M16CSLASH29 datasheet(158/499 Pages) RENESAS

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12. Timer (Three-phase Motor Control Timer Function)

page 134

Figure 12.33 Triangular Wave Modulation Operation

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

When this function is on, timer B2 is used to control the carrier wave, and timers A4, A1 and A2 are used to

___

control three-phase PWM outputs (U, U, V, V, W and W). The dead time is controlled by a dedicated dead-

time timer. Figure 12.33 shows the example of triangular modulation waveform, and Figure 12.34 shows

the example of sawtooth modulation waveform.

Start trigger signal

for timer A4(1)

Timer B2

U phase

Triangular wave

Signal wave

U phase

output signal (1)

U phase

INV14 = 0

Triangular waveform as a Carrier Wave

Timer A4

one-shot pulse(1)

INV14 = 1

Dead time

Rewrite registers IDB0 and IDB1

NOTE:

1. Internal signals. See Figure 12.25.

Examples of PWM output change are:

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

· INV01 = 0 and ICTB2 = 216 (the timer B2 interrupt is generated

every two times the timer B2 underflows),

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

generated at the falling edge of the timer A1 reload control signal.)

· Default value of the timer: TA41 = m, TA4 = m.

Registers TA4 and TA41 are changed whenever the timer B2

interrupt is generated.

First time, TA41 = n, TA4 = n. Second time, TA41 = p, TA4 = p.

· Default values of registers IDB0 and IDB1:

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

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

when the third timer B2 interrupt is generated.

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

· INV01 = 0, ICTB2 = 116 (the timer B2 interrupt is generated

whenever 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 tim:, TA4 = n.

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

Fifth time: TA4 = p.

· Default values of registers IDB0 and IDB1:

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

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

when the sixth timer B2 interrupt is generated.

TB2S bit in the

TABSR register

INV13

(INV11=1(three-phase

mode 1))

The above applies under the following conditions:

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

U phase

output signal (1)

(“L” active)

(“H” active)

The value written to registers TA4 and TA41 becomes effective at the rising edge of the timer A1 reload control signal.

Transfer the values

to the three-phase

output shift register

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