Renesas M16C/6NK Technical Information Seite 172

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Rev.2.10 Apr 14, 2006 page 148 of 378
REJ09B0124-0210
M16C/6N Group (M16C/6NK, M16C/6NM) 14. Three-Phase Motor Control Timer Function
Figure 14.10 Sawtooth Wave Modulation Operation
Timer B2
U-phase
Sawtooth wave
Signal wave
U-Phase output
signal
(1)
U-Phase output
signal
(1)
INV14 = 0
("L" active)
Sawtooth waveform as a carrier wave
Transfer the counter to the
three-phase shift register
Rewrite registers
IDB0 and IDB1
NOTES:
1. Internal signals. See Figure 14.1 Three-Phase Motor Control Timer Functions Block Diagram.
The 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 by the timer B2 interrupt.
The above applies to INVC0 = 01XX110Xb and INVC1 = 010XXX00b (X varies depending on each system.)
INV14 = 1
("H" active)
U-phase
U-phase
U-phase
Dead time
Dead time
Timer A4 one-shot
pulse
(1)
Timer A4 start
trigger signal
(1)
INV14: Bits in the INVC1 register
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