M32C83T datasheet(193/527 Pages) RENESAS

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Page 170

15. Three-Phase Motor Control Timer Functions

)

(

TA4 Register(2)

TA41 Register(2)

Reload Register(2)

Timer A1

Reload Control Signal(1)

Triangular Wave

Signal Wave

Triangular waveform as a Carrier Wave

Timer B2

TB2S Bit in

TABSR Register

Timer A4

Start Trigger Signal

(1)

Timer A4

One-Shot Pulse

(1)

Rewrite the IDB0 and IDB1 registers

Transfer a counter

value to the three-phase

shift register

U-Phase Output

Signal

(1)

U-Phase Output

Signal

(1)

U-Phase

INV14 = 0

("L" active)

U-Phase

Dead time

INV14 = 1

("H" active)

U-Phase

NOTES:

1. Internal signals. See Figure 15.1.

2. Applies only when the INV11 bit is set to "1" (three-phase mode).

Examples of PWM output change are

(a) When INV11=1 (three-phase mode 1)

- INV01=0 and ICTB2=216 (The timer B2 interrupt is

generated with every second timer B2 underflow) or

INV01=1, INV00=1and ICTB2=116 (The timer B2 interrupt is

generated on the falling edge of the timer A1 reload control

signal)

- Default value of the timer: TA41=m, TA4=m

The TA4 and TA41 registers are changed whenever the

timer B2 interrupt is generated.

First time: TA41=n, TA4:=n.

Second time: TA41=p, TA4=p.

- Default value of the IDB0 and IDB1 registers

DU0=1, DUB0=0, DU1=0, DUB1=1

They are changed to DU0=1, DUB0=0, DU1=1, DUB1=0

by the third timer B2 interrupt.

(b) When INV11=0 (three-phase mode 0)

- INV01=0, ICTB2=116 (The timer B2 interrupt is generated

whenever the timer B2 underflows)

- Default value of the timer: TA4=m

The TA4 register is changed whenever the timer B2

interrupt is generated.

First time: TA4=m. Second time: TA4=n.

Third time: TA4=n. Fourth time: TA=p.

Fifth time: TA4=p.

- Default value of the IDB0 and IDB1 registers:

DU0=1, DUB0=0, DU1=0, DUB1=1

They are changed to DU0=1, DUB0=0, DU1=1, DUB1=0 by

the sixth timer B2 interrupt.

The above applies to INVC0 = 00XX11XX2 and INVC1 = 010XXXX02 (X varies depending on each system.)

INV00, INV01: Bits in the INVC0 register

INV11, INV14: Bits in the INVC1 register

The three-phase control timer function is available by setting the INV02 bit in the INVC0 register to "1".

The timer B2 is used for carrier wave control and timers A4, A1, A2 for three-phase PWM output (U, U, V,

___

V, W, W) control. An exclusive dead time timer controls dead time. Figure 15.8 shows an example of the

triangular modulation waveform. Figure 15.9 shows an example of the sawtooth modulation waveform.

Figure 15.8 Triangular Wave Modulation Operation

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