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M32C8A Datasheet, PDF (209/372 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
Triangular Waveform as a Carrier Wave (Three-phase mode 1: INV0 and INV00 = 11b)
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
INV13 bit in the INVC1 register
Timer A4 start trigger signal(1)
TA4 register
TA41 register
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
b1
b2
b3
b4
b5
b1
a1
b1 b2
a2
b2 b3
a3
b3 b4
a4
b4 b5
b1
a1
b2
a2
b3
a3
b4 a4
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: Bits INV01 and INV00 = 11b (ICTB2 counter is incremented by 1 at the falling edge of the timer A1 reload control signal)
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 = 1 (Timers A11, A21, A41 used (Three-phase mode 1))
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 (Every second timer B2 underflow.)
(ICTB2 register = 02h, if INV01 bit = 0)
The following shows examples to change PWM output levels.
- Default value of the timer: TA41 = b1, TA4 = a1 (Registers TA4 and TA41 are rewritten every time the timer B2 interrupt occurs.)
　　　First time TA41 = b2, TA4 = a2, second time TA41 = b3, TA4 = a3
- 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 third timer B2 interrupt.
Figure 16.13 Triangular Wave Modulation Operation (Three-Phase Mode 1)(INV01 and INV00 = 11b)
Rev.1.00 Jul 15, 2007 Page 192 of 352
REJ09B0385-0100
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