MSPM0G5187: Generating a second clock out of the device

Corey Minyard

Part Number: MSPM0G5187
Other Parts Discussed in Thread: SYSCONFIG

I need a clock input to another device on my system, and instead of creating yet another clock, I was hoping I could use the MSPM0G5187 to generate a clock. The frequency, jitter, and such is not that critical, anything over 1MHz will work. It's just to one other chip, so drive isn't critical.

I'm already using the CLK_OUT pin for another clock, so I can't use that.

Looking at the chip, I think I can use a countdown timer that automatically reloads to trigger an event. It looks like, with a 32MHz clock to the timer, I can trigger the event at 16MHz. Maybe 32MHz.

Then that event can toggle a GPIO pin, so I can get an 8MHz (maybe 16MHz?) clock out of the GPIO pin.

Does all this look correct?

Thanks,

-corey

4 months ago

0 Owen Li 4 months ago

TI__Expert 8731 points

Hi Corey,

I would suggest using a PWM instance to generate the clock signal.

Best,

Owen

0 Corey Minyard 4 months ago in reply to Owen Li

Prodigy 240 points

Thanks Owen.

I did look at using a PWM pin, which obviously makes sense, but I couldn't figure out how to make it work. I set up a PWM timer in sysconfig, and set it to Channel 0, and I can see the "Capture/Compare Pin" in the pinmux, but I couldn't figure out how to set the PWM output pin. How do I set it up?

-corey