0
1
S2
1
0 S1
RED
Out
In
Rising edge
delay
(10-bit
counter)
(10-bit
counter)
delay
Falling edge
In
Out
FED
1
0 S3
0
S0
1
EPWMxA
EPWMxB
DBCTL[POLSEL]
DBCTL[OUT_MODE]
S5
DBCTL[IN_MODE]
1
0
S4
0
1
EPWMxA in
EPWMxB in
Enhanced PWM (ePWM) Module
15.2.2.6.3 Operational Highlights for the Dead-Band Generator Submodule
The following sections provide the operational highlights.
The dead-band submodule has two groups of independent selection options as shown in
•
Input Source Selection: The input signals to the dead-band module are the EPWMxA and EPWMxB
output signals from the action-qualifier. In this section they will be referred to as EPWMxA In and
EPWMxB In. Using the DBCTL[IN_MODE) control bits, the signal source for each delay, falling-edge or
rising-edge, can be selected:
–
EPWMxA In is the source for both falling-edge and rising-edge delay. This is the default mode.
–
EPWMxA In is the source for falling-edge delay, EPWMxB In is the source for rising-edge delay.
–
EPWMxA In is the source for rising edge delay, EPWMxB In is the source for falling-edge delay.
–
EPWMxB In is the source for both falling-edge and rising-edge delay.
•
Output Mode Control: The output mode is configured by way of the DBCTL[OUT_MODE] bits. These
bits determine if the falling-edge delay, rising-edge delay, neither, or both are applied to the input
signals.
•
Polarity Control: The polarity control (DBCTL[POLSEL]) allows you to specify whether the rising-edge
delayed signal and/or the falling-edge delayed signal is to be inverted before being sent out of the
dead-band submodule.
Figure 15-34. Configuration Options for the Dead-Band Generator Submodule
1535
SPRUH73H – October 2011 – Revised April 2013
Pulse-Width Modulation Subsystem (PWMSS)
Copyright © 2011–2013, Texas Instruments Incorporated