topic MKM14Z128ACHH5 PWM duty cycle read in Kinetis Microcontrollers

MKM14Z128ACHH5 PWM duty cycle read

raununmar — Mon, 06 Apr 2020 15:18:54 GMT

Hi,

I'm starting a proyect with this microcontroller.

In that proyect I need to set a PWM and read a different one duty cycle's. Is that prossible with this model?

I have found that to generate the PWM signal I have to use the TMR0 output, but there is only one Timer I/O avaible and I dont know if there is other way to measurement the duty cycle.

Thank you in advance,

Raúl.

Re: MKM14Z128ACHH5 PWM duty cycle read

nxf56274 — Tue, 07 Apr 2020 01:36:34 GMT

Hi,

I will give you a thougnt to measure the duty. Configure a gpio as a external interrupt source. The rising edge and falling edge is active. When the PWM's rising edge comes, we start the PIT. When the PWM's falling edge comes, we stop the PIT. Calculate the difference. Then the results is multiplied by the PIT's period. It is the high level duration. If you set the gpio that the rising edge only is active, you will get the PWM's period. We have the high level duration and PWM's period. Then we can calculate the duty.

Have a great day,
TIC

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Re: MKM14Z128ACHH5 PWM duty cycle read

raununmar — Tue, 07 Apr 2020 07:01:50 GMT

Thanks you so much for your reply.

How do I know which pins have an interrupt? I have found in the manual the register to configure it and it seems that not all input support that function.

How do I know which pins support it?

Thanks you in advance,

Raúl.

Re: MKM14Z128ACHH5 PWM duty cycle read

nxf56274 — Tue, 07 Apr 2020 09:37:53 GMT

Hi,

Have a great day,
TIC

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