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TMS320F28034: The edge control in HR EPWM

Part Number: TMS320F28034


Hi Experts,

The pulse output has made at "Zero PRD" event or "CMPA" event by using Up-Down mode.
After the PWM output wave was observed, it seems that the output wave with "Zero PRD" has a jitter.

Settings except action events are as follows:
- Synchronous signal is OFF
    EPWM1 is master, EPWM2 and EPWM3 are slaves. The synchronized at the first only.
-Both edges are HR controlled. (HRCNFG register EDGMODE = 3)
-Auto conversion activated. ( HRCFG register AUTOCONV = 1)
-PRD High resolution enabled. (HRCTL register HRPE = 1 )

High resolution (freq) is utilized, however, doesn't PRD act non-high resolution because PRD is in 3 SYSCLK non-operational period?
Is it recommended to control edges by CMPA during TB up and down?

I would like to share the wave form locally.
Thank you and best regards,
Hitoshi