mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 849

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

If (ELSnB:ELSnA = 1:0), then the channel (n) output is forced high at the counter
overflow (when the CNTINH:L register contents are loaded into the FTM counter), and it
is forced low at the channel (n) match (when the FTM counter = CnVH:L) (see the
following figure).
If (ELSnB:ELSnA = X:1), then the channel (n) output is forced low at the counter
overflow (when the CNTINH:L register contents are loaded into the FTM counter), and it
is forced high at the channel (n) match (when the FTM counter = CnVH:L) (see the
following figure).
If (CnVH:L = 0x0000), then the channel (n) output is a 0% duty cycle EPWM signal and
CHnF bit is not set even when there is the channel (n) match. If (CnVH:L > MODH:L),
then the channel (n) output is a 100% duty cycle EPWM signal and CHnF bit is not set
even when there is the channel (n) match. Therefore, MODH:MODL must be less than
0xFFFF in order to get a 100% duty cycle EPWM signal.
Freescale Semiconductor, Inc.
MODH:L = 0x0008
CnVH:L = 0x0005
• EPWM mode is only available with (CNTINH:L =
• EPWM mode with (CNTINH:CNTINL ≠ 0x0000) is not
MODH:L = 0x0008
CnVH:L = 0x0005
0x0000).
recommended and its results are not guaranteed.
Figure 37-158. EPWM Signal with ELSnB:ELSnA = X:1
Figure 37-157. EPWM Signal with ELSnB:ELSnA = 1:0
channel (n) output
channel (n) output
CHnF bit
TOF bit
MCF51JF128 Reference Manual, Rev. 2, 03/2011
CHnF bit
CNTH:L
CNTH:L
TOF bit
overflow
overflow
counter
counter
...
...
0
0
previous value
previous value
1
1
Preliminary
2
2
Note
3
3
channel (n)
channel (n)
4
4
match
match
5
5
6
6
7
7
overflow
overflow
counter
counter
8
8
0
0
1
1
Chapter 37 FlexTimer (FTM)
2
2
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