Datasheet
Digital Compare
Signals
Counter Compare
Signals
T ime Base
Signals
Dead
Band
(DB)
Counter
Compare
(CC)
Action
Qualifier
(AQ)
EPWMxA
EPWMxB
CTR = CMPB
CTR = 0
EPWMxINT
EPWMxSOCA
EPWMxSOCB
EPWMxA
EPWMxB
nTZ1 to nTZ3
CTR = CMPA
T ime-Base
(TB)
CTR = PRD
CTR = 0
CTR_Dir
EPWMxSYNCI
EPWMxSYNCO
EPWMxTZINT
PWM-
chopper
(PC)
Event
Trigger
and
Interrupt
(ET)
Trip
Zone
(TZ)
GPIO
MUX
ADC
VIM
Digital
Compare
(DC)
CPU Debug Mode
OSCFAIL or PLL SLip
Combination of EQEP1ERR
and EQEP2ERR
Digital Compare
Signals
Digital Compare
Signals
VIM
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ePWM Submodules
34.2.5 Dead-Band Generator (DB) Submodule
Figure 34-27 illustrates the dead-band submodule within the ePWM module.
Figure 34-27. Dead_Band Submodule
34.2.5.1 Purpose of the Dead-Band Submodule
The "Action-qualifier (AQ) Module" section discussed how it is possible to generate the required dead-
band by having full control over edge placement using both the CMPA and CMPB resources of the ePWM
module. However, if the more classical edge delay-based dead-band with polarity control is required, then
the dead-band submodule described here should be used.
The key functions of the dead-band module are:
• Generating appropriate signal pairs (EPWMxA and EPWMxB) with dead-band relationship from a
single EPWMxA input
• Programming signal pairs for:
– Active high (AH)
– Active low (AL)
– Active high complementary (AHC)
– Active low complementary (ALC)
• Adding programmable delay to rising edges (RED)
• Adding programmable delay to falling edges (FED)
• Can be totally bypassed from the signal path (note dotted lines in diagram)
34.2.5.2 Controlling and Monitoring the Dead-Band Submodule
The dead-band submodule operation is controlled and monitored via the following registers:
Table 34-13. Dead-Band Generator Submodule Registers
Register Name Address Offset Shadowed Description
DBCTL 1Eh No Dead-Band Control Register
DBFED 22h No Dead-Band Falling Edge Delay Count Register
DBRED 20h No Dead-Band Rising Edge Delay Count Register
1745
SPNU562–May 2014 Enhanced Pulse Width Modulator (ePWM) Module
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