28069比较器沿触发导致epwm一直为低或者一直为高是为什么？

具体的周期寄存器的值和比较寄存器的值是多少？？
ERIC
                                                                         - ERIC

你是CBC控制吧，这是正常的，因为COMP始终触发会是PWM在周期结束后，在零点检测时发现仍然被触发，再次进入保护，你可以设置blanking window来防止这个问题

周期寄存器，90MHz主频，TBPRD为100，比较寄存器值DACVAL为600

是CBC控制，但是在图二，PWM周期结束之前，comp就已经为高电平不再触发了，为什么在PWM周期结束后，零点检测时会发现仍然被触发？还有您提到的设置blanking window能再详细一点吗？

恢复跟PWM出什么波形没关系，主要看TBCTR = 0 的时候，比较器是否还被触发。Blank window可以参考TRM的3.2.9节。
The DCAEVT1/2 and DCBEVT1/2 events can be filtered via event filtering logic to remove noise by
optionally blanking events for a certain period of time. This is useful for cases where the analog
comparator outputs may be selected to trigger DCAEVT1/2 and DCBEVT1/2 events, and the blanking
logic is used to filter out potential noise on the signal prior to tripping the PWM outputs or generating an
interrupt or ADC start-of-conversion. The event filtering can also capture the TBCTR value of the trip
event. The diagram below shows the details of the event filtering logic.
If the blanking logic is enabled, one of the digital compare events – DCAEVT1, DCAEVT2, DCBEVT1,
DCBEVT2 – is selected for filtering. The blanking window, which filters out all event occurrences on the
signal while it is active, will be aligned to either a CTR = PRD pulse or a CTR = 0 pulse (configured by the
DCFCTL[PULSESEL] bits). An offset value in TBCLK counts is programmed into the DCFOFFSET
register, which determines at what point after the CTR = PRD or CTR = 0 pulse the blanking window
starts. The duration of the blanking window, in number of TBCLK counts after the offset counter expires, is
written to the DCFWINDOW register by the application. During the blanking window, all events are
ignored. Before and after the blanking window ends, events can generate soc, sync, interrupt, and force
signals as before.
The diagram below illustrates several timing conditions for the offset and blanking window within an
ePWM period. Notice that if the blanking window crosses the CTR = 0 or CTR = PRD boundary, the next
window still starts at the same offset value after the CTR = 0 or CTR = PRD pulse.