SH7261 datasheet(567/1348 Pages) RENESAS

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Section 12 Multi-Function Timer Pulse Unit 2 (MTU2)

Rev. 2.00 Sep. 07, 2007 Page 535 of 1312

REJ09B0320-0200

(1)

Example of Dead Time Compensation Setting Procedure

Figure 12.80 shows an example of dead time compensation setting procedure by using three

counters in channel 5.

TCNT_5 input capture occurs

External pulse width

measurement

Complementary PWM mode

Interrupt processing

Notes:

The PFC settings must be completed in advance.

* As an interrupt flag is set under the capture condition specified in TIOR, do not enable

interrupt requests in TIER_5.

Start count operation in

channels 3 to 5

[3]

[4] *

[5]

[1]

[2]

[1] Place channels 3 and 4 in complementary PWM mode. For details,

refer to section 12.4.8, Complementary PWM Mode.

[2] Specify the external pulse width measurement function for the target

TIOR in channel 5. For details, refer to section 12.4.10, External

Pulse Width Measurement.

[3] Set bits CST3 and CST4 in TSTR and bits CST5U, CST5V, and

CST5W in TSTR2 to 1 to start count operation.

[4] When the capture condition specified in TIOR is satisfied, the

TCNT_5 value is captured in TGR_5.

[5] For U-phase dead time compensation, when an interrupt is

generated at the crest (TGIA_3) or trough (TCIV_4) in

complementary PWM mode, read the TGRU_5 value, calculate the

difference in time in TGRB_3, and write the corrected value to

TGRD_3 in the interrupt processing.

For the V phase and W phase, read the TGRV_5 and TGRW_5

values and write the corrected values to TGRC_4 and TGRD_4,

respectively, in the same way as for U-phase compensation.

The TCNT_5 value should be cleared through the TCNTCMPCLR

setting or by software.

Figure 12.80 Example of Dead Time Compensation Setting Procedure

MTU

ch3/4

ch5

Complementary

PWM output

Dead time

delay input

Inverter output

monitor signals

Motor

≠

Figure 12.81 Example of Motor Control Circuit Configuration

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