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one-shot trip for major short circuits or over current conditions。
cycle-by-cycle trip for current limiting operation。
下面是对CBC的说明
The specified condition on the pins is automatically cleared when the ePWM time-base counter reaches zero (TBCTR = 0x0000) if the trip event is no longer present. Therefore, in this mode, the trip event is cleared or reset every PWM cycle. The TZFLG[CBC] flag bit will remain set until it is manually cleared by writing to the TZCLR[CBC] bit. If the cycle-by-cycle trip event is still present when the TZFLG[CBC] bit is cleared, then it will again be immediately set.
