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M16C/29 Group
Carrier wave: sawtooth waveform
Signal wave
Timer B2
Start trigger signal
for timer A4*
Timer A4
one-shot pulse*
U phase
output signal *
U phase
output signal *
U phase
INV14 = 0
("L" active)
U phase
U phase
INV14 = 1
("H" active)
U phase
* Internal signals. See the block diagram of the three-phase motor control timer function.
Shown here is a typical waveform for the case where INVC0= 01XX110X
system) and INVC1 = 010XXX00
• Initial values of IDB0 and IDB1 registers: DU0=0, DUB0=1, DU1=1, DUB1=1. The register values are
changed to DU0=1, DUB0=0, DU1=1, DUB1=1 a timer B2 interrupt occurs.
Figure 12.3.10. Sawtooth Wave Modulation Operation
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
Carrier wave
. An example for changing PWM outputs is shown below.
2
page 127 of 402
12.3 Three-phase Motor Control Timer Function
Rewriting IDB0, IDB1 registers
Dead time
Dead time
(X = set as suitable for the
2
Transfer to three-phase
output shift register
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