Part Number: TMS320F28386D
Hello,
I have a question regarding duty cycle limitation when using HRPWM withtout high resolution period nor high resolution deadband.
The TRM states :
In high-resolution mode, the MEP is not active for 100% of the PWM period and becomes operational:
• Three EPWMCLK cycles after the period starts when high-resolution period (TBPRDHR) control is not enabled.
• When high-resolution period (TBPRDHR) control is enabled using the HRPCTL register: – In up-count mode: three EPWMCLK cycles after the period starts until three EPWMCLK cycles before the period ends. – In up-down count mode: when counting up, three cycles after CTR = 0 until three cycles before CTR = PRD, and when counting down, three cycles after CTR = PRD until three cycles before CTR = 0.
• When using DBREDHR or DBFEDHR, DBRED or DBFED (the register corresponding to the edge with high-resolution displacement) must be greater than or equal to 7.
The last bullet is unclear, I just want to confirm that when only using edge positionning but not the high resolution period nor deadband, we will only have the first bullet limitation, i.e., the 3 cycles ?
Best regards,
Clément
