M32CSLASH8A datasheet(207/372 Pages) RENESAS

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M32C/8A Group

16. Three-Phase Motor Control Timer Function

Rev.1.00

Jul 15, 2007

Page 190 of 352

REJ09B0385-0100

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).

Figure 16.11

Triangular Wave Modulation Operation (Three-Phase Mode 0)

Dead time

DUB0 = 0

Triangular Waveform as a Carrier Wave (Three-phase mode 0)

Carrier wave

TB2S bit in the

TABSR register

Signal wave

Timer B2

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)

Timer A4 start trigger signal(1)

TA4 register

Reload register(1)

Timer A4 one-shot pulse(1)

INV14 bit in

INVC1 register = 0

(Active Low)

Dead time

Values are transferred to the three-phase output shift register from registers IDB0 and IDB1

Rewrite registers IDB0 and IDB1

Upper arm (U-phase)

output signal(1)

Lower arm (U-phase)

output signal(1)

U-phase

INV14 bit in

INVC1 register = 1

(Active High)

U-phase

IR bit in the TB2IC register

The following shows examples to change PWM output levels.

- Default value of the timer: TA4 = a

1 (The TA4 register is rewritten every time the timer B2 interrupt occurs.)

First time TA4 = a

2, 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.

DU0 = 1

DU1 = 0

DUB1 = 1

DUB1 = 0

DUB0 = 0

DU0 = 1

DU1 = 1

Set to 0 by an interrupt request acknowledgement or by program

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