39.5.16 Output mask
The output mask can be used to force channels output to their inactive state through
software. For example: to control a BLDC motor.
Any write to the OUTMASK register updates its write buffer. The OUTMASK register is
updated with its buffer value by PWM synchronization; see
.
If CH(n)OM = 1, then the channel (n) output is forced to its inactive state (POLn bit
value). If CH(n)OM = 0, then the channel (n) output is unaffected by the output mask.
See the following figure.
FTM counter
channel (n) output
(before output mask)
channel (n) output
(after output mask)
the beginning of new PWM cycles
configured PWM signal starts
to be available in the channel (n) output
channel (n) output is disabled
CH(n)OM bit
Figure 39-72. Output mask with POLn = 0
The following table shows the output mask result before the polarity control.
Table 39-12. Output mask result for channel (n) before the polarity control
CH(n)OM
Output Mask Input
Output Mask Result
0
inactive state
inactive state
active state
active state
1
inactive state
inactive state
active state
Functional description
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
960
NXP Semiconductors
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