FTM counter
0
0
0
1
1
1
1
1
2
2
2
2
2
3
3
3
3
3
4
4
4
FTM counting is up-down
TOF bit
set TOF bit
set TOF bit
period of FTM counter clock
period of counting = 2 x (MOD - CNTIN) x period of FTM counter clock
= 2 x MOD x period of FTM counter clock
CNTIN = 0x0000
MOD = 0x0004
Figure 39-9. Example of up-down counting when CNTIN = 0x0000
Note
When CNTIN is different from zero in the up-down counting, a
valid CPWM signal is generated:
• if CnV > CNTIN, or
• if CnV = 0 or if CnV[15] = 1. In this case, 0% CPWM is
generated.
The figure below shows the possible counter events when in up-down counting mode.
See
for more details.
FTM counter
0
0
1
1
1
1
2
2
2
2
3
3
3
3
4
4
4
FTM counting is up-down
period of FTM counter clock
period of counting = 2 x (MOD - CNTIN) x period of FTM counter clock
= 2 x MOD x period of FTM counter clock
CNTIN = 0x0000
MOD = 0x0004
counter event
counter event
counter event
counter event
Figure 39-10. Example of counter events in up-down counting mode when CNTIN =
0x0000
Chapter 39 FlexTimer Module (FTM)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
915
Содержание Kinetis KE1xZ256
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