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ePWM Submodules

Example 34-7. Trip-Zone Configurations

Scenario A:

A one-shot trip event on TZ1 pulls both EPWM1A, EPWM1B low and also forces EPWM2A and EPWM2B

high.

• Configure the ePWM1 registers as follows:

– TZSEL[OSHT1] = 1: enables TZ1 as a one-shot event source for ePWM1

– TZCTL[TZA] = 2: EPWM1A will be forced low on a trip event.

– TZCTL[TZB] = 2: EPWM1B will be forced low on a trip event.

• Configure the ePWM2 registers as follows:

– TZSEL[OSHT1] = 1: enables TZ1 as a one-shot event source for ePWM2

– TZCTL[TZA] = 1: EPWM2A will be forced high on a trip event.

– TZCTL[TZB] = 1: EPWM2B will be forced high on a trip event.

Scenario B:

A cycle-by-cycle event on TZ5 pulls both EPWM1A, EPWM1B low.

A one-shot event on TZ1 or TZ6 puts EPWM2A into a high impedance state.

• Configure the ePWM1 registers as follows:

– TZSEL[CBC5] = 1: enables TZ5 as a one-shot event source for ePWM1

– TZCTL[TZA] = 2: EPWM1A will be forced low on a trip event.

– TZCTL[TZB] = 2: EPWM1B will be forced low on a trip event.

• Configure the ePWM2 registers as follows:

– TZSEL[OSHT1] = 1: enables TZ1 as a one-shot event source for ePWM2

– TZSEL[OSHT6] = 1: enables TZ6 as a one-shot event source for ePWM2

– TZCTL[TZA] = 0: EPWM2A will be put into a high-impedance state on a trip event.

– TZCTL[TZB] = 3: EPWM2B will ignore the trip event.

1757

SPNU562–May 2014 Enhanced Pulse Width Modulator (ePWM) Module

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