M16C26A Datasheet, PDF (144/352 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/26A Group (M16C/26A, M16C/26B, M16C/26T)
Carrier wave: sawtooth waveform
Carrier wave
Signal wave
12. Timer
Timer B2
Start trigger signal
for timer A4*
Timer A4
one-shot pulse*
U phase
output signal *
U phase
output signal *
INV14 = 0
(“L” active)
U phase
U phase
Rewriting IDB0, IDB1 registers
Transfer to three-phase
output shift register
Dead time
INV14 = 1
(“H” active)
U phase
U phase
Dead time
* 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= 01XX110X2 (X = set as suitable for the
system) and INVC1 = 010XXX002. An example for changing PWM outputs is shown below.
• 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. 2.00 Feb.15, 2007 ^{page 127} of 329
REJ09B0202-0200