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TPMx_CONF field descriptions (continued)
Field
Description
27–26
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
25–24
TRGSEL
Trigger Select
Selects the input trigger to use for starting, reloading and/or pausing the counter. The source of the trigger
(external or internal to the TPM) is configured by the TRGSRC field. This field should only be changed
when the TPM counter is disabled.
See the chip-specific TPM information for available options.
23
TRGSRC
Trigger Source
Selects between internal (channel pin input capture) or external trigger sources.
When selecting an internal trigger, the channel selected should be configured for input capture. Only a
rising edge input capture can be used to initially start the counter using the CSOT configuration; either
rising edge or falling edge input capture can be used to reload the counter using the CROT configuration;
and the state of the channel input pin is used to pause the counter using the CPOT configuration. The
channel polarity register can be used to invert the polarity of the channel input pins.
This field should only be changed when the TPM counter is disabled.
0
Trigger source selected by TRGSEL is external.
1
Trigger source selected by TRGSEL is internal (channel pin input capture).
22
TRGPOL
Trigger Polarity
Selects the polarity of the external trigger source. This field should only be changed when the TPM
counter is disabled.
0
Trigger is active high.
1
Trigger is active low.
21–20
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
19
CPOT
Counter Pause On Trigger
When enabled, the counter will pause incrementing while the trigger remains asserted (level sensitive).
This field should only be changed when the TPM counter is disabled.
18
CROT
Counter Reload On Trigger
When set, the TPM counter will reload with 0 (and initialize PWM outputs to their default value) when a
rising edge is detected on the selected trigger input.
The trigger input is ignored if the TPM counter is paused during debug mode or doze mode. This field
should only be changed when the TPM counter is disabled.
0
Counter is not reloaded due to a rising edge on the selected input trigger
1
Counter is reloaded when a rising edge is detected on the selected input trigger
17
CSOO
Counter Stop On Overflow
When set, the TPM counter will stop incrementing once the counter equals the MOD value and
incremented (this also sets the TOF). Reloading the counter with 0 due to writing to the counter register or
due to a trigger input does not cause the counter to stop incrementing. Once the counter has stopped
incrementing, the counter will not start incrementing unless it is disabled and then enabled again, or a
rising edge on the selected trigger input is detected when CSOT set.
This field should only be changed when the TPM counter is disabled.
Table continues on the next page...
Chapter 46 Timer/PWM Module (TPM)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
1157
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