ePWM Trip-Zone Force Question

Hi Frank,

Depends on the mode you use:

Cycle-by-Cycle (CBC): Here in next pwm cycle it will get cleared/low

One-Shot (OSHT) : Here it will not get cleared until you manually do it. 

For more info:

Cycle-by-Cycle (CBC):

When a cycle-by-cycle trip event occurs, the action specified in the TZCTL register is carried out
immediately on the EPWMxA and/or EPWMxB output. Table 19 lists the possible actions. In addition,
the cycle-by-cycle trip event flag (TZFLG[CBC]) is set and a EPWMx_TZINT interrupt is generated if it
is enabled in the TZEINT register and PIE peripheral.
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.
• One-Shot (OSHT):
When a one-shot trip event occurs, the action specified in the TZCTL register is carried out
immediately on the EPWMxA and/or EPWMxB output. Table 19 lists the possible actions. In addition,
the one-shot trip event flag (TZFLG[OST]) is set and a EPWMx_TZINT interrupt is generated if it is
enabled in the TZEINT register and PIE peripheral. The one-shot trip condition must be cleared
manually by writing to the TZCLR[OST] bit.

Regards,

Gautam

Hi Gautam,

Thank you for your reply.

I'm using One-shot force.

By  ' Carried out immediately', does it mean next clock cycle?

Thanks,

Frank

Hi Frank,

Not next clock cycle, the moment TZn receives a low signal; the pulse would go to logic high immediately (same cycle).

Regards,

Gautam