Renesas RX100 Series User Manual page 432

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(g) PWM Period Setting

In complementary PWM mode, the PWM period is set in two registers—MTU3.TGRA, in which the MTU3.TCNT

upper limit value is set, and TCDRA, in which the MTU4.TCNT upper limit value is set. The settings should be made so

as to achieve the following relationship between these two registers:

With dead time: MTU3.TGRA setting = TCDRA setting + TDDRA setting

Without dead time: MTU3.TGRA setting = TCDRA setting + 1

In addition, the settings should be made so as to achieve the following relationship between the TCDRA register and the

TDDRA register:

TCDRA setting > TDDRA setting × 2 + 2

The MTU3.TGRA and TCDRA settings are made by setting values in buffer registers MTU3.TGRC and TCBRA. When

data is written to MTU4.TGRD to enable transfers, the values set in MTU3.TGRC and TCBRA are transferred

simultaneously to the MTU3.TGRA and TCDRA with the transfer timing selected with the MTU3.TMDR1.MD[3:0]

The new PWM period is reflected from the next cycle when data is updated at the crest, or from the current cycle when

updated in the trough. Figure 19.49 illustrates the operation when the PWM period is updated at the crest.

Refer to the following section, (h), Register Data Updating , for the method of updating the data in each buffer register.

Counter value

Figure 19.49

Example of PWM Period Updating (MTU3 and MTU4)

R01UH0822EJ0100 Rev.1.00

Jul 31, 2019

19. Multi-Function Timer Pulse Unit 3 (MTU3c)

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