M16C65 Datasheet, PDF (434/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
19. Three-Phase Motor Control Timer Function
Sawtooth Waveform as a Carrier Wave
Carrier wave
Signal wave
TB2S bit
in TABSR register
Timer B2
IR bit in TB2IC register
(timer B2 interrupt request)
Timer A4
start trigger signal ⁽¹⁾
Timer A4
one-shot pulse ⁽¹⁾
U-phase output signal ⁽¹⁾
U-phase output signal ⁽¹⁾
Dead time timer output ⁽¹⁾
INV14 = 0
(Active low)
U-pin output
U-pin output
Rewrite of registers IDB0 and IDB1
The rewritten values are reflected at this point.
Dead time
INV14 = 1
(Active high)
U-pin output
U-pin output
The above applies under the following conditions.
The INVC0 register
- The INV02 bit is 1 (three-phase motor control timer function used).
- The INV03 bit is 1 (three-phase motor control timer output enabled).
- The INV06 bit is 1 (sawtooth wave modulation mode).
- The INV10 bit is 0 (Timer B2 underflow is a start trigger for timers A1, A2 and A4.).
The INVC1 register
- The INV11 bit is 0 and the ICTB2 register is 1h (Timer B interrupt request is generated at every timer B2 underflow.).
- The INV15 bit is 0 (dead time timer enabled).
- The INV16 bit is 0 (The dead time timer is triggered on the falling edge of timers A4, A1 and A2 one-shot pulse.).
The PWCOM bit in the TB2CS register is 0 (timer B2 reload at the timing of timer B2 underflow)
Bits PFC1 and PFC0 in the PFCR register are 11b (U-, U-phase outputs).
Registers IDB0 and IDB1
- Initial values : DU0 = 0, DUB0 = 1, DU1 = 1, DUB1 = 1
- The values are changed to DU0 = 1, DUB0 = 1, DU1 = 1, DUB1 = 1 at the 3rd timer B2 interrupt.
- The values are changed to DU0 = 1, DUB0 = 0, DU1 = 1, DUB1 = 1 at the 5th timer B2 interrupt.
Note:
1. Internal signal. Refer to Figure 19.1.
Figure 19.9 Usage Example of Sawtooth Wave Modulation Mode
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
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