PWM Signals at 50Hz in General Posted March 11, 2015 Yes and no. analog write does use the timer/pwm function. However, 50Hz is much too low to use under default settings. Such a long period cannot be accomodated for. You better run a timer and toggle the PWM signals in an ISR. tm4c123gx micro-controllers has builtin PWM blocks, that does all the proper duty cycle and frequency division from the clock cycle without the use of the processor, all you need to do is set the right control and status registers, and I am pretty sure the PWM function in energia uses these PWM blocks to generate the signal. Thank you.