hardware triggers

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hardware triggers

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Contributor I

I am wondering which Kinetis chip can have an digital input rising or falling edge reset and start a counter. All of this is done via hardware without bothering the processor core. The processor will use this ramp timer to make PWM signals.

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NXP TechSupport
NXP TechSupport

Hi David,

I'd like to suggest that you can choose the KL25, the timer module TPM can support to not start incrementing after it is enabled until a rising edge on the EXTRG_IN pin is detected (Fig 1).

2015-07-23_12-47-58.jpg

                                                                                      Fig 1

You can learn more detail information about this MCU through the link as below.

http://cache.freescale.com/files/32bit/doc/ref_manual/KL25P80M48SF0RM.pdf?fasp=1&WT_TYPE=Reference%2...
Have a great day,
Ping

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Note: If this post answers your question, please click the Correct Answer button. Thank you!
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NXP TechSupport
NXP TechSupport

Hi David,

I'd like to suggest that you can choose the KL25, the timer module TPM can support to not start incrementing after it is enabled until a rising edge on the EXTRG_IN pin is detected (Fig 1).

2015-07-23_12-47-58.jpg

                                                                                      Fig 1

You can learn more detail information about this MCU through the link as below.

http://cache.freescale.com/files/32bit/doc/ref_manual/KL25P80M48SF0RM.pdf?fasp=1&WT_TYPE=Reference%2...
Have a great day,
Ping

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

View solution in original post

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Contributor I

i didnt know about this chart, thank you. I didn't know i could use the comparator output to start a timer.

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