channel (n) output
CHF bit
TOF bit
CNT
MOD = 0x0005
CnV = 0x0003
counter
overflow
channel (n)
match
counter
overflow
channel (n)
match
counter
overflow
...
0
1
2
3
4
5
0
1
2
3
4
5
0
1
...
previous value
previous value
Figure 41-17. Example of the Output Compare mode when the match sets the channel
output
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 modified and controlled by FTM.
41.5.7 Edge-Aligned PWM (EPWM) mode
The Edge-Aligned mode is selected when:
• QUADEN = 0
• DECAPEN = 0
• COMBINE = 0
• CPWMS = 0, and
• MSB = 1
The EPWM period is determined by (MOD − CNTIN + 0x0001) and the pulse width
(duty cycle) is determined by (CnV − CNTIN).
The CHF bit is set and the channel (n) interrupt is generated if CHIE = 1 at the channel
(n) match (FTM counter = CnV), that is, at the end of the pulse width.
This type of PWM signal is called edge-aligned because the leading edges of all PWM
signals are aligned with the beginning of the period, which is the same for all channels
within an FTM.
period
counter overflow
counter overflow
counter overflow
channel (n) output
channel (n) match
channel (n) match
channel (n) match
pulse
width
Figure 41-18. EPWM period and pulse width with ELSB:ELSA = 1:0
Functional description
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
1036
NXP Semiconductors
Содержание KE1xF Series
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