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TMS320F28335: question about the ePWM configuration for three phase full bridge IGBTs drive

yqmeng
Prodigy 60 points

Hi all,

When using the ePWM module of the F28335 chip to output sinusoidal PWM wave to drive three phase full bridge IGBTs, I would like to know when can I update the value of counter-compare register CMPA and CMPB? Can I update it at any moment I want? In addition, when the TBCTR register is non-zero and is decreasing, I clear the TBCTR register to zero, will the TBCTR register downwards overflow?

thanks a lot!