
Via the SIM module and SIM_FTMOPT1 register the FTM2CH1SEL bit provides the
choice of normal FTM2_CH1 input or the XOR of FTM2_CH0, FTM2_CH1 and
FTM1_CH1 pins that will be applied to FTM2_CH1.
NOTE
If the user utilizes FTM1_CH1 to be an input to FTM2_CH1,
FTM1_CH0 can still be utilized for other functions.
X O R
FTM2_CH1
FTM2_CH0
FTM1_CH1
Ch0
Ch1
FTM2
Ch0
Ch1
FTM1
SIM_FTMOPT1[FTM2CH1SEL]
Figure 41-112. FTM Hall Sensor Configuration
41.9.3 FTM Modulation Implementation
FTM0 and FTM3 support a modulation function where the output channels when
configured as PWM or Output Compare mode modulate another timer output when the
channel signal is asserted. Any of the 8 channels of FTM0 and any of the 8 channels of
FTM3 can be configured to support this modulation function.
The SIM_FTMOPT1 register has control bits (FTMxCHySEL) that allow the user to
select normal PWM/Output Compare mode on the corresponding FTM timer channel or
modulate with FTM1_CH1. The diagram below shows the implementation for FTM0.
FTM3 has similar implementation controlled by SIM_FTMOPT1[FTM3CHySEL] on
each of its 8 channels with modulation possible via FTM2_CH1. See SIM Block Guide
for further information.
When FTM1_CH1 is used to modulate an FTM0 channel, then the user must configure
FTM1_CH1 to provide a signal that has a higher frequency than the modulated FTM0
channel output. Also it limits the use of the FTM1_CH0 function, as the FTM1_CH1 will
be programmed to provide a 50% duty PWM signal and limit the start and modulus
values for the free running counter. FTM2 has a similar restriction when FTM2_CH1 is
used for modulating an FTM3 channel.
Usage Guide
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
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NXP Semiconductors
Summary of Contents for KE1xF Series
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