Information

The CHnF bit is set and the channel (n) interrupt is generated (if CHnIE = 1) at the
channel (n) match (FTM counter = C(n)V). The CH(n+1)F bit is set and the channel (n
+1) interrupt is generated, if CH(n+1)IE = 1, at the channel (n+1) match (FTM counter =
C(n+1)V).
If (ELSnB:ELSnA = 1:0), then the channel (n) output is forced low at the beginning of
the period (FTM counter = CNTIN) and at the channel (n+1) match (FTM counter = C(n
+1)V). It is forced high at the channel (n) match (FTM counter = C(n)V). See the
following figure.
If (ELSnB:ELSnA = X:1), then the channel (n) output is forced high at the beginning of
the period (FTM counter = CNTIN) and at the channel (n+1) match (FTM counter = C(n
+1)V). It is forced low at the channel (n) match (FTM counter = C(n)V). See the
following figure.
In Combine mode, the ELS(n+1)B and ELS(n+1)A bits are not used in the generation of
the channels (n) and (n+1) output. However, if (ELSnB:ELSnA = 0:0) then the channel
(n) output is not controlled by FTM, and if (ELS(n+1)B:ELS(n+1)A = 0:0) then the
channel (n+1) output is not controlled by FTM.
FTM counter
channel (n) match
channel (n+1) match
channel (n) output
with ELSnB:ELSnA = X:1
with ELSnB:ELSnA = 1:0
channel (n) output
Figure 35-146. Combine mode
The following figures illustrate the PWM signals generation using Combine mode.
Chapter 35 FlexTimer Module (FTM)
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 755