TOF bit
CHF bit
CNT
channel (n) output
MOD = 0x0008
CnV = 0x0005
counter
overflow
channel (n)
match
counter
overflow
...
0
1
2
3
4
5
6
7
8
0
1
2
...
previous value
Figure 39-21. EPWM signal with ELSB:ELSA = 1:0
If (ELSB:ELSA = X:1), then the channel (n) output is forced low at the counter overflow
when the CNTIN register value is loaded into the FTM counter, and it is forced high at
the channel (n) match (FTM counter = CnV). See the following figure.
TOF bit
CHF bit
CNT
channel (n) output
MOD = 0x0008
CnV = 0x0005
counter
overflow
channel (n)
match
counter
overflow
...
0
1
2
3
4
5
6
7
8
0
1
2
...
previous value
Figure 39-22. EPWM signal with ELSB:ELSA = X:1
If (CnV = 0x0000), then the channel (n) output is a 0% duty cycle EPWM signal and
CHF bit is not set even when there is the channel (n) match.
If (CnV > MOD), then the channel (n) output is a 100% duty cycle EPWM signal and
CHF bit is not set. Therefore, MOD must be less than 0xFFFF in order to get a 100%
duty cycle EPWM signal.
Note
When CNTIN is different from zero the following EPWM
signals can be generated:
• 0% EPWM signal if CnV = CNTIN,
• EPWM signal between 0% and 100% if CNTIN < CnV <=
MOD,
• 100% EPWM signal when CNTIN > CnV or CnV > MOD.
Chapter 39 FlexTimer Module (FTM)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
925
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