M32CSLASH8A datasheet(208/372 Pages) RENESAS

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M32C/8A Group

16. Three-Phase Motor Control Timer Function

Rev.1.00

Jul 15, 2007

Page 191 of 352

REJ09B0385-0100

Figure 16.12

Triangular Wave Modulation Operation (Three-Phase Mode 1)(INV01 and INV00 = 10b)

Dead time

DUB0 = 0

Triangular Waveform as a Carrier Wave (Three-phase mode 1: INV01 and INV00 = 10b)

Carrier wave

TB2S bit in the

TABSR register

Signal wave

Timer B2

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

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

INV13 bit in the INVC1 register

TA41 register

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 = 10b (ICTB2 counter is incremented by 1 at the rising 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 (Timer A11, T21, 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 (First timer B2 interrupt occurs when timer B2 underflows for the first time, and the subsequent

　　　　　　　 interrupts occur every second timer B2 underflow.)

The following shows examples to change PWM output levels.

- Default value of the timer: TA41 = b

1, TA4 = a1 (Registers TA4 and TA41 are rewritten every time the timer B2 interrupt occurs.)

　　　First time TA41 = b

2, 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.

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