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Mini57
Apr. 06, 2017
Page 239 of 475
Rev.1.00
MINI5
7
S
E
RI
E
S
TECH
NIC
A
L R
E
F
E
RE
N
CE
MA
N
UA
L
EPWM0_CH0 without
dead-time
EPWM0_CH1 without
dead-time
EPWM0_CH0 with
dead-time
EPWM0_CH1 with
dead-time
Dead-time Interval
Effect of dead-time for complementary pairs
Figure 6.8-17 EPWM Dead-time Insertion
6.8.5.7
Group Mode
Group mode is enabled when GROUPEN (EPWM_CTL[30]) = 1.
This device supports Group mode control which allows all even PWM channels output to be duty
controllable by EPWM_CH0 duty register.
If GROUPEN = 1, both (EPWM_CH2, EPWM_CH3) and (EPWM_CH4, EPWM_CH5) pairs will
follow (EPWM_CH0, EPWM_CH1), which imply;
EPWM_CH4 = EPWM_CH2 = EPWM_CH0;
EPWM_CH5 = EPWM_CH3 = EPWM_CH1 = invert (EPWM_CH0) if Complementary mode is
enabled when MODE (EPWM_CTL[29:28]) = 01.
Note:
For applications, please do not use Group and Synchronous mode simultaneously because
the Synchronous mode will be inactive.
6.8.5.8
Asymmetric Mode
Asymmetric mode only works under Center-aligned type. Asymmetric mode is enabled when
ASYMEN (EPWM_CTL[20]) = 1. In this mode EPWM counter will compare with another
compared value CMPU (EPWM_CMPDATn[31:16]) when counting up. If CMPU is not equal to
the
CMP,
the
EPWM
will
generate
asymmetric
waveform
and
set
CMPUIFn
(EPWM_INTSTS[13:8]) of the corresponding channel n.
PERIOD (7FF)
CMP (2AA)
PWM Period
EPWM_CHn
output
CMPUIFn
software
clear
CMPU (555)
PWM Period
software
clear
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