAPEN = 1. This mode allows to measure
a pulse width or period of the signal on the input of channel (n) of a channel pair. The
channel (n) filter can be active in this mode when n is 0 or 2.
Filter*
Dual edge capture
mode logic
is filter
enabled?
FTM counter
* Filtering function for dual edge capture mode is only available in the channels 0 and 2
channel (n)
interrupt
channel (n+1)
interrupt
C(n+1)V[15:0]
C(n)V[15:0]
channel (n)
CHIE
FTMEN
DECAPEN
DECAP
channel (n) MSA
channel (n) ELSB:ELSA
channel (n+1) ELSB:ELSA
0
1
channel (n) input
FTM input clock
synchronizer
CLK
D
Q
filter
prescaler
CLK
D
Q
filter clock
channel (n)
CHF
channel (n+1)
CHIE
channel (n+1)
CHF
Figure 41-85. Dual Edge Capture mode block diagram
The channel (n) MSA bit defines if the Dual Edge Capture mode is one-shot or
continuous.
The channel (n) ELSB:ELSA bits select the edge that is captured by channel (n), and
channel (n+1) ELSB:ELSA bits select the edge that is captured by channel (n+1). If both
channel (n) ELSB:ELSA and channel (n+1) ELSB:ELSA bits select the same edge, then
it is the period measurement. If these bits select different edges, then it is a pulse width
measurement.
In the Dual Edge Capture mode, only channel (n) input is used and channel (n+1) input is
ignored.
Chapter 41 FlexTimer Module (FTM)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
1085
Summary of Contents for KE1xF Series
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