R5F72115D160FPV datasheet(554/1228 Pages) RENESAS

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Section 10 Multi-Function Timer Pulse Unit 2 (MTU2)

Rev. 2.00 May. 08, 2008 Page 530 of 1200

REJ09B0344-0200

(1)

Example of Dead Time Compensation Setting Procedure

Figure 10.90 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

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 10.4.8, Complementary PWM Mode.

[2] Specify the external pulse width measurement function for

the target TIOR in channel 5. For details, refer to section

10.4.11, 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.

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.

Figure 10.90 Example of Dead Time Compensation Setting Procedure

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