topic Re: hardware triggers in Kinetis Microcontrollers

hardware triggers

d2014 — Wed, 22 Jul 2015 23:11:07 GMT

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.

Re: hardware triggers

jeremyzhou — Thu, 23 Jul 2015 04:50:11 GMT

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%20Manuals&WT_VENDOR=F…
Have a great day,
Ping

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Re: hardware triggers

d2014 — Thu, 23 Jul 2015 15:56:30 GMT

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