In Modified Combine PWM mode, the channel (n+1) ELSB:ELSA bits are not used in
the generation of the channels (n) and (n+1) output. However, if channel (n) ELSB:ELSA
= 0:0, then the channel (n) output is not controlled by FTM, and if channel (n+1)
ELSB:ELSA = 0:0, then the channel (n+1) output is not controlled by FTM.
FTM counter
channel (n) match
channel (n) output
with ELSB:ELSA = 1:0
with ELSB:ELSA = X:1
channel (n) output
channel (n+1) match
Figure 41-47. Modified Combine PWM Mode
The Modified Combine PWM mode allows the offset addition of the duty cyle, thus, in
some cases, the C(n+1)V match can happen on the next FTM counter period. For CNTIN
≥ 0, MOD > 0, and CNTIN < MOD, this situation happens when C(n)V > C(n+1)V.
FTM counter
C(n)V match
(C(n)V is fixed)
channel (n) output
with ELSB:ELSA = 1:0
C(n+1)V is updated
with its write buffer
C(n+1)V match
0% duty cycle
Figure 41-48. Modified Combine PWM Mode Examples
If more than one pair of channels are configured in Modified Combine PWM Mode, it is
possible to fix an offset for the channel (n) match edge of each pair with respect to other
pairs. This behavior is useful in the generation of lighting PWM control signals where it
is desirable that edges are not coincident with each other pair to help eliminate noise
generation. The C(n)V register value is the shift of the PWM pulse with respect to the
beginning of FTM counter period (FTM counter = CNTIN).
Functional Description
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
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NXP Semiconductors
Содержание MWCT101 S Series
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