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M32C8A Datasheet, PDF (207/372 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M32C/80 Series
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M32C/8A Group
16. Three-Phase Motor Control Timer Function
Figure 16.11 shows an example of the triangular wave modulation operation (three-phase mode 0). Figures 16.12
and 16.13 show examples of the triangular wave modulation operation (three-phase mode 1).
Triangular Waveform as a Carrier Wave (Three-phase mode 0)
Carrier wave
Signal wave
TB2S bit in the
TABSR register
Timer B2
IR bit in the TB2IC register
Set to 0 by an interrupt request acknowledgement or by program
Timer A4 start trigger signal(1)
TA4 register
a1
a2
a3
a4
a5
a6
a7
a8
a9
Reload register(1)
Timer A4 one-shot pulse(1)
Upper arm (U-phase)
output signal(1)
Lower arm (U-phase)
output signal(1)
INV14 bit in
INVC1 register = 0
(Active Low)
U-phase
U-phase
INV14 bit in
INVC1 register = 1
(Active High)
U-phase
U-phase
a1
a2
a3
a4
a5
a6
a7
a8
a9
a1
a2
a3
a4
a5
a6
a7 a8
DU0 = 1
DU1 = 0
Rewrite registers IDB0 and IDB1
DU0 = 1 DU1 = 1
Values are transferred to the three-phase output shift register from registers IDB0 and IDB1
DUB1 = 1
DUB0 = 0 DUB1 = 0
DUB0 = 0
Dead time
Dead time
NOTE:
1. Internal signals. See Three-Phase Motor Control Timer Function Block Diagram.
The above applies under the following conditions:
- INVC0 register: INV01 bit = 0 (ICTB2 counter is incremented by 1 when timer B2 underflows)
INV02 bit = 1 (Three-phase control timer function used)
INV03 bit = 1 (Three-phase control timer output enabled)
INV06 bit = 0 (Triangular wave modulation mode)
- INVC1 register: INV10 bit = 0 (Timer B2 underflow)
INV11 bit = 0 (Timers A11, A21, A41 not used (Three-phase mode 0))
INV15 bit = 0 (Dead time enabled)
INV16 bit = 1 (Rising edge of the three-phase output shift register (U-, V-, W-phase))
- ICTB2 register = 01h (Timer B2 interrupt is generated every timer B2 underflow)
The following shows examples to change PWM output levels.
- Default value of the timer: TA4 = a1 (The TA4 register is rewritten every time the timer B2 interrupt occurs.)
First time TA4 = a2, second time TA4 = a3, third time TA4 = a4, fourth time TA4 = a5, fifth time TA4 = a6
- Default value of the registers IDB0 and IDB1: DU0 = 1, DUB0 = 0, DU1 = 0, and DUB1 = 1
　　　They are changed to DU0 = 1, DUB0 = 0, DU1 = 1, and DUB1 = 0 at the sixth timer B2 interrupt.
Figure 16.11 Triangular Wave Modulation Operation (Three-Phase Mode 0)
Rev.1.00 Jul 15, 2007 Page 190 of 352
REJ09B0385-0100
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