Z
P
Z
P
TBCNT
EPWMxA
EPWMxB
CA
CA
CB
CB
Enhanced PWM (ePWM) Module
and
contains initialization and runtime register configurations for the waveforms
in
. Use the code in
to define the headers.
Figure 15-32. Up-Down-Count, Dual Edge Asymmetric Waveform, With Independent Modulation on
EPWMxA—Active Low
(1)
PWM period = 2 × TBPRD × TBCLK
(2)
Rising edge and falling edge can be asymmetrically positioned within a PWM cycle. This allows for pulse
placement techniques.
(3)
Duty modulation for EPWMxA is set by CMPA and CMPB.
(4)
Low time duty for EPWMxA is proportional to (CMPA + CMPB).
(5)
To change this example to active high, CMPA and CMPB actions need to be inverted (i.e., Set ! Clear and
Clear Set).
(6)
Duty modulation for EPWMxB is fixed at 50% (utilizes spare action resources for EPWMxB)
1532Pulse-Width Modulation Subsystem (PWMSS)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated