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CCS: how to read PWM update diagram?



Tool/software: Code Composer Studio

Dear community

I found this thread very interesting, and the answer discusses a pwm update diagram (for double-update PWM ?):

It seems that CMPC and CMPD are used to sample and start the adc conversion, then when TBCTR = 0 the value of CMPA is loaded to the pwm register and causes the PWMA wavefrom to SET as soon as CMPA = TBCTR. 

CMPD also triggers a the ADC conversion, the value of the duty CMPB is loaded in the pwm register when TBCTR = PRD, and as soon as CMPB = TBCTR the PWM waveform PWMA CLEARs.

Could you confirm if I am interpreting this diagram correctly? or give any hint to interpret this diagram?

 Thank you