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R01UH0823EJ0100 Rev.1.00 Page 530 of 1823

Jul 31, 2019

RX23W Group 23. Multi-Function Timer Pulse Unit 2 (MTU2a)

(3) Selecting Timing for Transfer from Buffer Registers to Timer General Registers in Buffer

Operation

The timing for transfer from buffer registers to timer general registers can be selected in PWM mode 1 or 2 for MTU0 or

in PWM mode 1 for MTU3 and MTU4 by setting the timer buffer operation transfer mode registers (MTU0.TBTM,

MTU3.TBTM, and MTU4.TBTM). Either compare match (initial setting) or TCNT clearing can be selected for the

transfer timing. TCNT clearing as transfer timing is one of the following cases.

 When the TCNT counter overflows (FFFFh → 0000h)

 When 0000h is written to the TCNT counter during counting

 When the TCNT counter is set to 0000h under the condition specified in the TCR.CCLR[2:0] bits

Note: The TBTM register must be modified only while the TCNT counter stops.

Figure 23.19 shows an operation example in which PWM mode 1 is designated for MTU0 and buffer operation is

designated for registers MTU0.TGRA and MTU0.TGRC. The settings used in this example are MTU0.TCNT clearing

by compare match B, high output at compare match A, and low output at compare match B. The MTU0.TBTM.TTSA bit

is set to 1.

Figure 23.19 Example of Buffer Operation When MTU0.TCNT Clearing is Selected for

MTU0.TGRC-to-MTU0.TGRA Transfer Timing

Time

0520h

0450h

0200h

0520h0450h0200h

0200h

Transfer

MTU0.TCNT value

0000h

MTIOC0A

MTU0.TGRA

MTU0.TGRC

MTU0.TGRB

MTU0.TGRA

Renesas RX Series User Manual

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