
If (ELSB:ELSA = 0:0) when the counter reaches the value in the CnV register, the CHF
bit is set and the channel (n) interrupt is generated if CHIE = 1, however the channel (n)
output is not controlled by FTM.
If (ELSB:ELSA = 1:0), then the channel (n) output is forced high at the counter overflow
when the CNTIN register value is loaded into the FTM counter, and it is forced low 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 41-19. 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 41-20. 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,
Chapter 41 FlexTimer Module (FTM)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
1037
Summary of Contents for KE1xF Series
Page 2: ...Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 2 NXP Semiconductors...
Page 138: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 138 NXP Semiconductors...
Page 360: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 360 NXP Semiconductors...
Page 490: ...Interrupts Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 490 NXP Semiconductors...
Page 562: ...Boot Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 562 NXP Semiconductors...
Page 706: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 706 NXP Semiconductors...
Page 736: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 736 NXP Semiconductors...
Page 866: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 866 NXP Semiconductors...
Page 1164: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1164 NXP Semiconductors...
Page 1178: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1178 NXP Semiconductors...
Page 1380: ...Usage Guide Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1380 NXP Semiconductors...
Page 1472: ...Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1472 NXP Semiconductors...
Page 1482: ...Kinetis KE1xF Sub Family Reference Manual Rev 4 06 2019 1482 NXP Semiconductors...