Action Qualifier

EPWMA and EPWMB:  Determines which events are translated into specific actions that produce the required waveforms at EPWMA and EPWMB. Actions are generated based on the following events:

Z: counter = 0
CMPA Up: counter = CA during up count
CMPA Down: counter = CA during down count
CMPB Up: counter = CB during up count
CMPB Down: counter = CB during down count
P: counter = period

You can choose the following actions for any of the events:

X = Do nothing
0 = Force output to 0
1 = Force output to 1
T = Toggle output

Deadband

Delay Mode: Indicates the deadband mode.

Falling Edge Delay Count: Indicates an independent value for falling edge delay.

Input Select: There are two inputs to the Deadband unit: PWMA and PWMB. These two inputs are DbA and DbB. They can be driven by any combination of PWMA and PWMB.

Polarity: Indicates the polarity for the specified deadband.

Rising Edge Delay Count: Indicates an independent value for rising edge delay.

Fault Handling

Add Enable Pin:  Adds an input pin that lets you enable or disable the unit externally.

Autoreset TZx Fault Source: Allows the reset of the fault on the next cycle of the PWM.

CBC TZx Fault Source: Enables a cycle-by-cycle trip zone fault and selects the pins that are used. The PWM is put in fault mode until the next cycle.

Digital Compare: Invokes the Digital Compare set up.

EPWMA Output on fault: Specifies the A response to the fault. Your choices are:

Fault Action Disabled: No response to the fault
Forced High: Electrical conductance to 3 V
Forced Low: Electrical conductance to ground (0 V)
High Impedance: No electrical conductance on the A output

EPWMB Output on fault: Specifies the B response to the fault. Your choices are:

Fault Action Disabled: No response to the fault
Forced High: Electrical conductance to 3 V
Forced Low: Electrical conductance to ground (0 V)
High Impedance: No electrical conductance on the A output

One Shot TZx Fault Source: Enables a one-shot trip zone fault and selects the pins that are used. The PWM is put in fault mode until code is executed to bring it back up.

Time Base

Change Period Dynamically: Produces an external input pin (%Period (1.16)) that lets you specify a fractional value for the period on-the-fly. The external value will be multiplied by the period and assigned to the TBPRD (period) register. This allows you to dynamically modulate the PWM-based frequency.

Change Phase Dynamically: Produces an external input pin (%Phase (1.16)) that lets you specify a fractional value for the phase on-the-fly. The external value will be multiplied by the phase and assigned to the TBPHS (phase) register. This allows you to dynamically modulate the PWM-based frequency. To activate Change Phase Dynamically, you must also activate TBCTR=TBPHS on SYNCI pulse.

CMPA/B Load On: Selects condition to cause the CMPA/B register to be loaded.

Count Mode: Determines the counting mode. Typically, Up/Down is selected.

EPWMSYNCI Pin: Indicates the hardware pin supplying the EPWMSYNCI input pulse for unit 1.

EPWMSYNCO: Indicates the synchronizing signal sent from this unit to unit n+1.

Rate Scaling: Scales the timer source to a slower rate.

TBCTR=TBPHS on SYNCI pulse: The counter for this unit is assigned the value of the TBPHS (phase) register on occurrence of a SYNCI input pulse.

TBPHS (phase): Specifies an offset value added to the time-based counter on occurrence of the SYNCI input pulse.

Timer Period: Specifies the number of PWM clock ticks for one complete PWM waveform. The frequency of the PWM signal is determined as follows:

System-Clock-Frequency/Timer-Frequency = PWM-Frequency

For example, 150 MHz/150 = 1 MHz.