hardware triggers

[d2014]

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.

[jeremyzhou · Accepted solution]

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).

                                                                                      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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[d2014]

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