M32CSLASH8A datasheet(209/372 Pages) RENESAS

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M32C/8A Group

16. Three-Phase Motor Control Timer Function

Rev.1.00

Jul 15, 2007

Page 192 of 352

REJ09B0385-0100

Figure 16.13

Triangular Wave Modulation Operation (Three-Phase Mode 1)(INV01 and INV00 = 11b)

Dead time

DUB0 = 0

Triangular Waveform as a Carrier Wave (Three-phase mode 1: INV0 and INV00 = 11b)

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 = 11b (ICTB2 counter is incremented by 1 at the falling 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 (Timers A11, A21, 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 (Every second timer B2 underflow.)

(ICTB2 register = 02h, if INV01 bit = 0)

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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