M16C29 Datasheet, PDF (159/499 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/Tiny SERIES

M16C/29 Group
Sawtooth Waveform as a Carrier Wave
Sawtooth wave
Signal wave
12. Timer (Three-phase Motor Control Timer Function)
Timer B2
Start trigger signal
for timer A4⁽¹⁾
Timer A4
one-shot pulse⁽¹⁾
U phase
output signal ⁽¹⁾
U phase
output signal ⁽¹⁾
INV14 = 0
(“L” active)
U phase
U phase
Rewrite registers
IDB0 and IDB1
Transfer the values to the three-
phase output shift register
Dead time
INV14 = 1
(“H” active)
U phase
U phase
Dead time
NOTE:
1. Internal signals. See Figure 12.25.
The above applies under the following conditions:
INVC0 = 01XX110X2 (X varies depending on each system) and INVC1 = 010XXX002.
Examples of PWM output change are:
• Default value of registers IDB0 and IDB1: DU0=0, DUB0=1, DU1=1, DUB1=1.
They are changed to DU0=1, DUB0=0, DU1=1, DUB1=1 when the timer B2 interrupt is generated.
Figure 12.34 Sawtooth Wave Modulation Operation
Rev. 1.12 Mar.30, 2007 ^{page 135} of 458
REJ09B0101-0112