PWM like signal during LLS

[dusek_martin]

Hi,

I would like to generate square wave on some pin during sleep mode (e.g. LLS). Duty is not important, the frequency can be 1 kHz - 10 kHz.

Are there any options for MKL27? E.g. LPO, LPTMR, LPUART... ?

[nxf56274]

Hi,

In VLPW , You can use LPTMR to generate pwm. In the interrupt of lptmr, you toggle the IO‘s level. But in LLS, you can't generate the PWM. Because the pins will be latched.
Have a great day,
TIC

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[dusek_martin · Accepted solution]

This is not ideal as I will have to wake the MCU quite frequently.

I found out that it is possible to output LPO clock using SIM->SOPT1 = SIM_SOPT1_OSC32KSEL(3) | SIM_SOPT1_OSC32KOUT(1);

LPO runs even in LLS mode, so I have 1 kHz square wave everytime.