41.5.3.3 Free running counter
If (FTMEN = 0) and (MOD = 0x0000 or MOD = 0xFFFF), the FTM counter is a free
running counter. In this case, the FTM counter runs free from 0x0000 through 0xFFFF
and the TOF bit is set when the FTM counter changes from 0xFFFF to 0x0000. See the
following figure.
A counter event occurs at the same time of TOF bit set when the FTM counter changes
from 0xFFFF to 0x0000. See
for more details.
FTM counter
0x0004
0x0004
0xFFFE 0xFFFF
0x0003
0x0000 0x0001 0x0002 0x0003
0x0005 0x0006
TOF bit
...
...
...
FTMEN = 0
set TOF bit
MOD = 0x0000
counter event
Figure 41-9. Example when the FTM counter is free running
The FTM counter is also a free running counter when:
• FTMEN = 1
• QUADEN = 0
• CPWMS = 0
• CNTIN = 0x0000, and
• MOD = 0xFFFF
41.5.3.4 Counter reset
Any one of the following cases resets the FTM counter to the value in the CNTIN register
and the channels output to its initial value, except for channels in Output Compare mode.
• Any write to CNT.
•
• A channel in Input Capture mode with ICRST = 1 (
Note that reseting the counter also generates a counter event. See
for
more details.
Functional description
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
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NXP Semiconductors
Содержание KE1xF Series
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