Texas Instruments 28xxx User Manual

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Generate
interrupt
pulsewhen
input=1
Clear
Set
TZCLR[INT]
EPWMx_TZINT
(PIE)
Latch
Clear
Set
Clear
Set
Latch
Latch
TZFLG[CBC]
TZFLG[OST]
TZEINT[CBC]
TZCLR[CBC]
CBC
tripevent
TZEINT[OST]
OSHT
tripevent
TZCLR[OST]
TZFLG[INT]
2.8 Event-Trigger (ET) Submodule
CTR=CMPB
CTR=CMPA
CTR_Dir
CTR=0
CTR=PRD
Dead
Band
(DB)
Counter
Compare
(CC)
Action
Qualifier
(AQ)
EPWMA
EPWMB
CTR=CMPB
CTR=0
EPWMxINT
EPWMxSOCA
EPWMxSOCB
EPWMxA
EPWMxB
TZ1
toTZ6
CTR=CMPA
Time-Base
(TB)
CTR=PRD
CTR=0
CTR_Dir
EPWMxSYNCI
EPWMxSYNCO
EPWMxTZINT
PWM-
chopper
(PC)
Event
Trigger
and
Interrupt
(ET)
Trip
Zone
(TZ)
Event-Trigger (ET) Submodule
Figure 2-37. Trip-Zone Submodule Interrupt Logic
The key functions of the event-trigger submodule are:
• Receives event inputs generated by the time-base and counter-compare submodules
• Uses the time-base direction information for up/down event qualification
• Uses prescaling logic to issue interrupt requests and ADC start of conversion at:
– Every event
– Every second event
– Every third event
• Provides full visibility of event generation via event counters and flags
• Allows software forcing of Interrupts and ADC start of conversion
The event-trigger submodule manages the events generated by the time-base submodule and the
counter-compare submodule to generate an interrupt to the CPU and/or a start of conversion pulse to the
ADC when a selected event occurs. Figure 2-38 illustrates where the event-trigger submodule fits within
the ePWM system.
Figure 2-38. Event-Trigger Submodule
SPRU791D – November 2004 – Revised October 2007 ePWM Submodules 63
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Texas Instruments 28xxx Specifications

General

Brand	Texas Instruments
Model	28xxx
Category	Accessories
Language	English