39.5.3.5 Counter events
Counter events can be used as reload opportunities to FTM register sychronization
mechanism. See
for more details. There are some possible counter events
depending on the counter mode. Please see the table below for more details.
Table 39-4. FTM counter events
When
Then
FTM counter is in up counting mode or freerunning
• A counter event happens at the same time of TOF bit
set when the FTM counter changes from MOD to
CNTIN (counter wrap). Figure at
counter event generation.
• When in freerunning, there is a counter event when
FTM counter changes from 0xFFFF to 0x0000. Figure
at
generation.
FTM counter is in up-down counting mode
• In up-down counting mode, there are two possible
counter events when FTM counter turns from down to
up counting and when counter turns from up to down
counting. User can select which point will be used to
generate the counter event. Figure at
shows the possible counter events.
FTM counter is reseted (see
different from zero is written at CLKS field
• In up-counting mode, all counter reset events or a write
in the CLKS with a value different from zero generates
a counter event.
• In up-down counting mode, counter reset events only
generates a counter event if the minimum load point
when FTM counter turns from down to up counting is
configured. A write in the CLKS with a value different
from zero always generates a counter event in up-down
counting mode.
39.5.4 Channel Modes
The following table shows the channel modes selection.
Table 39-5. Channel Modes Selection
DECAPEN
COMBINE
CPWMS
MSB:MSA
ELSB:ELSA
Mode
Configuration
X
X
X
XX
00
Pin not used for FTM—revert the
channel pin to general purpose I/O
or other peripheral control
0
0
0
00
01
Input Capture
Capture on
Rising Edge
Only
10
Capture on
Falling Edge
Only
Table continues on the next page...
Chapter 39 FlexTimer Module (FTM)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
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