topic Re: PWM default output in Digital Signal Controllers

PWM default output

matthiasuhlmann — Fri, 13 Feb 2015 10:07:35 GMT

Hi all,

Can somebody tell me how I can configure the default PWM output if i disable output with "PWMx_OUTEN"

I configured output in case of a fault and this works correct, but if i disable output with "PWMx_OUTEN" all outputs are "0". Is there a way to set the state required?

Best Regards,

Matthias

Re: PWM default output

cabl — Tue, 17 Feb 2015 12:22:59 GMT

Maybe the PWMAFS field of the OCTRL register (page 669 in MC56F847xx Reference Manual, Rev. 1, 06/2012)

Re: PWM default output

matthiasuhlmann — Tue, 17 Feb 2015 13:37:06 GMT

HI Carlos,

PWMAFS in OCTRL is used to define the output state in fault state. I allready set up this register to define output in case of a fault detection, but if I disable the output using OUTEN the output state is not as defined in the OCTRL register...

Re: PWM default output

cabl — Tue, 17 Feb 2015 16:11:17 GMT

I don´t know. I once did something similar with PWMA_SWCOUT and PWMA_DTSRCSEL when I wanted to stop the PWM output at a desired value.

Re: PWM default output

matthiasuhlmann — Wed, 18 Feb 2015 11:28:33 GMT

This is a possible work around i think.

I just hoped for a possibility to configure default output state to use OUTEN.

Thank You!

Re: PWM default output

xiangjun_rong — Sat, 21 Feb 2015 01:10:24 GMT

Hi, Matthias,

If you clear the PWMA_EN/PWMB_EN bits in PWMA_OUTEN register, the PWM output pins will be disabled, in the case, the PWM_A and PWM_B pins will be float(in high impedance), the external pull-up or pull-down resistor will determine the pins state.

Because I am taking vacation, I can not test it, pls test it yourself.

XiangJun Rong