Specifications

PWM Circuits Associated With Compare Units
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6.5 PWM Circuits Associated With Compare Units
The PWM circuits associated with compare units make it possible to generate
six PWM output channels (per EV) with programmable dead-band and output
polarity. The EVA PWM circuits functional block diagram is shown in
Figure 6–17. It includes the following functional units:
- Asymmetric/Symmetric Waveform Generators
- Programmable Dead-Band Unit (DBU)
- Output Logic
- Space Vector (SV) PWM State Machine
The EVB PWM circuits functional block diagram is identical to that of the EVA’s,
with the corresponding change of configuration registers.
The asymmetric/symmetric waveform generators are the same as those of the
GP timers. The dead-band units and output logic are discussed in sec-
tions 6.5.2 and 6.5.3, respectively. The space vector PWM state machine and
the space vector PWM technique are described later in this chapter.
Figure 6–17. PWM Circuits Block Diagram
COMCONA[11–13]
Sym/asym
waveform
generator
Compare
matches
GPT1 flags
SVPWM
state
machine
ACTRA[12–15]
COMCONA[12]
MUX
Dead
band
units
DBTCONA
dead-band
timer control
register
Output
logic
ACTRA
full compare
action control
register
COMCONA[9]
PWM1
PWM6
PHx
x=1,2,3
DTPHx
DTPHx_