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TOF bit
...
7
8
8
7
7
7
6
6
6
5
5
5
4
4
3
3
2
2
1
0
1
...
previous value
CNT
channel (n) output
counter
overflow
channel (n) match in
down counting
channel (n) match in
up counting
channel (n) match in
down counting
counter
overflow
CHF bit
MOD = 0x0008
CnV = 0x0005
Figure 39-24. CPWM signal with ELSB:ELSA = 1:0
If (ELSB:ELSA = X:1), then the channel (n) output is forced low at the channel (n)
match (FTM counter = CnV) when counting down, and it is forced high at the channel (n)
match when counting up. See the following figure.
TOF bit
...
7
8
8
7
7
7
6
6
6
5
5
5
4
4
3
3
2
2
1
0
1
...
previous value
CNT
channel (n) output
counter
overflow
channel (n) match in
down counting
channel (n) match in
up counting
channel (n) match in
down counting
counter
overflow
CHF bit
MOD = 0x0008
CnV = 0x0005
Figure 39-25. CPWM signal with ELSB:ELSA = X:1
If (CnV = 0x0000) or CnV is a negative value, that is (CnV[15] = 1), then the channel (n)
output is a 0% duty cycle CPWM signal and CHF bit is not set even when there is the
channel (n) match.
If CnV is a positive value, that is (CnV[15] = 0), (CnV ≥ MOD), and (MOD ≠ 0x0000),
then the channel (n) output is a 100% duty cycle CPWM signal and CHF bit is not set
even when there is the channel (n) match. This implies that the usable range of periods
set by MOD is 0x0001 through 0x7FFE, 0x7FFF if you do not need to generate a 100%
duty cycle CPWM signal. This is not a significant limitation because the resulting period
is much longer than required for normal applications.
The CPWM mode must not be used when the FTM counter is a free running counter.
39.5.9 Combine mode
The Combine mode is selected when:
• QUADEN = 0
Chapter 39 FlexTimer Module (FTM)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
927
Summary of Contents for Kinetis KE1xZ256
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