Renesas RX100 Series User Manual page 398

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

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 buffer operation transfer mode registers (MTUn.TBTM (n = 0, 3,

4)). Either compare match (value after reset) or TCNT clearing can be selected for the transfer timing. TCNT clearing as

transfer timing is one of the following cases.

 When TCNT overflows (FFFFh to 0000h)

 When 0000h is written to TCNT during counting

 When TCNT becomes 0000h under the condition specified in the CCLR[2:0] bits in TCR

TBTM must be modified only while TCNT stops.

Figure 19.19 shows an operation example in which PWM mode 1 is designated for MTU0 and buffer operation is

designated for 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 TTSA bit in MTU0.TBTM

is set to 1.

MTU0.TCNT value

Figure 19.19

Example of Buffer Operation When MTU0.TCNT Clearing is Selected for MTU0.TGRC to

MTU0.TGRA Transfer Timing

R01UH0822EJ0100 Rev.1.00

Jul 31, 2019

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

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