M16C6NK Datasheet, PDF (166/404 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

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M16C/6N Group (M16C/6NK, M16C/6NM)
Sawtooth Waveform as a Carrier Wave
Sawtooth Wave
Signal Wave
14. Three-Phase Motor Control Timer Function
Timer B2
Timer A4 Start
Trigger Signal⁽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 the IDB0
and IDB1 registers
Dead time
Transfer the counter to the
three-phase shift register
INV14 = 1
("H" active)
U-Phase
U-Phase
Dead time
INV14: Bits in the INVC1 register
NOTES:
1. Internal signals. See Figure 14.1 Three-Phase Motor Control Timer Functions Block Diagram.
The above applies to INVC0 = 01XX110Xb and INVC1 = 010XXX00b (X varies depending on each system.)
The examples of PWM output change are
- Default value of the IDB0 and IDB1 registers: DU0=0, DUB0=1, DU1=1, DUB1=1
They are changed to DU0=1, DUB0=0, DU1=1, DUB1=1 by the timer B2 interrupt.
Figure 14.10 Sawtooth Wave Modulation Operation
Rev.2.00 Nov 28, 2005 page 148 of 378
REJ09B0124-0200